Currently, by default, integral curves are repeatedly re-computed in different flow visualization applications, such as FTLE field computation, source-destination queries, etc., leading to unnecessary resource cost. We present a compression-based data reuse framework for integral curves, to greatly reduce their retrieval cost, especially in a resource-limited environment. In our design, a hierarchical and hybrid compression scheme is proposed to balance three objectives, including high compression ratio, controllable error, and low decompression cost. Specifically, we use and combine digitized curve sparse representation, floating-point data compression, and octree space partitioning to adaptively achieve the objectives. Results have shown that our data reuse framework could acquire tens of times acceleration in the resource-limited environment compared to on-the-fly particle tracing, and keep controllable information loss. Moreover, our method could provide fast integral curve retrieval for more complex data, such as unstructured mesh data.

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1155/2019/5231839

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1145/3231622.3232504

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1007/978-3-030-00560-3_2

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s12650-017-0428-4

Other Link： http://dx.doi.org/10.1007/s12650-017-0428-4

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1080/10618562.2016.1234046

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1016/j.imavis.2024.105056

Language：English   Publishing type：Research paper (international conference proceedings)  

Other Link： https://link.springer.com/chapter/10.1007/978-981-99-9470-0_23

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： https://doi.org/10.1145/3640900.3640903

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/BIBM58861.2023.10385370

Scopus

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/TVCG.2022.3214821

Web of Science

Scopus

PubMed

Language：Japanese  

In the current project, the first author and the second author play a central role in conducting high-speed tuning and wind turbine wake analysis of the supercomputer version of RIAM-COMPACT. In this report, we applied the supercomputer version RIAM-COMPACT to the wind turbine wake simulation from the wind tunnel scale to the utility-scale wind turbine wakes. As a result, we clarified unsteady wake aerodynamics of wind turbines including multiple wake interactions with high precision and high reality.

CiNii Research

Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

DOI： 10.1299/jsmebiofro.2022.33.1d07

CiNii Research

Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

<p>A hemispheric-head cyclone separator has higher collection performance of fine particles comparing with a conventional cyclone separator with a cylindrical head. In order to optimize the shape model with hemispheric-head, we have investigated numerically and experimentally the air flow in various shape cyclone models for industrials. The purpose of this study is to develop a cyclone model for fuel cell vehicles based on the results for industrials. Since this model is installed in a fuel cell vehicle, it must be compact due to space constraints. Therefore, as the first stage of development, based on a model of a dome-shaped cyclone separator with a cyclone diameter of 54 mm, we numerically investigated the airflow in the model by changing the dust holder size and the inlet pipe connection height. The motion of fine particles was analyzed considering only drag and gravity, and the effect of internal airflow on collection performance was investigated. As a result, it is shown that the model with the low inlet pipe connection height and the small volume of the dust holder has the highest collection efficiency. It was found that even if the entry particles in the dust holder return to the conical separator part due to small dust holder, the air flow field of the highest collection efficiency model has high centrifugal separation performance by lowering the connection height of inlet pipe. It is also the most suitable in terms of space for installation in fuel cell vehicles.</p>

DOI： 10.1299/jsmefed.2022.os04-18

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (other academic)  

DOI： 10.1109/PacificVis48177.2020.6431

Language：English   Publishing type：Research paper (other academic)  

DOI： 10.1007/978-3-030-30949-7_13

Language：Japanese   Publishing type：Research paper (other academic)  

DOI： 10.1299/jsmebio.2019.31.1G22

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1080/10255842.2018.1555584

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (other academic)  

DOI： 10.1007/978-3-030-30284-9_6

Language：Japanese   Publishing type：Research paper (scientific journal)  

The cars are classified by cars' body types. However the characteristics are basically similar at first sight, so it is difficult to distinguish the differences among those cars' body types. Therefore, in this study, we considered that cars' characteristics could be analyzed by using deep learning and image recognition technology, developed a system to visualize the judgment and characteristic parts of cars' body types. Specifically, we made renderings of the CG model of 30 cars by setting 360 viewpoints in 1 degree increments around each car. Deep learning was performed using these 2D images as teacher signals. The car body type recognition probability of each angle is graphed, and the characteristic parts of each car body type are visualized. As a result, we clarified the visual angles and the pars contributing the judgment of cars' body types.

DOI： 10.5057/jjske.TJSKE-D-18-00039

Language：English   Publishing type：Research paper (other academic)  

DOI： 10.1109/CANDARW.2018.00053

Language：English   Publishing type：Research paper (other academic)  

DOI： 10.1109/ISCC.2018.8538488

Language：English   Publishing type：Research paper (other academic)  

DOI： 10.1109/LDAV.2018.8739214

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.future.2017.02.011

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1142/S1793962318400068

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1142/S1793962318400068

Language：English   Publishing type：Research paper (other academic)  

DOI： 10.1007/978-3-030-02465-9_17

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.11239/jsmbe.56.37

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s12650-017-0428-4

Language：Japanese   Publishing type：Research paper (scientific journal)  

In the plan of the products, affective information is utilized with diversification of a life style. Then, in this research, we developed the system that visualizes the difference in affective layered structures of two liquors' reviews (hereafter, visualization system). Specifically, the development consists of the following steps. (1) The visualization system extracts affective words from the reviews on the web. (2) We create the decision table in rough set theory using affective words. (3) The visualization system visualizes the difference in affective layered structures of two liquors using decision rules from each decision table. We conducted the evaluation experiment of the visualization system for 10 subjects. We made five subjects summarize comparison results of two liquors' reviews using the visualization system, and made remaining five subjects summarize them without it. Consequently, the usefulness of the visualization system was verified from the summarized contents and the creation time of them.

DOI： 10.5057/jjske.TJSKE-D-17-00052

Language：Japanese   Publishing type：Research paper (other academic)  

Repository Public URL： http://hdl.handle.net/2324/1916268

Language：English   Publishing type：Research paper (international conference proceedings)  

Other Link： http://eprints.whiterose.ac.uk/114659/

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.5057/jjske.TJSKE-D-16-00057

Language：Japanese   Publishing type：Research paper (scientific journal)  

In the plan of products, affective information is increasingly utilized with diversi cation of a life style. Then, in this research, we had developed the system that visualizes the affective layered structures of liquors’ reviews using rough set theory (hereafter, visualization system). Speci cally, the development consists of the following steps. (1) The visualization system extracts affective words from the reviews of mail order sites. (2) We create the decision table in rough set theory using affective words. (3) We visualize the affective layered structure using the computed decision rules from decision table. We conducted the evaluation experiment of the visualization system for 20 subjects. We made ten subjects the summary of liquor reviews using the visualization system, and made the remaining ten subjects the summary of them without the visualization system. Consequently, the usefulness of the visualization system was veri ed from the contents and the time for creation of the summary.

DOI： 10.5057/jjske.TJSKE-D-16-00057

Language：Japanese   Publishing type：Research paper (other academic)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Nasal air flow and temperature were analyzed using a voxel model constructed directly from medical images. The nasal cavities of a healthy male were reconstructed using CT slices in the axial direction at an image resolution of 0.488 mm/pixel and a slice interval of 0.40 mm. The rough surfaces in the image, which were caused by the resolution, were smoothed using a bilinear interpolation algorithm. A voxel-based simulation of inspiratory flow was then performed with a voxel pitch of 0.20 mm. With an interpolation image resolution of 0.163 mm//pixel, the voxel model successfully simulated an overall pressure drop and airflow temperature to the same extent as the conventional boundary-fitted model.

DOI： 10.11239/jsmbe.53.160

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.15748/jasse.2.108

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

This study describes a new approach to provide detailed quantification of the impact of surgical intervention on bilateral nasal airflow using voxel-based simulation. Computed tomography and magnetic resonance imaging scans were used to reconstruct 3D realistic models of both the pre- and post-operative nasal airways. Voxel-based simulation of quiet restful inspiratory flow was then performed using meshes of varying refinement to determine the level of mesh refinement required to adequately resolve the flow and heat transfer. For meshes with voxel pitches of 0.10 mm, the voxel model successfully simulated the overall pressure drop and airflow temperatures.

DOI： 10.11239/jsmbe.52.33

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.procs.2014.08.228

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.procs.2014.05.218

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.compfluid.2012.04.024

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/SC.Companion.2012.371

Language：Japanese   Publishing type：Research paper (scientific journal)  

シミュレーションの目的の一つとして、工業製品の設計支援がある。従来よりシミュレータ自身の開発・高精度化・高速化の点から様々な研究開発が行われ、シミュレーションの実行に関してプリポスト技術も進展してきた。近年、計算機のアーキテクチャが超並列によって性能向上を図る方向へ進み、シミュレータも超並列を考慮したアプリケーションの設計とチューニングの対応が必須となっている。この超並列化は、シミュレータ以上に周辺技術に大きく影響を与え、超並列対応のプリポスト技術の要請が高まっている。また、今後利用可能な巨大な計算機資源をどのように設計に活かすのか、シミュレーションの利用形態も大きく変化しようとしている。これらの動向を踏まえ、今後のシミュレーション環境を見据えた基盤技術について報告する。

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

  Visualization has great importance to extract essentials included in simulation data and to derive scientific discovery from the analyzed data. However, only perfurming simulation is not sufficient. Post processing, that is visualization and data analysis, is recognized as the very important basic technology that supports numerical simulation. Recently, K computer achieved the world fastest record in TOP500 and is anticipated its utilization in science and engineering fields. Extremely high parallelism and computation performance will be required for data processing and visualization algorithms since the high-end parallel supercomputer generates large-scale datasets. This paper describes the trend of post processing technology, which becomes more and more important.

DOI： 10.3154/jvs.32.125_2

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Others   Publishing type：Research paper (scientific journal)  

A fluid solver using signed distance function (SDF) for shape representation was developed based on the immersed boundary method to simulate incompressible viscous flows. The forcing velocities near boundary are extrapolated by trilinear interpolation with taking into account a boundary condition using SDF. SMAC method is employed for solving basic equations for unsteady incompressible flows. The equations are discretized in space by 2nd-order central difference method, where the discretization near boundary is improved by SDF to satisfy a Dirichlet boundary condition for velocity. The fluid solver was verified in both steady and oscillating three-dimensional Poiseuille flows. As the grid spacing decreases, L² and L^∞ norm of the error of the axial velocity profile respectively decrease by the order of 1.96 and 1.89 for the oscillating flow. Therefore, the fluid solver enables to analyze the Poiseuille flow using Cartesian mesh by 2nd-order of accuracy in space.

DOI： 10.1299/kikaib.77.1813

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (other academic)  

鼻腔は非常に複雑な形状をしており，吸入した空気を適切な温度に加温・冷却する温度調節機能などの重要な機能を保持している．従来の鼻腔内流れの熱流体解析では非構造格子と境界適合格子を用いた解析モデルが多く用いられているが，格子生成に多大なコストがかかるため，ボクセル格子法の適用が検討されている．本研究では鼻腔の温度調節機能に着目し，医療画像より再構築したボクセル格子モデルを用いて鼻腔内流れの熱流体解析を行った．

DOI： 10.11368/nhts.2011.0.253.0

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (other academic)  

We have proposed an Eulerian mesh-based scheme using the level set function to analyze large-deformation fluid-structure interaction (FSI) problems. In this scheme, we introduce an interface treatment technique using virtual particles with the level sets and structural velocity components in order to enforce the kinematic condition at the interface on a fluid fixed mesh. In this study, we address problems where the boundary layer is relatively thin, such as coupled problems of external flow and a submerged elastic structure, for which it is necessary to consider adaptive mesh refinement (AMR) near the fluid-structure interface. We show the algebraic performance and numerical results compared with the ALE (Arbitrary Lagrangian-Eulerian) mesh-based scheme.

DOI： 10.11345/japannctam.59.0.52.0

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/fld.2470

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/fld.2467

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

A useful computational method was proposed for an incompressible viscous flow simulation around arbitrary geometries on a Cartesian grid system. This method has a remarkable feature that allows us to simulate the flow around geometries which are composed of non-watertight and incomplete polygon elements without any repair. The proposed method can reduce manpower drastically in the process of the mesh generation because the repair of the defective polygon elements can be eliminated. In this method, governing equations are discretized using the extrapolated velocity to satisfy the no-slip condition on the wall surface taking into account the distance between the polygons and the cell center on the Cartesian grid. Moreover, this approach has a higher accuracy of shape approximation compared with the voxel method. In this paper, four different cases were calculated to validate the proposed method. Firstly, the flow around an inclined plate thinner than the mesh size was calculated to show that this method can simulate the flow around the non-watertight geometry. Additionally, in this case, the accuracy of shape approximation was compared between the proposed method and the voxel method. Sencondly and thirdly, flows around a circular cylinder (Re=40, 100) were calculated to confirm the accuracy of solutions in the steady and unsteady flows. Finally, an internal flow in a curved duct was calculated to compare the solutions with other researcher's results including the experiment. Consequently, it was found that the proposed method could simulate the flow around the non-watertight geometry and this method had the reasonably good accuracy compared with the literature.

DOI： 10.1299/kikaib.76.764_536

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (other academic)  

近年，CTやMRIなどの医療画像から鼻腔の3次元実形状を再構築し，嗅覚機能，温度や湿度の調節機能，異物除去フィルター機能などに関連して，鼻腔内流れのCFD解析が行われている．しかしながら従来の解析モデルでは非構造格子および境界適合格子で構成されることが多く，格子生成に高度なノウハウと多大な労力と時間を必要としている．このような格子生成のコストを解決する方法としてボクセル格子法の適用が検討されている．本研究では医療画像より再構築した鼻腔のボクセル格子モデルを用いて気流シミュレーションを行った．

DOI： 10.11368/nhts.2010.0.89.0

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.11345/nctam.58.325

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.phpro.2010.01.042

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Airflow patterns in the nasal cavity strongly affect the uptake and deposition of inhales pollutants, air-borne particles, and odorants over the entire nasal mucosa. Because of the nasal cavity's small size and structural complexity, the ability to accurately estimate the anatomically dependent airflow structures remains a challenge. In this study, the nasal cavity geometry was reconstructed from in vivo acquired CT data of the nasal passages in one healthy subject, and Voxel based CFD simulations were carried out for airflow in the nasal cavity model. In terms of the application to medical treatment, usefulness of these modeling techniques was discussed.

Language：Japanese   Publishing type：Research paper (scientific journal)  

The development of High Intensity Focused Ultrasound (HIFU) therapy for the treatment of deeply-placed tumor has been desired. Problems are the displacement of focal point due to the reflection and refraction of ultrasound at the interfaces of bones and the attenuation of ultrasound due to the skins, fat and tissues. To minimize the invasive region of tissues by HIFU, the numerical simulation is available for the prediction of the treatment of tissues. In the present study, the HIFU therapy for the liver tumor is represented numerically. The simulation with the heat coagulation shows that the increase of acoustic impedance due to the coagulation causes the scattering of ultrasound at the interface of the coagulation region, which then develops toward the transducer. Therefore, the influence of the heat coagulation of tissue on the acoustic field should be considered to predict the treatment region precisely.

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

We have proposed a fluid-structure coupling approach based on fixed mesh using the level set function to analyze FSI (Fluid-Structure Interaction) problems of compressible inviscid flow and large-deformable thin shell. In this approach, we introduce interface treatment using virtual particles with the level sets and structural normal velocities in order to enforce the continuity of normal velocity at the interface on a fluid fixed mesh. In this study, it is shown that the present method is also applicable to FSI problems of incompressible viscous fluid and thin shell. Then the virtual particles also possess the structural tangent velocities to impose no-slip condition at the interface. We deal with FSI problems with finite deformation and compare the numerical results of the present method and the ALE (Arbitrary Lagrangian-Eulerian) moving mesh based scheme quantitatively.

DOI： 10.11345/japannctam.58.0.197.0

Language：Japanese   Publishing type：Research paper (scientific journal)  

An efficient environment for design process, which combines advanced scientific simulators and informationtechnology, was proposed for skilled manufacturing field. The proposed system is based on a volume data asshape modeling, which can fully eliminate time-consuming preprocess for CFD. Simulator codes areconstructed on modern object-oriented middleware V-Sphere. This framework provides functions such asunified user interface, maintenance performance, and development efficiency.

DOI： 10.11345/japannctam.58.0.12.0

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.11351/jsaereview.30.51

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2197/ipsjtrans.2.140

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.11185/imt.4.780

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

This paper describes a simulation of octree with AMR using Fully Threaded Tree with Pedigree (pFTT) data structure that is most suitable for adaptive mesh strategy amongst standard, FTT and pFTT data structure. To validate the present approach, a simulation of the flow around a heated cylinder was performed on pFTT using AMR with temperature gradient as an index for refinement and un-refinement of cells. In the cylinder wake the finest cells were generated and moved along with the advection of Karman vortices.

Language：Japanese   Publishing type：Research paper (scientific journal)  

An incompressible flow solver on a Cartesian grid system was developed. This method can simulate the flow around an object of arbitrary shape on a Cartesian grid. The proposed method adopts a simple approach, which only requires the distance between the object surface and the closest cell center. Therefore this method is easy to implement and practical because the flow around a non-watertight geometry can be simulated without repairing the surface mesh of the geometry. In order to evaluate the effectiveness of this method, the flow around an object thinner than the mesh size and the flow around a circular cylinder (Reynolds number is ranging from 40 to 3000) were calculated. Consequently, it was found that the proposed method is robust and useful approach for practical problems.

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

ALE (Arbitrary Lagrangian-Eulerian) moving mesh based schemes are the most frequently used as fluid-structure coupling approaches. However the ALE based methods are not suitable for tracking interfaces with large deformation and movement. In this study, an Eulerian fixed mesh with the level set function is adopted. A novel interface treatment using virtual particles with the level set function is proposed to treat kinematical condition at the interface. A partitioned strong coupling algorithm is constructed in order to combine the level set particle interface treatment and advanced fluid and structure solvers, i.e. CIP (Constrained Interpolation Profile) -FEM for fluid and MITC (Mixed Interpolated Tensorial Components) shell elements for structure. The interface treatment capacity is evaluated and an expanding airbag is analyzed.

DOI： 10.11345/japannctam.57.0.286.0

Language：Japanese   Publishing type：Research paper (scientific journal)  

A fluid-structure coupling approach based on level set function is proposed in order to solve large deformation problems that are difficult to interface tracking method, such as ALE (Arbitrary Lagrangian-Eulerian) method. The fluid flow field is solved by using fixed mesh because the level set function can describe a complicated geometrical shape in analysis grids easily. In this study, kinematrical condition treatment with virtual particles is introduced at the fluid-structure interface and iterative computation based on a partitoned solution method is implemented.

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

An Object-Oriented framework and class libraries with parallelism are designed and developed to enhance the construction of parallel physical simulators, which adopt domain decomposition method. Developed parallel data class is a class library that integrates a data structure and functions to manipulate the arrays for parallelisation. This data class can be used in both C/C++ and Fortran language. A benchmark code, which abstracts the part of a Jacobi iteration method for the elliptic partial differential equation, was ported using present framework and parallelized in C++/f90 mixed language. Measured timing results on Linux cluster showed us that the ported benchmark code using functions of the framework has almost the same performance and scalability of the original MPI benchmark code.

Language：Japanese   Publishing type：Research paper (scientific journal)  

前立腺癌や乳癌の治療に用いられる高密度焦点式超音波療法を肝臓癌や脳腫瘍等の深部の治療に用いる際,超音波の反射・屈折による焦点位置のずれが問題となっている.本講演では,超音波発振装置のCADデータから生成される符号付き距離関数を直交格子系における形状表現に利用した超音波伝播アプリケーションと,環状アレイ型超音波発振装置の位相遅延による焦点位置および音圧の変化を解析した結果について報告する.

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

This paper describes a simulation of octree AMR using Fully Threaded Tree with Pedigree (pFTT) data structure that is most suitable for adaptive mesh strategy among standard, FTT and pFTT data structures. To validate the present approach, a scalar transport equation was calculated on pFTT, using AMR with scalar gradient as an index for joining and splitting cells. According to numerical experiments, it was found that this method was able to capture a face of discontinuity appropriately. Skipping the process of joining and splitting, however, leads to the decline of the numerical accuracy and the increase of the calculation costs. Reasonably good results were obtained with every or every 2 steps joining and splitting on pFTT using AMR.

Language：Japanese   Publishing type：Research paper (scientific journal)  

Focused ultrasound treatment is widely applied in the clinical treatment, for example the tumor ablation with High Intensity Focused Ultrasound (HIFU). HIFU shows considerable nonlinearity due to its high pressure amplitude, and it is attenuated, reflected and refracted in the medium. Previously, researchers have simulated the ultrasound field using linear and nonlinear approximation equations. However, the predictions using these equations have restrictions such that the higher order nonlinearity or the reflection and refraction cannot be reproduced. So we apply axsymmetric Navier-Stokes equation to the governing equation to solve the ultrasound propagation without such restrictions. We calculated the profile of temperature rise in a liver with the model of an array transducer and an absorption effect. It is concluded that the temperature rise is focused at focal point by modeling array transducer and the ratio of the parameters inside the absorption coefficient affects the temperature rise and distribution.

Language：Japanese   Publishing type：Research paper (scientific journal)  

Voxel based simulation is very convenient at the early stages of a product design because the simple block approximation of a shape can realize automatic and robust mesh generation. However, the voxel method is not capable of simulating the characteristics of flow and expressing the detail shapes less than the voxel size. Therefore, the relationship based on an experimental data, which reflects the flow characteristics, is often incorporated into the simulation as boundary conditions. For accurate flow simulation in an engine bay, the satic pressure drop caused by heat exchanger should be taken into account in governing equations. In this paper, the modeling of pressure loss at the heat exchanger on the voxel method is proposed. Incompressible flow around a heat exchanger was calculated using the present method as verification. It was found that the proposed method could accurately predict the pressure drop and flow field.

Language：Japanese   Publishing type：Research paper (scientific journal)  

This panel discussion intends to find hints for a visualization system of the next generation. The Panelists are invited from major research centers that are performing large-scale simulation and visualization. The computer hardware is upgrading its performance every quarter and enables us to calculate more large-scale grid points as we can find in the TOP500 list. On the other hand, a few visualization system can currently deal with the huge amount of data that is generated by tera-scale computing. In addition, since the almost large-scale computation will be conducted on distributed parallel environment, the visualization system will be so much more complicated.
Open discussion will be expected to share issues and to derive useful knowledge for the visualization system of the next generation.

DOI： 10.3154/jvs.26.Supplement1_39

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

This paper describes concept and implementation of a novel simulation framework for various physical simulations. The framework, which is called SPHERE, is a kind of application framework to realize the unified software structure. SPHERE allows us to write program more efficient and to use the application easy. Besides, the framework is working on several major platforms with standard libraries. Thus, this system will provide a productive environment for physical simulation code developpers.

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

This paper describes the comparison of octree data structure intending to find a suitable one for the simulation with a solution adaptive octree mesh. We compared three different kind of implementation of octree, such as Standard, FTT and Pedigree FTT that we proposed, performing simulation programs of a steady-state heat transfer problem. It was found that Pedigree FTT appeared to be most suitable among them from the view points of memory utilization and calculation cost.

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

With the advance of high performance computing and modern numerical simulation technology, flow fields obtained from the simulation are becoming more and more large and complex. It is an extremely challenging problem to display a large flow field in the limited 2D space on a computer screen. In this paper, we present a system that adapts display resources to user intentions by using eye-tracking data. When observing a flow field, users usually gaze at some particular regions, such as around a critical point, the boundary of an object, and selectively follow some important structure or interesting flow pattern. Since "viewing" is the most important user task in flow observation, we assume it is possible to predict users' intentions, either conscious or unconscious ones, by analyzing eye-tracking data. The proposed system employs a set of focus+context visualization techniques to effectively visualize the regions of interest, which are automatically predicted based on eye-tracking data.

DOI： 10.3154/jvs.25.Supplement1_255

Language：Japanese   Publishing type：Research paper (scientific journal)  

This paper reports a newly designed visualization API (Application programming Interface) for a Cartesian and octree data structure which allows us. to render and visualize the data efficiently. It is designed that this visualization API is consists of a window frame class, a scene-graph class and a visualization function class. The window frame class is constructed from wxWidgets, which is open source GUI system, so as to be operated on major platforms such as Linux, Windows and MacOS X. As concerns the scene-graph class, we developed an original API instead of the standard sene-graph library like VTK because of seeking of the rendering efficiency and supporting the special data structure. Based on this API, a rendering application was developed and evaluated. This data viewer will be delivered from RIKEN.

DOI： 10.3154/jvs.25.Supplement2_365

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

A new-designed framework for building a visualization system was proposed and developed. This framework enables us to extend a new function easily as a module. In addition, this framework and a sample application are operating on major platforms, such as MacOSX, Linux and Windows operation systems. Sample application shows several functions intended for actual design work. In particular, the function of multiple-on-screen windows provided by the framework is very useful, especially in combination with multiple results.

DOI： 10.3154/jvs.25.Supplement1_249

Language：Japanese   Publishing type：Research paper (scientific journal)  

An urgent problem of Computational Fluid Dynamics (CFD) system from the viewpoint of users is a treatment of complex geometries that we must face in the real world It is also recognized that care for the operation of CFD system for actual design process of products is an underlying issue To overcome these issues, a newly Cartesian based CFD system, which combines volume data, was proposed The combination between shape expression by implicit function, an octree data structure and several kinds of shape capturing schemes provides the flexibility of the shape approximation for users Thus, the users will be able to control the balance of prediction accuracy and computation time In addition, a class library of C++, which has a unified user-interface, is constructed for the solver development in order to increase userfnendhness and efficiency of the solver development

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

A novel software "AVS/Express PCE", which runs on commodity-based PC cluster, was developed to visualize a large-scale data set efficiently. This system allows users to customize functions without any parallel knowledge and provides parallelized processes for almost all of processes such as I/O, filtering, mapping, and rendering. It is very effective to parallelize all processes but the image compositing becomes a bottleneck for a parallel rendering system. To avoid this problem, a special hardware that can synthesize an output image from input images without significant delay was combined to the software. According to preliminary test results, the present system performed about 4 frames per second to update iso-surfaces for a million grids field data.

DOI： 10.3154/jvs.24.Supplement1_299

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11458/tsj.32.263

Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

A parallel volume rendering system that incorporated a hardware compositor was developed to visualize unsteady large-scale data set in real-time. This rendering system is constructed by PC-cluster on a master-slave basis, and utilizes hardware functions of GPU on a modern graphics card. At first, a master node divides a data region into several sub-domains, and then each slave node renders the images for each domain. Generated images on each Slave-PC are gathered and overlapped each other according to a BSP tree, which is determined by the relation between an eye point and the position of each domain. This superimpose process is carried out on a composite hardware to minimize the transmission and synthesis time of the images. It was found that the present visualization system achieved enough interactivity with 10-15 fps for time varying data of 25.6GB.

DOI： 10.3154/jvs.24.Supplement1_311

Language：English   Publishing type：Research paper (other academic)  

DOI： 10.1145/827051.827072

Language：Japanese   Publishing type：Research paper (scientific journal)  

This paper describes the design and performance of an interactive visualization system developed specifically for time-varying volume data from thermal flow simulations. The system uses compression to allows for better memory utilization and faster data transfer, hardware accelerated rendering to enable interactive exploration for parameters and fluid phonomenon, and an intuitive user interface to support comparative visualization. It was found that this system have enough capabilities for interactive visualization. Especially, the latest commodity hardware will accelerrate the perfomance of this system.

Language：Japanese   Publishing type：Research paper (scientific journal)  

This paper describes the implementation of various boundary conditions using simple immersed boundary method originally proposed by Peskin. The direct forcing technique, extended by Fadlun, is used for the caliculation of the external force in Navier-Stokes equations and has the capability of representation not only for walls but also various types of boundaries. Avoiding the intepolation to achive higher approximation of shape, the present method has a very robust feature. Two examples are demonstrated in this paper, one is flow around a circular cylinder and the other is flow induced by a fan.

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11372/souonseigyo1977.27.318

Language：Japanese   Publishing type：Research paper (scientific journal)  

Cartesian grid method has higher availability for actual problems of design as First Order Analysis. Especially, simple block approximation is of great stability at the grid generation stage. In this case, arbitrary patterns of wall appear in the computational domain where adequate pressure boundary condition should be employed. In this paper, an implementation of boundary condition that is build into the discretized scheme of pressure Poisson equation is proposed. This method eliminates the difficulties such as the reference points that have multiple value of pressure effectively.

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11426/nagare1982.21.16

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

It was discussed that how to apply the flow simulation to a vehicle designs in order to enhance the efficiency of the vehicle development on a digital process, which is emerging recently at almost automotive companies in the world. As the result of the discussion, it was derived that the requirements for the flow simulation at the early stage of the vehicle development. One of the most important factors for the flow analysis is the turnaround time of the simulation as well as the accuracy of the computation. From the standpoint of these situations, the Cartesian mesh method becomes the most powerful tool among various analysis methods. In this paper, the Cartesian method was classified by means of the level of shape approximation and each feature was reviewed briefly.

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Wind noise radiated from the side-window and the door mirror mounted on a vehicle was computed using Lighthill's acoustic analogy. The flow fields were calculated by the well established finite-difference method with an overlapped grid technique. Computed pressure fluctuation on the door mirror surface was compared with the measured one. It was found that the pressure fluctuation as the noise source was predicted with good accuracy. Then, the shape modification to reduce the wind noise was performed based on the visualized surface streamline and noise sources. Consequently, it was confirmed that the wind noise was reduced.

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English  

Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Unsteady flows around a door mirror mounted on a passenger car were computed using a third-order upwind-difference scheme and an overset grid technique. Aerodynamic noises in far field, emitted from the mirror, were calculated from pressure fluctuation on the surface using Curle's equation. They were synthesized by an Apple Macintosh.
Flow were separately visualized on a graphic workstation. Rendered images were transferred to the Macintosh. Those images and the synthesized sounds were edited into a video tape. We could evaluate the aerodynamic noise by our own ears without any physical model and investigate the relationship between flows and sounds in detail.

DOI： 10.3154/jvs.16.1Supplement_87

Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Flow around two square cylinders is investigated by the measurement of the surface pressure, the flow visualization and the supplementary numerical simulation. Two different types of flow patterns are observed which are characteristic of staggered arrangements. In either case, the gap flow is formed between two cylinders, which is biased towards the upstream cylinder. The biased flow then undergoes two different changes in the subsequent period depending on the relative location of cylinders. In the first case it flows on straightforward and finally builds up a strong vortex behind the upstream cylinder. In the second case it changes the direction and deviates towards the downstream cylinder. A strong vortex is now built up behind the downstream cylinder. However, the second flow is not stable and can not exist by itself. The fluctuation between the first and the second flows always appears in this case. The transition between the two flow regimes is abrupt under the continuous change in the cylinder arrangement.

DOI： 10.2322/jjsass1969.40.276

Language：Japanese   Publishing type：Research paper (scientific journal)  

Computational analysis was performed for the external flow around an automobile and the internal flow in the engine compartment using a multi-block grid system and a finite-difference method. Cooling performance of the radiator is evaluated by the flow quantity passing through the radiator. Computational results show quite good agreement with experimental data. Present method is applied to the design of an the inter-cooler, it shows that the cooling performance of the inter-cooler could be improve by changing the duct configuration.

DOI： 10.3154/jvs.11.Supplement2_135

Event date： 2024.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Kobe   Country：Japan  

Event date： 2024.9

Language：English   Presentation type：Poster presentation  

Venue：Kobe   Country：Japan  

Event date： 2024.9

Language：English   Presentation type：Poster presentation  

Venue：Yonezawa, Yamagata   Country：Japan  

Event date： 2024.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Vancouver, British Columbia   Country：Canada  

Event date： 2024.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Vancouver, British Columbia   Country：Canada  

Event date： 2024.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Vancouver, British Columbia   Country：Canada  

Event date： 2024.7

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：神戸市   Country：Japan  

Event date： 2024.4

Language：English  

Country：Japan  

Other Link： https://sighpc.ipsj.or.jp/HPCAsia2024/posters.html

Event date： 2024.3

Language：English   Presentation type：Oral presentation (general)  

Country：Taiwan, Province of China  

Other Link： https://sites.google.com/site/atathpsc/

Event date： 2024.3

Language：English   Presentation type：Oral presentation (general)  

Country：Taiwan, Province of China  

Other Link： https://sites.google.com/site/atathpsc/

Event date： 2024.2 - 2024.4

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学　稲森財団記念館   Country：Japan  

Event date： 2023.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：那覇   Country：Japan  

Event date： 2023.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福井県県民ホール, 福井   Country：Japan  

Event date： 2023.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：ミューザ川崎   Country：Japan  

Event date： 2023.11

Language：English  

Country：Singapore  

Other Link： https://www.iscb.org/iscb-news-items/5157-november-10-2023-giw-iscb-asia-2023-announcing-the-conference-programme

Event date： 2023.10

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2023.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：香川大学 幸町キャンパス   Country：Japan  

Event date： 2023.5

Language：English   Presentation type：Symposium, workshop panel (public)  

Country：Germany  

Other Link： https://www.isc-hpc.com/project-posters-2023.html

Event date： 2023.4 - 2024.4

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学筑紫キャンパス   Country：Japan  

Event date： 2023.3

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Other Link： https://sites.google.com/site/atathpsc/

Event date： 2023.3

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Other Link： https://sites.google.com/site/atathpsc/

Event date： 2022.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：仙台国際センター   Country：Japan  

Event date： 2022.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2022.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：札幌   Country：Japan  

Event date： 2022.7

Language：English   Presentation type：Oral presentation (general)  

Country：China  

Other Link： https://chinavis.org/2022/paper.html

Event date： 2022.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2022.3

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：オンライン   Country：Japan  

Event date： 2021.4

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

シミュレーションは与えられた支配方程式と初期条件・境界条件に基づいて時間積分し、現象の時間発展を追う。しかし、その支配方程式の形式が不明な現象も少なからずあり、方程式の形を知ることは現象理解に重要である。この講演では、遺伝的プログラミングを用いてデータから方程式を探索する方法とその可能性について紹介する。

Event date： 2021.1

Language：English   Presentation type：Symposium, workshop panel (public)  

Country：Japan  

Event date： 2020.4

Language：English  

Country：China  

Event date： 2020.1

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2020.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Event date： 2019.12

Language：English   Presentation type：Oral presentation (general)  

Country：Taiwan, Province of China  

Event date： 2019.12

Language：English   Presentation type：Oral presentation (general)  

Country：Taiwan, Province of China  

Event date： 2019.12

Language：English   Presentation type：Oral presentation (general)  

Country：Taiwan, Province of China  

Event date： 2019.12

Language：English   Presentation type：Oral presentation (general)  

Country：Taiwan, Province of China  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Sendai   Country：Japan  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Kawagoe   Country：Japan  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

Event date： 2019.7

Language：English   Presentation type：Oral presentation (general)  

Country：Poland  

Event date： 2019.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Saitama   Country：Japan  

Event date： 2019.5

Language：English   Presentation type：Oral presentation (general)  

Country：Germany  

Event date： 2018.12

Language：Japanese  

Venue：Tokyo   Country：Japan  

Event date： 2018.12

Language：Japanese  

Venue：Tokyo   Country：Japan  

Event date： 2018.11

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Event date： 2018.10

Language：English   Presentation type：Oral presentation (general)  

Country：Germany  

Event date： 2018.10

Language：English  

Country：Taiwan, Province of China  

Event date： 2018.6

Language：English   Presentation type：Oral presentation (general)  

Country：Germany  

Event date： 2018.5

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2018.5

Language：English  

Country：France  

Event date： 2018.3

Language：English  

Country：Japan  

Repository Public URL： http://hdl.handle.net/2324/1916269

Event date： 2018.2

Language：English   Presentation type：Oral presentation (general)  

Country：Taiwan, Province of China  

Event date： 2018.2

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Other  

Event date： 2018.1

Language：English  

Country：Japan  

Event date： 2018.1

Language：English  

Country：Japan  

Event date： 2017.12

Language：Japanese  

Venue：Hiroshima   Country：Japan  

Event date： 2017.12

Language：Japanese  

Venue：Kyoto   Country：Japan  

Repository Public URL： http://hdl.handle.net/2324/1916254

Event date： 2017.12

Language：Japanese  

Venue：Kyoto   Country：Japan  

Event date： 2017.11 - 2017.12

Language：English  

Country：Canada  

Event date： 2017.11

Language：English  

Country：Thailand  

Event date： 2017.10

Language：English  

Country：Switzerland  

Event date： 2017.10

Language：English  

Country：Brazil  

Event date： 2017.7

Language：English  

Country：Italy  

Event date： 2017.5

Language：English  

Country：Japan  

Event date： 2017.3

Language：Japanese  

Venue：Tokyo   Country：Japan  

Event date： 2017.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Event date： 2017.3

Language：Japanese  

Venue：Saga   Country：Japan  

Event date： 2017.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Event date： 2017.2

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2017.2

Language：English  

Country：Japan  

Event date： 2017.2

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2017.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

Event date： 2016.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：沖縄   Country：Japan  

Event date： 2016.12

Language：Japanese  

Venue：Naha   Country：Japan  

Event date： 2016.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都   Country：Japan  

Event date： 2016.12

Language：Japanese  

Venue：Kyoto   Country：Japan  

Event date： 2016.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Event date： 2016.12

Language：Japanese  

Venue：Tokyo   Country：Japan  

Event date： 2016.12

Language：Japanese  

Venue：Tokyo   Country：Japan  

Event date： 2016.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Event date： 2016.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋   Country：Japan  

Event date： 2016.11 - 2016.12

Language：English   Presentation type：Oral presentation (general)  

Country：Canada  

Event date： 2016.11

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Event date： 2016.11

Language：English  

Country：United States  

Event date： 2016.11

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：大阪   Country：Japan  

Event date： 2016.10

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.10

Language：English  

Country：Japan  

Event date： 2016.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：品川、東京   Country：Japan  

Event date： 2016.9 - 2017.5

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Event date： 2016.9

Language：English  

Country：Other  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北九州   Country：Japan  

Event date： 2016.9

Language：Japanese  

Country：Other  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.9

Language：Japanese  

Venue：Fukuoka   Country：Japan  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐、岐阜   Country：Japan  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.8

Language：English  

Country：Canada  

Event date： 2016.7

Language：English   Presentation type：Oral presentation (general)  

Country：Korea, Republic of  

Event date： 2016.7

Language：English  

Event date： 2016.7

Language：English  

Event date： 2016.7

Language：English  

Country：China  

Event date： 2016.6

Language：English  

Country：Greece  

Event date： 2016.6 - 2016.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：新潟   Country：Japan  

Event date： 2016.5

Language：English  

Country：Japan  

Event date： 2016.5

Language：English  

Country：Japan  

Event date： 2016.5

Language：English  

Country：Japan  

Event date： 2016.5

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.5

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.5

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.4

Language：English   Presentation type：Oral presentation (general)  

Country：Taiwan, Province of China  

Event date： 2016.4

Language：English  

Country：France  

Event date： 2016.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：熊本   Country：Japan  

Event date： 2016.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：神戸大学   Country：Japan  

Event date： 2015.11

Language：English  

Country：Japan  

Event date： 2015.10

Language：English  

Country：United States  

Event date： 2015.7

Language：English  

Country：Netherlands  

Event date： 2014.8

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2014.7

Language：English  

Country：Italy  

Event date： 2014.6 - 2014.7

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Event date： 2014.6 - 2014.7

Language：English  

Country：United States  

Event date： 2014.3

Language：English   Presentation type：Oral presentation (general)  

Country：Korea, Republic of  

Event date： 2014.3

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2013.10

Language：English  

Country：United States  

Event date： 2012.7

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2012.7

Language：English  

Country：Greece  

Event date： 2011.6

Language：English   Presentation type：Oral presentation (general)  

Country：Greece  

Event date： 2010.12

Language：English  

Country：Korea, Republic of  

Event date： 2010.11 - 2010.12

Language：English  

Country：United States  

Event date： 2010.10

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2010.8

Language：English   Presentation type：Oral presentation (general)  

Country：Canada  

Event date： 2010.6

Language：English  

Country：Japan  

Event date： 2010.3

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Event date： 2009.12

Language：English  

Country：Japan  

Event date： 2009.12

Language：English  

Country：Japan  

Event date： 2009.11

Language：English   Presentation type：Symposium, workshop panel (public)  

Country：Germany  

Event date： 2009.9

Language：English  

Country：France  

Event date： 2008.11

Language：English   Presentation type：Symposium, workshop panel (public)  

Country：United States  

Event date： 2008.5

Language：English  

Country：France  

Event date： 2007.7 - 2007.8

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Event date： 2007.5

Language：English  

Country：Turkey  

Event date： 2006.7

Language：English   Presentation type：Oral presentation (general)  

Country：Belgium  

Event date： 2005.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2004.8

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Event date： 2003.7

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2002.3

Language：English  

Country：United States  

Event date： 1992.2

Language：English  

Country：United States  

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Other  

A third-order upwind finite difference scheme was applied to the analysis of the flow fields around a circular cylinder. The computations were made at various Reynolds numbers to investigate their effect on the flow phenomena including Karman vortex and the drag crisis in the range from 1, 000 to 1, 000, 000. The grid system is curvilinear type and the number of the grid points is about 100 thousand. A personal computer with a Pentium III of 600 MHz was used and the CPU time per run is about 50 hrs.
The computed results show the generation of the Karman vortex, whose Strouhal number is reasonable. Various flow phenomena can be observed in the visualized flow field. An example is that more small-sized vortices are observed in the flow fields with higher Reynolds numbers. Though the computed value of Cd is a little different from the experimental one, the drag crisis takes place at the almost same Reynolds number as in the experiment.

Language：Japanese  

Country：Other  

Water mist is one of the digestives noted for a new generation fire suppression system, and it has a lot of extinction effects. In this paper, the effect by the evaporation of droplets was considered, and the gas-droplet flow was computed for analysis of the water mist fire control. Especially, the cooling effect of water mist was discussed with changing the diameter of droplets. It was found through our computation that the distribution of droplets and the cooling effect change significantly according to the droplets diameters, and we conclude that the diameter of droplet is important parameter which determines the extinction effect of water mist fire suppression system.

Language：Japanese  

Country：Other  

A newly developed method of shape representation, the multi-level partition of unity (MPU) implicit surface, is applied to a moving boundary problem in voxel Cartesian grid. The MPU implicit surface allows us to construct surface models from very large sets of points with normal and polygon. An octree subdivision method is adapted to variations in the complexity of the local shape in the MPU. The MPU has a good compatibility with Cartesian based flow solvers having octree data structure. Combinations of the MPU and the shape approximation in Cartesian based flow solvers are discussed.

Language：Japanese  

Country：Other  

A method of shape representation, the multi-level partition of unity (MPU) implicit surface, is applied to a voxel based thermal fluid analysis. The MPU implicit surface allows us to construct surface models from very large sets of points with normal and polygon. An octree subdivision method is adapted to variations in the complexity of the local shape in the MPU. The MPU has a good compatibility with Cartesian based flow solvers. Some problems of fluid flow with heat transfer are solved. Advantages of this way are discussed.

Language：Japanese  

Country：Other  

Language：Japanese  

Country：Other  

Language：Japanese  

Country：Other  

High Intensity Focused Ultrasound (HIFU) therapy has been developed for the treatment of deeply-placed cancer such as the liver and brain cancer. Problems are the displacement of focal point due to the reflection and refraction of ultrasound at the interfaces of bones and the attenuation of ultrasound due to the skins, fat and tissues. To minimize the invasive region of tissues by HIFU, the numerical simulation is available for the. prediction of the treatment of tissues. The development of the numerical simulation of ultrasound propagation through the voxel modeled body based on the MRI and CT data is reported. The results of the three-dimensional computation show the displacement of focal point for the ultrasound of 1MHz through the bone plate in water.

Language：Japanese  

Country：Other  

High Intensity Focused Ultrasound (HIFU) therapy has been developed for the treatment of deeply-placed tumor such as the liver and brain tumor. Problems are the displacement of focal point due to the reflection and refraction of ultrasound at the interfaces of bones and the attenuation of ultrasound due to the skins, fat and tissues. To minimize the invasive region of tissues by HIFU, the numerical simulation is available for the prediction of the treatment of tissues. The development of the numerical simulation of ultrasound propagation through the voxel modeled body based on the MRI and CT data is reported. The results of the three-dimensional computation show the displacement of focal point for the ultrasound of 1 MHz through the bone.

Language：Japanese  

Country：Other  

Language：Japanese  

Country：Other  

Language：Japanese  

Country：Other  

Language：Japanese  

Country：Other  

Language：Japanese  

Country：Other  

Language：Japanese  

Country：Other  

In our project, we had to develop new scheme and algorithm to simulate blood flow on K computer. But, to development multi-scale / multi-physics simulation software is highly complex and difficult. We developed new middleware for parallel computing. This middleware which called SPHERE provides parallel software development environment for researchers and engineers to concentrate on their algorithms development. We developed new simulation software for clotting using SPHERE. For simulate clotting, we developed new scheme and algorithm for Fluid Structure Interface problems. This software which called ZZ-EFSI achieved a highly performance using K computer.

Language：Japanese  

Country：Other  

Computational fluid dynamics (CFD) analysis consists of three phases: 1) pre-processing, e.g., grid generation; 2) fluid analysis; and 3) post-processing, e.g., visualization. With the recent improvement in computer performance, pre-processing takes up a higher proportion of the total number of processes in extensive and complex CFD analyses. In this study, we developed a novel method for automatic generation of robust structured grids during the initial stage of fluid analysis to reduce the computational cost of grid generation. By implementing this method, we successfully reduced the computational cost of grid generation, and approximately thirty million grids were generated on the K computer within thirty minutes. By using these generated grids, over eighty percent weak scaling up to 4000 nodes on the K computer is obtained.

Language：Japanese  

Country：Other  

Language：Japanese  

Country：Other  

Airflow in a realistic nasal model was numerically simulated in order to investigate the transitional nature of flow. Computed tomography scans were used to reconstruct 3D realistic model of nasal airways. Voxel-based simulation of quiet restful inspiratory flow was performed using meshes with voxel pitches of 0.15 mm. Resultant velocity profiles and fluctuations were discussed in comparison to our previous experimental study. As a result, good agreement was observed between the velocity profiles and those measured experimentally, whereas the velocity fluctuations were much smaller than those observed experimentally.

Language：Japanese  

Country：Other  

エクサスケールのスーパーコンピュータ時代を前に,新たな並列性を生む計算科学技術として期待される時間並列計算法の研究開発動向,計算法概要一応用例,その課題及び将来の展望について述べる.

Language：Japanese  

Country：Other  

Airflow in a realistic nasal model was numerically simulated in order to investigate the transitional nature of flow. Computed tomography scans were used to reconstruct 3D realistic model of nasal airways. Direct numerical simulation of quiet restful inspiratory flow was performed using meshes with voxel pitches of 0.05 mm. This study investigates the effect of inflow velocity profile on transitional flow during steady nasal inspiration. Resultant velocity profiles and fluctuations were discussed in comparison between the naturally inflow profile and the simplified flat velocity profile at the nostril. As a result, simplified inflow profile is found to affect structure of the flow. The velocity fluctuations in flat velocity profile were smaller than those in the naturally inflow profile.

Language：English  

Country：Other  

Language：Japanese  

Country：Other  

Language：Japanese  

Country：Other  

Language：Japanese  

Country：Other  

Language：Japanese  

Country：Other  

Language：Japanese  

Country：Other  

Language：Japanese  

Country：Other  

Language：English   Presentation type：Oral presentation (general)  

Country：Other  

Language：English  

Country：Other  

Language：English  

Country：Other  

Language：Japanese  

Country：Other  

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Peer review 

Number of peer-reviewed articles in Japanese journals：1

Proceedings of International Conference Number of peer-reviewed papers：5

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Peer review 

Number of peer-reviewed articles in foreign language journals：2

Number of peer-reviewed articles in Japanese journals：2

Proceedings of International Conference Number of peer-reviewed papers：8

Proceedings of domestic conference Number of peer-reviewed papers：0

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：130

Type：Competition, symposium, etc. 

Number of participants：128

Type：Scientific advice/Review