Updated on 2024/10/07

Information

 

写真a

 
WATANABE SEIYA
 
Organization
Research Institute for Applied Mechanics Renewable Energy Center Assistant Professor
Kyushu University Platform of Inter/Transdisciplinary Energy Research （Joint Appointment）
Research and Education Center for Offshore Wind （Joint Appointment）
Interdisciplinary Graduate School of Engineering Sciences Department of Interdisciplinary Engineering Sciences（Joint Appointment）
Title
Assistant Professor
Contact information
メールアドレス
Tel
0925837748
Profile
格子ボルツマン法による浮体式洋上風力タービンのウェイク解析，クラスター型風レンズ風車の性能評価，洋上ウィンドファームの風況解析を行っている．
Homepage
External link

Research Areas

  • Informatics / High performance computing

  • Frontier Technology (Aerospace Engineering, Marine and Maritime Engineering) / Marine engineering

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Fluid engineering

Degree

  • Doctor of Engineering

Research History

  • Kyushu University Research Institute for Applied Mechanics Assistant Professor

    2020.1 - Present

    　 More details

    Country：Japan

    researchmap

Research Interests・Research Keywords

  • Research theme：Wake Simulation of a Floating Offshore Wind Turbine by Two-Phase Lattice Boltzmann Method

    Keyword：Lattice Boltzmann method, Two-phase flow, Floating offshore wind turbine , wake

    Research period： 2024.4

  • Research theme：高性能計算

    Keyword：高性能計算

    Research period： 2024

  • Research theme：風力エネルギー

    Keyword：風力エネルギー

    Research period： 2024

  • Research theme：格子ボルツマン法

    Keyword：格子ボルツマン法

    Research period： 2024

  • Research theme：数値流体力学

    Keyword：数値流体力学

    Research period： 2024

  • Research theme：GPUコンピューティング

    Keyword：GPUコンピューティング

    Research period： 2024

  • Research theme：CFD simulations of clustered wind lens turbine

    Keyword：lattice Boltzmann method, wind-lens turbine

    Research period： 2022.1

  • Research theme：Large scale simulation for offshore wind farm using lattice Boltzmann method

    Keyword：lattice Boltzmann method, offshore wind farm, large-scale CFD simulation

    Research period： 2021.10

  • Research theme：Performance Evaluation of the Lattice Boltzmann Method on the Supercomputer Fugaku

    Keyword：lattice Boltzmann method, A64FX, Fugaku, HPC

    Research period： 2020.11 - 2023.3

  • Research theme：CFD simulations of tidal current turbines using the lattice Boltzmann method

    Keyword：tidal turbine, CFD, lattice Boltzmann method

    Research period： 2020.10 - 2022.3

  • Research theme：Simulation for ice‐transiting vessel by using lattice Boltzmann method

    Keyword：Ice‐transiting vessel, Ice load, Fluid-structure interaction, Lattice Boltzmann method

    Research period： 2020.1 - 2022.6

  • Research theme：Multi-GPU computing of adaptive mesh refinement method to allocate high-resolution grid to free surface

    Keyword：Adaptive mesh refinement, Free-surface flow, GPU, Space filling curve, Lattice Boltzmann method

    Research period： 2018.4

  • Research theme：Dynamic load balancing for adaptive mesh refinement method

    Keyword：Dynamic load balancing, Domain decomposition, Adaptive mesh refinement, Multi-phase-field method, Parallel computing

    Research period： 2017.4 - 2020.3

Awards

  • 若手優秀講演フェロー表彰

    2023.9   日本計算工学会 第28回計算工学講演会  

    渡辺勢也

    　More details

  • 日本風力エネルギー学会優秀発表賞

    2023.5   日本風力エネルギー学会 第44回風力エネルギー利用シンポジウム  

    渡辺勢也

    　More details

  • 優秀発表賞

    2024.5   日本風力エネルギー学会・第45回風力エネルギー利用シンポジウム  

  • 若手優秀講演フェロー表彰

    2023.9   日本計算工学会 第28回計算工学講演会  

  • グラフィクスアワード特別賞（Meshman-Data Science賞）

    2023.6   日本計算工学会 第28回計算工学講演会  

  • グラフィクスアワード特別賞（Hexagon Digital Twin賞）

    2023.6   日本計算工学会 第28回計算工学講演会  

  • グラフィクスアワード動画賞

    2023.6   日本計算工学会 第28回計算工学講演会  

  • グラフィクスアワード優秀賞

    2023.6   日本計算工学会 第28回計算工学講演会  

  • グラフィクスアワード優秀賞

    2023.6   日本計算工学会 第28回計算工学講演会  

    Yin Yuwei,青木尊之,渡辺勢也,小林宏充,丹羽政善

    　More details

  • グラフィクスアワード特別賞（Meshman-Data Science賞）

    2023.6   日本計算工学会 第28回計算工学講演会  

    瀧優太, Tan Hong Guan, 渡辺勢也, 青木尊之

    　More details

  • グラフィクスアワード特別賞（Hexagon Digital Twin賞）

    2023.6   日本計算工学会 第28回計算工学講演会  

    瀧優太, Tan Hong Guan, 渡辺勢也, 青木尊之

    　More details

  • グラフィクスアワード動画賞

    2023.6   日本計算工学会 第28回計算工学講演会  

    瀧優太, Tan Hong Guan, 渡辺勢也, 青木尊之

    　More details

  • 日本風力エネルギー学会優秀発表賞

    2023.5   日本風力エネルギー学会 第44回風力エネルギー利用シンポジウム  

  • グラフィクスアワード特別賞（Visual Computing賞）

    2022.6   日本計算工学会 第27回計算工学講演会  

  • グラフィクスアワード特別賞（Visual Computing賞）

    2022.6   日本計算工学会 第27回計算工学講演会  

    野間 優希、渡辺 勢也、胡 長洪

    　More details

  • 若手優秀講演フェロー表彰

    2021.12   日本計算工学会 第26回計算工学講演会  

  • 若手優秀講演表彰

    2021.12   日本流体力学会 第35回数値流体力学シンポジウム  

  • グラフィクスアワード特別賞

    2021.6   日本計算工学会・第26回計算工学講演会  

  • グラフィクスアワード最優秀賞

    2021.5   日本計算工学会・第26回計算工学講演会  

  • ベストCFDグラフィックスアワード動画部門 最優秀作品賞

    2020.12   日本流体力学会・第34回数値流体力学シンポジウム  

  • 若手優秀ポスター賞 最優秀賞

    2020.11   日本船舶海洋工学会・令和2年日本船舶海洋工学会秋季講演会  

  • グラフィックスアワード特別賞（Visual Computing賞）

    2020.6   日本計算工学会・第25回計算工学講演会  

  • グラフィックスアワード優秀賞

    2020.6   日本計算工学会・第25回計算工学講演会  

  • ベストCFDグラフィックスアワード静止画部門 最優秀作品賞

    2018.12   日本流体力学会・第32回数値流体力学シンポジウム  

  • Phase-Field Student Award

    2018.11  

  • グラフィックスアワード特別賞（MicroAVS賞）

    2017.6   日本計算工学会・第22回計算工学講演会  

  • Best Presentation Award for Thermal Engineering

    2017.3   The 11th China-Japan-Korea Student Symposium, Zhejiang University  

  • 優秀講演賞

    2016.9   日本機械学会・第29回計算力学講演会  

  • グラフィックスアワード特別賞（MicroAVS賞）

    2016.6   日本計算工学会・第21回計算工学講演会  

  • グラフィックスアワード特別賞（MSC Apex賞）

    2016.6   日本計算工学会・第21回計算工学講演会  

  • 最優秀論文賞

    2016.2   東京工業大学 総合理工学研究科 創造エネルギー専攻  

  • ベストCFDグラフィックスアワード動画部門第2位

    2015.12   日本流体力学会・第29回数値流体力学シンポジウム  

  • 粉体工学会ベストプレゼンテーション賞（BP賞）

    2015.5   粉体工学会・2015年度春期研究発表会  

▼display all

Papers

  • Coupled Lattice Boltzmann and Discrete Element Simulations of Ship-Ice Interactions

    Seiya Watanabe, Changhong Hu, Takayuki Aoki

    IOP Conference Series: Materials Science and Engineering   1288 ( 1 )   012015 - 012015   2023.8   （ ISSN:1757-8981 eISSN:1757-899X ）

    　More details

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

    Abstract

    Evaluating ice loads acting on ships is essential for the safety of ships navigating in ice-covered seas. In this study, we develop a CFD method to handle ship, ice, and fluid interaction. The lattice Boltzmann method, capable of large-scale calculations, is applied to the simulation of free-surface fluids. The ice motion is computed by solving the equations of motion of a rigid body, and the discrete element method models the ice-ice and ice-ship contact interactions. A momentum exchange scheme couples the lattice Boltzmann method and particle-based rigid body simulation. We introduce tree-based adaptive mesh refinement and multiple GPU computing to improve grid resolution and computational time. The proposed method is applied to model scale simulations of ship navigation in a brash ice channel. Simulations were performed for various conditions with different ice concentrations and ship velocities, and we observed that ice resistance increased with the ice concentration and the ship velocity increased. The ice motions and resistances obtained from our simulations are reasonable compared to model equations of Finnish-Swedish ice class rules (FSICR) and numerical analyses of a previous study.

    DOI： 10.1088/1757-899x/1288/1/012015

    researchmap

    Other Link： https://iopscience.iop.org/article/10.1088/1757-899X/1288/1/012015/pdf

    Repository Public URL： https://hdl.handle.net/2324/7183292

  • An experimental study of surface wave effects on two interacting tidal turbines Reviewed International journal

    Seiya Watanabe, Mohamed M. Kamra, Changhong Hu

    Journal of Marine Science and Technology   28 ( 2 )   387 - 398   2023.6   （ ISSN:0948-4280 eISSN:1437-8213 ）

    　More details

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

    The development of tidal turbine farms desires an understanding of the effects of free-surface waves and turbine interactions. The objective of this paper is to investigate surface wave effects on the performance of two tidal turbines axially aligned with current flows. Scale model experiments with and without regular waves are conducted on two horizontal-axis tidal turbines in a towing tank. Regular waves have no effect on time-averaged performance but induce periodic fluctuations in rotor torque for the upstream turbine that is not impacted by the wake of other turbines. Waves improve downstream turbine performance marginally, and the amplitude of torque fluctuations is frequently lower than that of the upstream turbine. A comparison of five wave situations with varying wave heights and periods is also explored. It is demonstrated that as the wave height and period increased, so did the range of torque variation.

    DOI： 10.1007/s00773-023-00929-6

    Web of Science

    Scopus

    researchmap

    Repository Public URL： https://hdl.handle.net/2324/7173563

  • Free-surface flow simulations with floating objects using lattice Boltzmann method Reviewed International journal

    Seiya Watanabe, Jun Kawahara, Takayuki Aoki, Kenta Sugihara, Shinsuke Takase, Shuji Moriguchi, Hirotada Hashimoto

    Engineering Applications of Computational Fluid Mechanics   17 ( 1 )   Article number 2211143   2023.5   （ ISSN:19942060 eISSN:1997003X ）

    　More details

    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Informa UK Limited  

    In tsunami inundations or slope disasters of heavy rain, a lot of floating debris or driftwood logs are included in the flows. The damage to structures from solid body impacts is more severe than the damage from the water pressure. In order to study free-surface flows that include floating debris, developing a high-accurate simulation code of free-surface flows with high performance for large-scale computations is desired. We propose the single-phase free-surface flow model based on the cumulant lattice Boltzmann method coupled with a particle-based rigid body simulation. The discrete element method calculates the contact interaction between solids. An octree-based AMR (Adaptive Mesh Refinement) method is introduced to improve computational accuracy and time-to-solution. High-resolution grids are assigned near the free surfaces and solid boundaries. We conducted two kinds of tsunami flow experiments in the 15 and 70 m water tanks at Hachinohe Institute of Technology and Kobe University to validate the accuracy of the proposed model. The simulation results have shown good agreement with the experiments for the drifting speed, the number of trapped wood pieces, and the stacked angles.

    DOI： 10.1080/19942060.2023.2211143

    Web of Science

    Scopus

    CiNii Research

    researchmap

    Repository Public URL： https://hdl.handle.net/2324/7183291

  • Lattice Boltzmann simulations for multiple tidal turbines using actuator line model Reviewed International journal

    Seiya Watanabe, Changhong Hu

    Journal of Hydrodynamics   34 ( 3 )   372 - 381   2022.6   （ ISSN:1001-6058 eISSN:1878-0342 ）

    　More details

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

    In numerical simulations of tidal current farms, large-scale computational fluid dynamic (CFD) simulations with a high-resolution grid are required to calculate the interactions between tidal turbines. In this study, we develop a numerical simulation method for tidal current turbines using the lattice Boltzmann method (LBM), which is suitable for large-scale CFD simulations. Tidal turbines are modeled by using the actuator line (ACL) model, which represents each blade as a group of actuator points in a line. In order to validate our LBM-ACL model, we perform simulations for two interacting tidal turbines, and results of turbine performance are compared with a water tank experiment. The proposed model successfully reproduces the variation of the torque due to wave effects and mean turbine performance. We have demonstrated a large-scale simulation for ten tidal turbines using 8.55×108 grid points and 16 GPUs of Tesla P100 and the simulation has been completed within 9 hours with the LBM performance of 392 MLUPS per GPU.

    DOI： 10.1007/s42241-022-0037-0

    Web of Science

    Scopus

    researchmap

    Repository Public URL： https://hdl.handle.net/2324/7183290

  • Performance Evaluation of Lattice Boltzmann Method for Fluid Simulation on A64FX Processor and Supercomputer Fugaku

    Seiya Watanabe, Changhong Hu

    ACM International Conference Proceeding Series   1 - 9   2022.1   （ ISBN:9781450384988 ）

    　More details

    Publishing type：Research paper (international conference proceedings)  

    The lattice Boltzmann method has recently become popular as an alternative to Navier-Stokes solvers for large-scale fluid simulations. We conduct a performance study of the lattice Boltzmann method on the A64FX Arm-based processor of the supercomputer Fugaku. We compared four types of data layouts: SoA, AoS, Clusterd SoA (CSoA), and CSoA2, and three algorithms for the LBM streaming step: Pull, Push, and Swap schemes. The performance measurement on a single CMG (Core Memory Group) shows that the combination of the CSoA2 layout and the Swap scheme has the highest performance of 176 GFLOP, which corresponds to 11.5% of the single-precision peak performance. Our simulations have demonstrated good weak scaling up to 16,384 nodes and achieved high performance 10.9 PFLOPS in single precision. The strong scalability is also a good result, with parallel efficiencies of 63.9%, 68.3% and 72.7 % for the D3Q15, D3Q19 and D3Q27 velocity model, respectively when scaling from 512 to 16,384 nodes.

    DOI： 10.1145/3492805.3492811

    Scopus

    researchmap

  • Large-scale flow simulations using lattice Boltzmann method with AMR following free-surface on multiple GPUs Reviewed International journal

    @Seiya Watanabe, @Takayuki Aoki

    Computer Physics Communications   264 ( 5 )   2021.7

    　More details

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

    DOI： 10.1016/j.cpc.2021.107871

    Repository Public URL： https://hdl.handle.net/2324/7183280

  • Numerical simulation of dam break flow impact on vertical cylinder by cumulant lattice Boltzmann method Reviewed International journal

    @Seiya Watanabe, #Shintaro Fujisaki, @Changhong Hu

    Journal of Hydrodynamics   33   185 - 194   2021.4

    　More details

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

    DOI： 10.1007/s42241-021-0028-6

    Repository Public URL： https://hdl.handle.net/2324/7183283

  • A Domain Partitioning Method Using a Multi-phase-field Model for Block-based AMR Applications Reviewed International journal

    @Seiya Watanabe,@Takayuki Aoki,@Tomohiro Takaki

    Parallel Computing   2020.5

    　More details

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

    DOI： https://doi.org/10.1016/j.parco.2020.102647

    Repository Public URL： https://hdl.handle.net/2324/7183277

  • CFD simulation of a multi-rotor system using diffuser augmented wind turbines by lattice Boltzmann method

    Watanabe S., Yoshikawa M., Hu C.

    Journal of Physics: Conference Series   2767 ( 7 )   2024   （ ISSN:17426588 ）

    　More details

    Publisher：Journal of Physics: Conference Series  

    A diffuser-augmented wind turbine (DAWT) achieves greater power generation efficiency by increasing wind speed through the diffuser. Nevertheless, scaling up this technology is difficult because of the considerable amount of wind drag on the diffusers. To overcome this difficulty, a multi-rotor system with two or more wind turbines on the same structure is one approach to increasing wind turbine power output. This research proposes a computational fluid dynamics (CFD) method to evaluate the hydrodynamic performance of a large-scale multi-rotor system of DAWTs. Compared to conventional wind turbines, CFD simulations of DAWTs necessitate higher computational costs because of the need of high-resolution meshes for the diffuser. Furthermore, the computational cost of a multi-rotor system increases with the number of rotors. To address the issue of high computational cost, we use the Lattice Boltzmann Method (LBM), which is well suited to large-scale CFD simulations. A wind turbine is modeled as an actuator line model and a diffuser as a wall boundary. An adaptive mesh refinement approach generates higher resolution meshes near the rotor and diffuser. LBM simulations were conducted for a single DAWT and a multi-rotor system with five DAWTs. The LBM results of the wake velocity and pressure distributions were in agreement with those obtained from wind tunnel experiments and general CFD methods in earlier studies. To investigate the diffuser gap effects, we simulated five DAWTs with diffuser gaps of 5%-25% of the diffuser diameter. The power gain of each DAWT was assessed. Great performance improvements were found with diffuser gaps of 20% and 25% of the diffuser diameter. On average, the five DAWTs achieved a power gain of more than 10%. These findings confirmed the accurate evaluation capability of the proposed CFD method for hydrodynamic characteristics of multi-rotor systems using DAWTs.

    DOI： 10.1088/1742-6596/2767/7/072002

    Scopus

  • Lattice Boltzmann simulation for wake interactions of aligned wind turbines using actuator line model with turbine control

    Watanabe S., Hu C.

    Journal of Physics: Conference Series   2767 ( 5 )   2024   （ ISSN:17426588 ）

    　More details

    Publisher：Journal of Physics: Conference Series  

    A wind turbine wake causes a decrease in wind speed and an increase in turbulence intensity. The wind turbine wake interaction is essential for predicting the power output of a wind farm consisting of many wind turbines. This research proposes a CFD method able to reproduce wake interactions and power outputs of multiple wind turbines with high speed and accuracy. Large eddy simulations with the lattice Boltzmann method are used for fluid calculations, specifically for large-scale CFD simulations. The wind turbines are represented using an actuator line model. Optimal power generation efficiency is achieved by controlling the rotor speed and blade pitch angle. Large-scale simulations of eight aligned wind turbines are conducted using 1.75 billion grid points and 40 GPUs. We compare two cases with and without control to investigate the effect of turbine control on wake and power output. Both the instantaneous and mean streamwise velocities confirm that the turbine control reduces the wake velocity deficit of the downwind wind turbine. High-speed inflow of wind to the downstream turbines augments their power output. With implementation of turbine control, the power outputs of the downstream turbines agree well with the observation data obtained in an earlier study. The results demonstrate the importance of controlling the rotational speed and pitch angle for actuator line simulations.

    DOI： 10.1088/1742-6596/2767/5/052020

    Scopus

  • 野球のジャイロ・フォークボールの空力解析 Reviewed

    尹昱炜, 青木尊之, 渡辺勢也, 小林宏充, 丹羽政善

    ながれ   42 ( 6 )   376 - 385   2023.12

    　More details

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

    Repository Public URL： https://hdl.handle.net/2324/7183294

  • Aerodynamic Study on “Gyro-forkball” of Baseball

    YIN Yuwei, Aoki Takayuki, Watanabe Seiya, KOBAYASHI Hiromichi, NIWA Masayoshi

    Journal of Japan Society of Fluid Mechanics   42 ( 6 )   376 - 385   2023.12   （ ISSN:02863154 ）

    　More details

    Language：Japanese  

    Baseball pitchers throw a 2-seam low backspin rate “Forkball”. Recently some of them have thrown a “Gyro-forkball” including a gyro-spin with a higher spin rate. We study the aerodynamics of gyro-spin balls for 2- and 4-seam orientations by using a simulation based on the Lattice Boltzmann Method with a cumulant collision term suitable for a large-eddy simulation model. The normal Forkball has a certain lift force due to the Magnus effect by the backspin. On the other hand, the time-averaged lift forces of Gyro-forkball for both orientations are almost zero in the vertical and horizontal directions since the boundary layer separations and swirling wake behaviors are synchronized with the ball rotation. The lift forces are changing periodically in time and are canceled by the time average for one ball rotation. The vertical movement data of a Major League pitcher are in good agreement with the computational results and we have succeeded in reproducing ball trajectories similar to those of game videos.

    CiNii Research

  • 2023A-GS7-1 An Experiment on Wet-Towing Performance of a Skirt Suction Offshore Wind Turbine Foundation

    Fujino Tomohito, Hu Changhong, Watanabe Seiya, Tan Lei, Yamashita Rikizo

    Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers   37 ( 0 )   459 - 462   2023.11   （ eISSN:24241628 ）

    　More details

    Language：Japanese   Publisher：The Japan Society of Naval Architects and Ocean Engineers  

    DOI： 10.14856/conf.37.0_459

    CiNii Research

  • Coupled Lattice Boltzmann and Discrete Element Simulations of Ship-Ice Interactions

    Watanabe Seiya, Hu Changhong, Aoki Takayuki

    IOP Conference Series: Materials Science and Engineering   1288   012015   2023.8   （ ISSN:17578981 eISSN:1757899X ）

    　More details

    Evaluating ice loads acting on ships is essential for the safety of ships navigating in ice-covered seas. In this study, we develop a CFD method to handle ship, ice, and fluid interaction. The lattice Boltzmann method, capable of large-scale calculations, is applied to the simulation of free-surface fluids. The ice motion is computed by solving the equations of motion of a rigid body, and the discrete element method models the ice-ice and ice-ship contact interactions. A momentum exchange scheme couples the lattice Boltzmann method and particle-based rigid body simulation. We introduce tree-based adaptive mesh refinement and multiple GPU computing to improve grid resolution and computational time. The proposed method is applied to model scale simulations of ship navigation in a brash ice channel. Simulations were performed for various conditions with different ice concentrations and ship velocities, and we observed that ice resistance increased with the ice concentration and the ship velocity increased. The ice motions and resistances obtained from our simulations are reasonable compared to model equations of Finnish-Swedish ice class rules (FSICR) and numerical analyses of a previous study.

    CiNii Research

  • Aerodynamic Study on Shohei Otani’s Sweeper by using AMR-LBM

    YIN Yuwei, AOKI Takayuki, WATANABE Seiya, KOBAYASHI Hiromichi

    The Proceedings of The Computational Mechanics Conference   2023.36 ( 0 )   OS-0905   2023   （ eISSN:24242799 ）

    　More details

    Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

    <p>Baseball pitchers commonly throw a 2-seam low sidespin rate Slider. Recently, some have started to throw a “Sweeper”, a pitch that includes a gyro-spin with a higher spin rate. A representative example of this is the “Sweeper” thrown by Shohei Otani. We study the aerodynamics of the “Sweeper” by using the Lattice Boltzmann Method with a cumulant collision term for numerical simulation. While the conventional Slider produces a certain side force due to the Magnus effect from the sidespin, it does not generate a vertical lift force. In contrast, the “Sweeper”, which includes a gyro-spin, demonstrates a lift force in both the horizontal and vertical directions due to the asymmetry of the seams. As a result of seam asymmetry, the boundary layer separation points become asymmetrical, the wake region is obliquely lowered, and the ball experiences vertical lift force. The flight trajectory data from Shohei Otani’s pitches show good agreement with our computational results. Our findings underscore the unique aerodynamics of the “Sweeper” and the substantial influence of gyro-spin on both aerodynamics and flight trajectories.</p>

    DOI： 10.1299/jsmecmd.2023.36.os-0905

    CiNii Research

  • An ordered active parameter tracking method for efficient multiphase field simulations Reviewed International journal

    Yos Panagaman Sitompul, Takayuki Aoki, Seiya Watanabe, Tomohiro Takaki

    Journal of Computational Science   64   2022.10   （ ISSN:1877-7503 eISSN:1877-7511 ）

    　More details

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

    The multiphase field (MPF) method has been widely used for microstructural evolution and immiscible multiphase flow simulations. In this study, we have developed an ordered active parameter tracking (OAPT) method for efficient simulations of the multiple phases using the MPF method. The algorithm and performance of the OAPT method are presented and compared to those of the conventional active parameter tracking (CAPT) method. The grain growth problems were simulated for demonstration, and the results show good agreement with the conventional one and about four to seven-fold performance improvement. Moreover, we demonstrate the application of the proposed method for the multiphase flow problem, namely the turbulent bubbly downflow. The OAPT method can speed up the calculation by four folds while maintaining the original accuracy.

    DOI： 10.1016/j.jocs.2022.101834

    Web of Science

    Scopus

    researchmap

  • 2022S-GS15-1 Experimental Study of Two Interacting Tidal Turbines with Surface Wave Effects

    Watanabe Seiya, Kamra Mohamed M., Hu Changhong

    Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers   34 ( 0 )   567 - 569   2022.5   （ eISSN:24241628 ）

    　More details

    Language：Japanese   Publisher：The Japan Society of Naval Architects and Ocean Engineers  

    DOI： 10.14856/conf.34.0_567

    CiNii Research

  • 2022S-GS15-2 Wake Prediction of Tidal Current Turbines Using Machine Learning

    Kamra Mohamed M., Hu Changhong, Watanabe Seiya

    Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers   34 ( 0 )   571 - 573   2022.5   （ eISSN:24241628 ）

    　More details

    Language：English   Publisher：The Japan Society of Naval Architects and Ocean Engineers  

    DOI： 10.14856/conf.34.0_571

    CiNii Research

  • Performance Evaluation of Lattice Boltzmann Method for Fluid Simulation on A64FX Processor and Supercomputer Fugaku Reviewed International journal

    Seiya Watanabe, Changhong Hu

    HPCAsia2022: International Conference on High Performance Computing in Asia-Pacific Region   1 - 9   2022.1

    　More details

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

    DOI： https://doi.org/10.1145/3492805.3492811

    Repository Public URL： https://hdl.handle.net/2324/7183287

  • Aerodynamics study on gyro-rotating baseball using a supercomputer

    YIN Yuwei, AOKI Takayuki, WATANABE Seiya, NIWA Masayoshi, KOBAYASHI Hiromichi

    The Proceedings of the Symposium on sports and human dynamics   2022 ( 0 )   A-6-2   2022   （ eISSN:24329509 ）

    　More details

    Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

    <p>The aerodynamics of baseballs with gyro spins and their influences on the flight trajectories are studied. We use a simulation code based on Lattice Boltzmann Method with the cumulant collision term which works for a LES model. We analyze 2- and 4-seam orientations for gyro-spin balls according to the actual MLB pitches. Both results exhibit periodicity of lift forces. We also compute 2- and 4-seam orientations for back-spin according to compare them with the gyro-spin balls. In the case of back-spin balls, both exhibit longitudinal lift forces because of the magnus effect. In the case of gyro-spin, the time-averaged lift forces are almost zero. The trajectory of above 4 kinds of rotation is studied and the longitudinal displacement of the gyro-spin ball is largest among them. It is understood that aerodynamics of back-spin and gyro-spin balls are quite different, and the seam orientations have strong effects on the aerodynamic and flight trajectories.</p>

    DOI： 10.1299/jsmeshd.2022.a-6-2

    CiNii Research

  • 低スピンレートで回転する野球ボールの空力解析～フォークボールの縦の変化の解明～ Reviewed

    大橋遼河, 青木尊之, 渡辺勢也, 小林宏充

    日本流体力学会誌「ながれ」   40 ( 5 )   343 - 355   2021.10

    　More details

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

  • 弱圧縮性流体計算手法による二粒子間液架橋の数値シミュレーション Reviewed

    @吉泉瑛, @青木尊之, @松下慎太郎, @渡辺勢也, @楊開

    混相流   2021.3

    　More details

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

    DOI： https://doi.org/10.3811/jjmf.2021.004

  • 格子ボルツマン法による物体を含む自由界面流れの大規模シミュレーション Invited Reviewed

    @渡辺勢也,@青木尊之,@長谷川雄太,@河原淳,@橋本博公

    混相流   33 ( 1 )   55 - 62   2019.3

    　More details

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

    DOI： https://doi.org/10.3811/jjmf.2019.003

    Repository Public URL： https://hdl.handle.net/2324/7183270

  • GPUを用いた個別要素法による粉体シミュレーションに対するメモリ使用量を抑えた高速化手法 Reviewed

    @渡辺勢也,@青木尊之,@都築怜理

    日本計算工学会論文集   2016   2016.5

    　More details

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

    DOI： https://doi.org/10.11421/jsces.2016.20160013

    Repository Public URL： https://hdl.handle.net/2324/7183267

  • GPUによる非球形粒子を用いたDEMの大規模シミュレーション Reviewed

    @渡辺勢也,@青木尊之,@都築怜理

    粉体工学会誌   52 ( 12 )   730 - 734   2015.12

    　More details

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

    DOI： ttps://doi.org/10.4164/sptj.52.730

    Repository Public URL： https://hdl.handle.net/2324/7183261

  • 接触による粒子間相互作用のGPU計算での近傍探索手法 Reviewed

    渡辺 勢也, 青木 尊之, 都築 怜理, 下川辺 隆史

    情報処理学会論文誌コンピューティングシステム（ACS）   8 ( 4 )   50 - 60   2015.11

    　More details

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

    Repository Public URL： https://hdl.handle.net/2324/7183258

▼display all

Presentations

  • 適合格子細分化法を導入した格子ボルツマン法の大規模GPU計算 Invited

    渡辺勢也

    混相流レクチャーシリーズ48  2024.6 

    　More details

    Event date： 2024.6

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

    Venue：オンライン   Country：Japan  

  • Lattice Boltzmann Simulation of a Multi-Rotor Diffuser Augmented Wind Turbine International conference

    Seiya Watanabe

    The 2nd International Symposium on Marine Renewable Energy System Dynamics  2024.1 

    　More details

    Event date： 2024.1

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  • 格子ボルツマン法とアクチュエータラインモデルによる風車後流シミュレーション

    渡辺勢也，胡長洪

    日本流体力学会・第37回数値流体シンポジウム（CFD37）  2023.12 

    　More details

    Event date： 2023.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：名古屋   Country：Japan  

  • 物体に纏わる布周りの空力解析

    TAN HONG GUAN、青木 尊之、渡辺 勢也、岩田 真明

    日本流体力学会・第37回数値流体シンポジウム（CFD37）  2023.12 

    　More details

    Event date： 2023.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：名古屋   Country：Japan  

  • 粒子間液架橋を気液二相流で計算する水分を含んだ粉体シミュレーション

    玉木 幹太、青木 尊之、渡辺 勢也

    日本流体力学会・第37回数値流体シンポジウム（CFD37）  2023.12 

    　More details

    Event date： 2023.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：名古屋   Country：Japan  

  • 流体シミュレーションとベイズ最適化によるつば付きディフューザ風車の空力設計

    渡辺勢也，胡長洪

    第45回風力エネルギー利用シンポジウム  2023.12 

    　More details

    Event date： 2023.11 - 2023.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京   Country：Japan  

  • 格子ボルツマン法によるマルチレンズ風車のCFDシミュレーション

    吉川雅紀，渡辺勢也，胡長洪

    第45回風力エネルギー利用シンポジウム  2023.12 

    　More details

    Event date： 2023.11 - 2023.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京   Country：Japan  

  • 格子ボルツマン法による洋上ウィンドファームのラージエディシミュレーション

    渡辺勢也，胡長洪

    第45回風力エネルギー利用シンポジウム  2023.12 

    　More details

    Event date： 2023.11 - 2023.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京   Country：Japan  

  • 着床式洋上風車用スカートサクション基礎の曳航性能に関する水槽実験

    藤野智仁，胡長洪，渡辺勢也，譚雷，山下力蔵

    日本船舶海洋工学会・秋季講演会  2023.11 

    　More details

    Event date： 2023.11

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：長崎   Country：Japan  

  • マルチGPUを用いた格子ボルツマン法による大規模流体シミュレーション Invited

    渡辺勢也

    2023.11 

    　More details

    Event date： 2023.11

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • 大谷翔平投手のスイーパーの AMR-LBM による空力解析

    YIN YUWEI，青木尊之，渡辺勢也，小林宏充

    日本機械学会 第36回計算力学講演会（CMD2023）  2023.10 

    　More details

    Event date： 2023.10

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：愛知   Country：Japan  

  • Interac1on of Free-surface Flow with Driftwood for a Trap Device on a Disaster Prevention Dike International conference

    Dawai Shen, Takayuki Aoki, Seiya Watanabe

    Advances in Computa1onal Mechanics (ACM 2023)  2023.10 

    　More details

    Event date： 2023.10

    Language：English   Presentation type：Oral presentation (general)  

    Country：United States  

  • Multi-GPU lattice Boltzmann simulations of wind turbine wakes International conference

    Seiya Watanabe, Changhong Hu

    Advances in Computa1onal Mechanics (ACM 2023)  2023.10 

    　More details

    Event date： 2023.10

    Language：English   Presentation type：Oral presentation (general)  

    Country：United States  

  • Study on the Effect of Driftwood Trap Device Installed on a Dike by Using a 3D Simulation

    Dawei Shen, Takayuki Aoki, Seiya Watanabe

    2023.9 

    　More details

    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • Foam Formation Simulation with Heat Transport using Cumulant LBM with MPF model and AMR

    Yos Panagaman Sitompul, Takayuki Aoki, Seiya Watanabe, Kenta Sugihara, Tomohiro Takaki

    2023.9 

    　More details

    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • ジャイロ回転する野球ボール周りの乱流構造

    YIN YUWEI、青木尊之、渡辺勢也、小林宏充

    日本流体力学会・年会2023  2023.9 

    　More details

    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京   Country：Japan  

  • スピードスケート競技のLESによる空力解析

    瀧 優太、Tan Hong Guan、渡辺勢也、青木尊之

    日本流体力学会・年会2023  2023.9 

    　More details

    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京   Country：Japan  

  • Coupled Lattice Boltzmann and Discrete Element Simulations of Ship-Ice Interactions International conference

    Seiya Watanabe, Changhong Hu, Takayuki Aoki

    The 12th International Workshop on Ship and Marine Hydrodynamics (IWSH 2023)  2023.8 

    　More details

    Event date： 2023.8 - 2023.9

    Language：English   Presentation type：Oral presentation (general)  

    Country：Finland  

  • 縫い目のある野球ボールの空力解析

    YIN YUWEI, 青木尊之, 渡辺勢也, 丹羽政善, 小林宏充

    第55回流体力学講演会／第41回航空宇宙数値シミュレーション技術シンポジウム  2023.7 

    　More details

    Event date： 2023.7

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京   Country：Japan  

  • スピードスケート・パシュート競技のLESによる空力解析

    瀧 優太, Tan Hong Guan, 渡辺 勢也, 青木 尊之

    第55回流体力学講演会／第41回航空宇宙数値シミュレーション技術シンポジウム  2023.7 

    　More details

    Event date： 2023.7

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京   Country：Japan  

  • 布が絡まった円柱の空力解析

    TAN HONG GUAN, 青木尊之, 岩田真明, 渡辺勢也

    第55回流体力学講演会／第41回航空宇宙数値シミュレーション技術シンポジウム  2023.7 

    　More details

    Event date： 2023.7

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京   Country：Japan  

  • AMR法を導入した格子ボルツマン法による中型レンズ風車の数値シミュレーション

    #吉川雅紀，@渡辺勢也，#野間優希，@胡長洪

    第28回計算工学講演会  2023.6 

    　More details

    Event date： 2023.5 - 2023.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：つくば   Country：Japan  

  • A High-Resolution Simulation for Driftwood Capture by Using AMR-LBM

    2023.5 

    　More details

    Event date： 2023.5 - 2023.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • Heat Transfer Study in Foam Formation using LBM with MPF model and AMR method

    @Sitompul Yos,@Aoki Takayuki,@Watanabe Seiya,@Sugihara Kenta,@Takaki Tomohiro

    2023.6 

    　More details

    Event date： 2023.5 - 2023.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • スピードスケート・パシュート競技のLBMシミュレーションによる空力解析

    @瀧 優太,@Tan Hong Guan,@渡辺 勢也,@青木 尊之

    第28回計算工学講演会  2023.6 

    　More details

    Event date： 2023.5 - 2023.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：つくば   Country：Japan  

  • ジャイロ回転する野球ボールの AMR-LBMによる空力解析

    @Yin Yuwei,@青木 尊之,@渡辺 勢也,@小林 宏充,@丹羽 政善

    第28回計算工学講演会  2023.6 

    　More details

    Event date： 2023.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：つくば   Country：Japan  

  • CFDとベイズ最適化を用いたディフューザー風車の空力設計

    @渡辺勢也，#野間優希，@胡長洪

    第28回計算工学講演会  2023.6 

    　More details

    Event date： 2023.5 - 2022.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：つくば   Country：Japan  

  • Aerodynamic Design of Diffuser Augmented Wind Turbines Using 3D CFD Simulation and Bayesian Optimization International conference

    @Seiya Watanabe, @Changhong Hu, #Yuki Noma, #Masaki Yoshikawa

    Wind Energy Science Conference 2023  2023.5 

    　More details

    Event date： 2023.5

    Language：English   Presentation type：Oral presentation (general)  

    Country：United Kingdom  

  • 格子ボルツマン法とアクチュエーターラインモデルによる風車後流のLES解析 Invited

    @渡辺勢也

    第74回LES研究会  2023.5 

    　More details

    Event date： 2023.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • A 3D wide-area simulation for real river flood disaster including driftwood with high resolution mesh International conference

    Dawei Shen, Takayuki Aoki, Seiya Watanabe, Shuji Moriguchi, Shinsuke Takase, Masaaki Sakuraba

    The 11th International Conference on Multiphase Flow (ICMF 2023)  2023.4 

    　More details

    Event date： 2023.4

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  • The 11th International Conference on Multiphase Flow (ICMF 2023) International conference

    Yos P Sitompul, Takayuki Aoki, Seiya Watanabe, Kenta Sugihara, Tomohiro Takaki

    The 11th International Conference on Multiphase Flow (ICMF 2023)  2023.4 

    　More details

    Event date： 2023.4

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  • Numerical Simulation of Wind Farm by Lattice Boltzmann Method International conference

    Seiya Watanabe

    The 1st International Symposium on Marine Renewable Energy System Dynamics  2023.2 

    　More details

    Event date： 2023.2

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • CFD Investigation of a MRS with Wind Lens Turbines International conference

    Seiya Watanabe

    Multi-Rotor Seminar 2023  2023.2 

    　More details

    Event date： 2023.2

    Language：English   Presentation type：Oral presentation (general)  

    Country：Germany  

  • 格子ボルツマン法による洋上ウィンドファームの大規模シミュレーション

    渡辺勢也，胡長洪

    第36回数値流体力学シンポジウム  2022.12 

    　More details

    Event date： 2022.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • Foam Simulation with more than 1000 bubbles using LBM with MPF model and AMR method

    Sitompul Yos Panagaman, Takayuki Aoki, Seiya Watanabe, Kenta Sugihara, Tomohiro Takaki

    2022.12 

    　More details

    Event date： 2022.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • 人のランニング動作の空力解析

    TAN HONG GUAN, 青木尊之, 岩田真明, 渡辺勢也

    第36回数値流体力学シンポジウム  2022.12 

    　More details

    Event date： 2022.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • Lattice Boltzmann Simulations Using Actuator Line Model for Wind Turbine Flows International conference

    Grand RE2022 International Conference  2022.12 

    　More details

    Event date： 2022.12

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  • つば付きディフューザ風車を用いたマルチロータシステムの格子ボルツマン法による流体シミュレーション

    渡辺勢也，野間優希，胡長洪

    第44回風力エネルギー利用シンポジウム  2022.12 

    　More details

    Event date： 2022.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京   Country：Japan  

  • 格子ボルツマン法に基づく洋上ウィンドファームのLES解析コードの開発

    渡辺勢也，胡長洪

    日本機械学会第35回計算力学講演会  2022.11 

    　More details

    Event date： 2022.11

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • ジャイロ回転する野球ボールのスパコンによる空力解析

    YINYUWEI，青木尊之，渡辺勢也，丹羽政善，小林宏充

    スポーツ工学・ヒューマンダイナミクス2022  2022.11 

    　More details

    Event date： 2022.11

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：北海道   Country：Japan  

  • 気液二相流シミュレーションによる砕波・壁衝突で発生する気泡および液滴サイズ分布の統計量

    玉置 優眞, 青木尊之, Kai Yang, 松下真太郎, 渡辺勢也

    日本流体力学会年会2022  2022.9 

    　More details

    Event date： 2022.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：京都   Country：Japan  

  • Development of highly parallel LES code based on the lattice Boltzmann method for wind turbine flows International conference

    Seiya Watanabe, Changhong Hu

    International Workshop on Turbulence, Vorticity Dynamics and Wind Energy  2022.9 

    　More details

    Event date： 2022.9

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

    Country：Canada  

  • Lattice Boltzmann Simulation with Actuator Line Model for Tidal Current Turbines on Multiple GPUs International conference

    15th World Congress on Computational Mechanics (WCCM-XV) 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII)  2022.8 

    　More details

    Event date： 2022.7 - 2023.8

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  • Large-scale Simulation for a Real Driftwood Disaster by Using LBM with AMR International conference

    Dawei Shen, Takayuki Aoki, Seiya Watanabe, Shuji Moriguchi, Shinsuke Takase, Masaaki Sakuraba

    15th World Congress on Computational Mechanics (WCCM-XV) 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII)  2022.8 

    　More details

    Event date： 2022.7 - 2022.8

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  • Study on Foam Formation using Multi-phase-field Lattice Boltzmann Method with Adaptive Mesh Refinement International conference

    Yos P. Sitompul, Takayuki Aoki, Seiya Watanabe, Kenta Sugihara, Tomohiro Takaki

    15th World Congress on Computational Mechanics (WCCM-XV) 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII)  2022.8 

    　More details

    Event date： 2022.7 - 2022.8

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  • 細分化格子法を導入したキュムラント型格子ボルツマン法の富岳での性能評価

    渡辺勢也，胡長洪

    第27回計算工学講演会  2022.6 

    　More details

    Event date： 2022.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • A Large-scale Simulation for River Flood including Driftwood by Using LBM with AMR

    2022.6 

    　More details

    Event date： 2022.6

    Language：English  

    Country：Japan  

  • Development of an Improved Active Parameter Tracking Method for Efficient Multiphase Simulations usingMultiphase Field Method

    2022.6 

    　More details

    Event date： 2022.6

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  • 適合細分化格子法を導入した格子ボルツマン法によるレンズ風車の風抵抗評価

    野間優希，渡辺勢也，胡長洪

    第27回計算工学講演会  2022.6 

    　More details

    Event date： 2022.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • 波の影響を受ける2基潮流タービンの水槽実験

    渡辺勢也，胡長洪，モハメドカムラ

    令和4年 日本船舶海洋工学会 春季講演会  2022.5 

    　More details

    Event date： 2022.5 - 2021.5

    Language：Japanese  

    Venue：広島   Country：Japan  

  • A Cumulant Lattice Boltzmann Method for Free Surface Impact Pressure Prediction International conference

    Seiya Watanabe

    The 2nd International Symposium on Novel Computational and Experimental Methods for Complicated Fluid Structure Interactions  2021.1 

    　More details

    Event date： 2021.6

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  • 格子ボルツマン法による水波のシミュレーション

    渡辺勢也, 胡長洪

    令和2年日本船舶海洋工学会春季講演会  2020.5 

    　More details

    Event date： 2021.6

    Language：Japanese  

    Country：Japan  

  • A Simulation of Violent Flag Fluttering using Cumulant LBM and Direct Forcing IBM

    Tada Eric, Watanabe Seiya, Yamaguchi Daiki, Aoki Takayuki

    2020.6 

    　More details

    Event date： 2021.6

    Language：Japanese  

    Country：Japan  

  • AMR法を用いたCumulant-LBMによる回転移動を伴う野球ボールの空力解析

    大橋遼河, 渡辺勢也, 青木尊之, 佐山将太朗, 田中博人

    第25回計算工学講演会  2020.6 

    　More details

    Event date： 2021.6

    Language：Japanese  

    Country：Japan  

  • AMR法を導入したイルカの自由遊泳

    山口大輝, 渡辺勢也, 青木尊之, 田中博人

    第25回計算工学講演会  2020.6 

    　More details

    Event date： 2021.6

    Language：Japanese  

    Country：Japan  

  • 弱圧縮性流体計算手法による二粒子間液架橋の数値シミュレーション

    吉泉 瑛, 青木 尊之, 松下 真太郎, 渡辺 勢也, Yang Kai

    混相流シンポジウム2020  2020.8 

    　More details

    Event date： 2021.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • 回転するハイスピード野球ボールの空力特性における縫い目の影響のCFD解析

    大橋 遼河, 渡辺 勢也, 青木 尊之

    日本流体学会年会2020  2020.9 

    　More details

    Event date： 2021.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • 実際のイルカの動きを考慮した自由遊泳の大規模数値シミュレーション

    山口 大輝, 渡辺 勢也, 青木 尊之

    日本流体学会年会2020  2020.9 

    　More details

    Event date： 2021.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • 流木を含む津波に対する防潮林の大規模シミュレーション

    渡辺 勢也, 河原 淳, 青木 尊之, 杉原 健太, 高瀬 慎介, 森口 周二, 橋本 博公

    日本流体学会年会2020  2020.9 

    　More details

    Event date： 2021.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • 格子ボルツマン法に基づく流体-構造連成解析ソルバーの開発

    渡辺勢也，胡長洪

    第17回推進・運動性能研究会  2020.10 

    　More details

    Event date： 2021.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • Simulation of Wave Impact Problem Using Lattice Boltzmann Method

    Seiya Watanabe, Shintaro Fujisaki, Changhong Hu

    2020.11 

    　More details

    Event date： 2021.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • 野球における変化球の軌道再現に向けた数値シミュレーション

    大橋 遼河, 渡辺 勢也, 青木 尊之

    スポーツ工学・ヒューマンダイナミクス2020  2020.11 

    　More details

    Event date： 2021.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • 適合細分化格子を用いたCumulant LBMによる球周りの流れの高解像度計算

    渡辺 勢也, 大橋 遼河, 青木 尊之

    第34回数値流体力学シンポジウム  2020.12 

    　More details

    Event date： 2021.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • Simulations of free-surface flows including driftwoods for evaluating disaster-reduction of a tide-protection forest International conference

    Seiya Watanabe, Jun Kawahara, Takayuki Aok

    COMPSAFE2020  2020.12 

    　More details

    Event date： 2021.6

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  • MPF法による動的負荷分散の気液二相流AMR計算への適用と性能評価

    渡辺勢也, 青木尊之, 松下真太郎, 胡長洪, 高木知弘

    第25回計算工学講演会  2020.6 

    　More details

    Event date： 2020.6 - 2021.6

    Language：Japanese  

    Country：Japan  

  • 混合界面における超臨界流体の物質輸送に関する分子動力学解析

    渡辺勢也、矢口久雄

    日本混相流学会・混相流シンポジウム2014  2014.7 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：札幌  

  • GPUによる近接相互作用に基づく粒子計算の近傍探索手法

    渡辺勢也、青木尊之、都築怜理、下川辺隆史

    第22回ハイパフォーマンスコンピューティングとアーキテクチャの評価に関する北海道ワークショップ  2014.12 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：小樽  

  • 非球形粒子を用いた個別要素法による大規模粉体シミュレーション

    渡辺勢也、青木尊之、都築怜理

    粉体工学会・2015 年度春期研究発表会  2015.5 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：連合会館　(東京都千代田区神田駿河台3-2-11)  

  • GPUを用いた個別要素法計算における近傍探索手法の比較評価

    渡辺勢也、青木尊之、都築怜理、下川辺隆史

    第20回計算工学講演会  2015.6 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：つくば国際会議場（つくば）  

  • 接触相互作用に基づく粒子法のGPU計算におけるメモリアクセスの改善による高速化

    渡辺勢也、青木尊之、都築怜理

    第149回ハイパフォーマンスコンピューティング研究発表会  2015.6 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：工学院大学（東京）  

  • Large-scale DEM Simulations using Non-spherical Elements on GPU International conference

    Seiya Watanabe, Takayuki Aoki, Satori Tsuzuki

    PARTICLES2015  2015.9 

    　More details

    Language：English   Presentation type：Oral presentation (general)  

  • GPUによる実形状粉粒体モデルを用いた大規模 DEM シミュレーション

    渡辺勢也、青木尊之、都築怜理

    日本機械学会　第２８回計算力学講演会（CMD２０１５）  2015.10 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：横浜国立大学（横浜）  

  • LBM-DEM固液二相流のGPU計算

    渡辺勢也、青木尊之、長谷川雄太

    第29回数値流体力学シンポジウム  2015.12 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：九州大学　筑紫キャンパス  

  • Large-Scale Simulations for Fluid-particle System Using Multiple GPUs International conference

    S. Watanabe, T. Aoki, Y. Hasegawa

    Parallel CFD 2016  2016.5 

    　More details

    Language：English   Presentation type：Oral presentation (general)  

  • 非球形固体粒子と流体の直接相互作用による混相流の大規模シミュレーション

    渡辺勢也、青木尊之、長谷川雄太

    粉体工学会春季研究発表会  2016.5 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：京都，京都リサーチパーク  

  • 舞い落ちる多数のイチョウの葉のシミュレーション

    渡辺勢也、青木尊之、長谷川雄太

    日本計算工学会　第２１回計算工学講演会  2016.5 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：新潟，朱鷺メッセ：新潟コンベンションセンター  

  • Large-scale Simulations for Fluidization using Coupled Lattice Boltzmann Method and Discrete Element Method on a GPU Supercomputer. International conference

    S. Watanabe, T. Aoki, Y. Hasegawa

    ECCOMAS Congress 2016  2016.6 

    　More details

    Language：English   Presentation type：Oral presentation (general)  

  • LBM-DEM の直接相互作用計算による流動層の大規模シミュレーション

    渡辺勢也、 青木尊之、 長谷川雄太

    日本機械学会第29回計算力学講演会(CMD2016)  2016.9 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：名古屋, 名古屋大学  

  • 流体ー固体粒子間相互作用の直接計算による大規模流動化シミュレーション

    渡辺勢也、青木尊之、長谷川雄太

    第22回流動化・粒子プロセッシングシンポジウム  2016.12 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京大学生産技術研究所（東京）  

  • 格子ボルツマン法による舞い落ちるイチョウの葉の大規模流体-構造連成シミュレーション

    渡辺勢也、青木尊之、長谷川雄太

    第30回数値流体力学シンポジウム  2016.12 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：タワーホール船堀（東京）  

  • 非球形粒子を含む流動層の大規模直接シミュレーション

    渡辺勢也、青木尊之、長谷川雄太

    粉体工学会2017年春季研究発表会  2017.5 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：早稲田大学国際会議場  

  • 流体-粒子間相互作用の直接計算に基づく非球形粒子を含む流動層シミュレーション

    渡辺勢也、青木尊之、長谷川雄太

    第22回計算工学講演会  2017.6 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：埼玉, 大宮ソニックシティ  

  • A large-scale LBM-DEM simulation based on direct calculation of fluid-solid interactions using multiple GPUs International conference

    Seiya Watanabe, Takayuki Aoki, Yuta Hasegawa

    COUPLED PROBLEMS 2017  2017.6 

    　More details

    Language：English   Presentation type：Oral presentation (general)  

  • Large-Scale Simulations For Multiphase Flows By Coupled LBM-DEM Using Multiple GPUs International conference

    Seiya Watanabe, Takayuki Aoki, Yuta Hasegawa

    DSFD2017  2017.7 

    　More details

    Language：English   Presentation type：Oral presentation (general)  

  • 自由界面流れと固体粒子の連成シミュレーション

    渡辺勢也，青木尊之，長谷川雄太，松下真太郎

    混相流シンポジウム2017  2017.8 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京，電気通信大学  

  • Phasefield法による界面捕獲手法を用いた自由界面流れと固体粒子の連成解析

    渡辺勢也，青木尊之，長谷川雄太，松下真太郎

    第30回計算力学講演会  2017.9 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：大阪，近畿大学  

  • Large-scale Simulations for Fluid-particle Systems Using Coupled LBM-DEM on a GPU Supercomputer International conference

    Seiya Watanabe, Takayuki Aoki, Yuta Hasegawa

    PARTICLES2017  2017.9 

    　More details

    Language：English   Presentation type：Oral presentation (general)  

  • 格子ボルツマン法を用いた浮遊物体を含む自由界面流れのシミュレーション

    渡辺勢也, 青木尊之, 長谷川雄太

    第31回数値流体力学シンポジウム  2017.12 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：京都工芸繊維大  

  • マルチフェーズフィールド法に基づく領域分割を用いたAMR計算の動的負荷分散

    渡辺勢也, 青木尊之, 黄遠雄, 長谷川雄太, 高木知弘

    第23回計算工学講演会  2018.6 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：名古屋, 愛知県産業労働センター ウインクあいち  

  • Simulations of Free Surface Flows Interacting with Solid Objects by Lattice Boltzmann Method Using Multiple GPUs International conference

    Seiya Watanabe, Takayuki Aoki, Yuta Hasegawa

    ECCM-ECFD 2018  2018.6 

    　More details

    Language：English   Presentation type：Oral presentation (general)  

  • GPU-accelerated Lattice Boltzmann Simulations with Octree-based Dynamic AMR Method International conference

    Seiya Watanabe, Takayuki Aoki, Yuta Hasegawa

    DSFD2018  2018.6 

    　More details

    Language：English   Presentation type：Oral presentation (general)  

  • 多数の瓦礫を含んだ津波が構造物へ与える影響の数値解析

    渡辺勢也，青木尊之，長谷川雄太，河原淳

    混相流シンポジウム2018  2018.8 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：仙台，東北大学  

  • AMR法を導入した格子ボルツマン法による大規模流体構造連成解析

    渡辺勢也，青木尊之，長谷川雄太

    日本流体力学会　年会2018  2018.9 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：大阪，大阪大学  

  • AMR法の動的領域分割へのマルチフェーズフィールド法の適用

    渡辺勢也，青木尊之，松下真太郎，Christian Conti，高木知弘

    第31回計算力学講演会  2018.11 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：徳島・徳島大学  

  • 動的AMR法を導入した格子ボルツマン法の複数GPUによる大規模計算

    渡辺勢也，青木尊之，長谷川雄太

    第31回計算力学講演会  2018.11 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：徳島・徳島大学  

  • GPUスパコンにおける動的負荷分散を用いたAMR法による大規模LBM計算

    渡辺勢也，青木尊之，長谷川雄太

    第32回数値流体力学シンポジウム  2018.12 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京，機械振興会館  

  • AMR法を導入した格子ボルツマン法を用いた噴流によるピンポン玉の浮遊シミュレーション

    渡辺勢也，青木尊之，Yang Kai，小林宏充

    第24回計算工学講演会  2019.5 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：埼玉, 大宮ソニックシティ  

  • Large-scale Simulations of Free-surface Flows Using Lattice Boltzmann Method with Block-structured Adaptive Mesh Refinement International conference

    Seiya Watanabe, Takayuki Aoki

    ASCHT2019  2019.9 

    　More details

    Language：English   Presentation type：Oral presentation (general)  

  • 界面に適合するAMR法を用いた自由界面流れの大規模GPU計算

    渡辺勢也，青木尊之

    第32回計算力学講演会（CMD2019）  2019.9 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：埼玉，東洋大学  

  • 適合細分化格⼦ボルツマン法を⽤いた噴流により浮遊するピンポン⽟のシミュレーション

    渡辺勢也，青木尊之，小林宏光

    第33回数値流体力学シンポジウム  2019.11 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：北海道大学，北海道  

  • Multi-GPU Computing of Free-surface Flows Using Adaptively Mesh-refined LBM International conference

    Seiya Watanabe, Takayuki Aoki

    APCOM2019  2019.12 

    　More details

    Language：English   Presentation type：Oral presentation (general)  

  • A64FXプロセッサにおける格子ボルツマン法の性能測定とチューニング

    渡辺勢也，胡長洪

    第26回計算工学講演会  2021.5 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • 波の影響を考慮した２基潮流タービンの水槽実験

    胡長洪，福島総士，モハメドカムラ，渡辺勢也，野田穣士郎

    令和3年 日本船舶海洋工学会 春季講演会  2021.5 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • ダムブレイク問題におけるゲートの影響に関する数値的研究

    渡辺勢也，胡長洪

    令和3年 日本船舶海洋工学会 春季講演会  2021.5 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • AMR法を導入した薄板変形の流体構造連成シミュレーション

    山口大輝、青木尊之、渡辺勢也

    第26回計算工学講演会  2021.5 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • Liquid-gas Foam Simulations using Cumulant Lattice Boltzmann Method with Adaptive Mesh Refinement

    2021.5 

    　More details

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  • A Large-scale Simulation of Driftwood Disaster by Using LBM with AMR

    2021.5 

    　More details

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  • A Domain Decomposition Method based on a Multi-phase-field Model to Reduce Inter-node Communication International conference

    Seiya Watanabe, Takayuki Aoki, Changhong Hu, Shintaro Matsushita, Tomohiro Takaki

    Parallel CFD 2021  2021.5 

    　More details

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  • 自由表面流れに対するAMR法を導入したLBMコードの開発と海洋工学への適用

    渡辺勢也

    第33回LBM研究会  2021.6 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • A Large-scale Foam Simulation using a Multi-phase field Lattice Boltzmann Method with Adaptive Mesh Refinement

    2021.9 

    　More details

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  • Actuator Line モデルを用いた格子ボルツマン法による潮流タービンのシミュレーション

    渡辺勢也，胡長洪，後藤優弥

    令和3年 日本船舶海洋工学会 秋季講演会  2021.11 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • Foam Simulation with a Large Number of Bubbles using Multi-phase LBM and Adaptive Mesh Refinement

    Sitompul Yos, Aoki Takayuki, Watanabe Seiya, Sugihara Kenta, Takaki Tomohiro

    2021.12 

    　More details

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  • 回転する野球ボールの空力解析　－フォークボールの落ちる謎の解明－

    青木尊之, 大橋 遼河, 渡辺勢也, 小林 宏充

    日本流体力学会第35回数値流体力学シンポジウム  2021.12 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • AMR法を導入した格子ボルツマン法による船舶-氷相互作用のシミュレーション

    渡辺勢也, 胡 長洪, 青木尊之

    日本流体力学会第35回数値流体力学シンポジウム  2021.12 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • 水分を含んだ粉体の直交格子ベース流動シミュレーション

    狹間貴一, 吉泉 瑛, 青木尊之 , 渡辺勢也

    日本流体力学会第35回数値流体力学シンポジウム  2021.12 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • Lattice Boltzmann Simulation Using Actuator Line Model for Tidal Current Turbines Invited International conference

    Seiya Watanabe

    CMHL2022  2022.1 

    　More details

    Language：English   Presentation type：Oral presentation (general)  

    Country：China  

  • Performance Evaluation of Lattice Boltzmann Method for Fluid Simulation on A64FX Processor and Supercomputer Fugaku International conference

    Seiya Watanabe, Changhong Hu

    HPCAsia2022  2022.1 

    　More details

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  • 格⼦ボルツマン法に基づく潮流発電タービンのシミュレーション技術の開発

    渡辺勢也，胡長洪

    第21回推進・運動性能研究会  2022.3 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

▼display all

Professional Memberships

  • 日本風力エネルギー学会

    2022.12 - Present

    　 More details

  • 日本船舶海洋工学会

    2020.3 - Present

    　 More details

  • 日本機械学会

    2016.8 - Present

    　 More details

  • 日本計算工学会

    2015.3 - Present

    　 More details

  • The Japan Society of Mechanical Engineers

  • The Japan Society for Computational Engineering and Science

  • The Japan Society of Naval Architects and Ocean Engineers

  • Japan Wind Energy Association

▼display all

Academic Activities

  • オーガナイズドセッション　オーガナイザー

    第28回計算工学講演会  （ つくば国際会議 ） 2023.5 - 2023.6

    　More details

    Type：Competition, symposium, etc. 

  • Session chair International contribution

    ADVANCES IN COMPUTATIONAL MECHANICS (ACM 2023)  （ The University of Texas at Austin UnitedStatesofAmerica ） 2023.4 - 2024.4

    　More details

    Type：Competition, symposium, etc. 

  • Screening of academic papers

    Role(s)： Peer review

    2023

    　More details

    Type：Peer review 

    Number of peer-reviewed articles in foreign language journals：5

    Number of peer-reviewed articles in Japanese journals：3

    Proceedings of International Conference Number of peer-reviewed papers：0

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

  • オーガナイズドセッション　オーガナイザー

    第27回計算工学講演会  （ にぎわい交流館AU（秋田県秋田市）およびオンライン ） 2022.6

    　More details

    Type：Competition, symposium, etc. 

  • 講演会実行委員会

    令和4年日本船舶海洋工学会春季講演会  （ 広島国際会議場およびオンライン ） 2022.5

    　More details

    Type：Competition, symposium, etc. 

  • Screening of academic papers

    Role(s)： Peer review

    2022

    　More details

    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：0

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

  • オーガナイズドセッション　オーガナイザー

    第26回計算工学講演会  （ オンライン ） 2021.5

    　More details

    Type：Competition, symposium, etc. 

  • Screening of academic papers

    Role(s)： Peer review

    2021

    　More details

    Type：Peer review 

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

    Number of peer-reviewed articles in Japanese journals：1

    Proceedings of International Conference Number of peer-reviewed papers：0

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

  • 講演会実行委員

    令和2年日本船舶海洋工学会秋季講演会  （ オンライン ） 2020.11

    　More details

    Type：Competition, symposium, etc. 

  • オーガナイズドセッション　オーガナイザー

    第25回計算工学講演会  （ 北九州国際会議場 ） 2020.6

    　More details

    Type：Competition, symposium, etc. 

▼display all

Research Projects

  • 洋上ウィンドファームの発電量予測のための高性能CFDツールの開発

    Grant number：22K14181  2022 - 2023

    日本学術振興会  科学研究費助成事業  若手研究

    渡辺 勢也

    　 More details

    Authorship：Principal investigator  Grant type：Scientific research funding

    洋上ウィンドファームの発電量予測には、各風車が形成するウェイクが後続の風車に与える影響を精度よく評価することが重要な課題である。本研究では、大規模CFDに適した格子ボルツマン法を用いることで、従来よりも高い格子解像度、かつ少ない計算リソースで洋上ウィンドファームを解析可能な高性能CFDツールの開発と発電量予測性能の向上を目的とする。風車ブレードを点群で表現するアクチュエータラインモデルを格子ボルツマン法に適用する。気象モデルと格子ボルツマン法をデータ同化により連携し、現実的な風況を再現する。風況を変えた様々な条件下の解析を実施し、開発ツールの有用性を示す。

    CiNii Research

  • Innovative CFD simulation for multiphase flows including free surfaces

    Grant number：19H05613  2020 - 2023

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (S)

    　 More details

    Authorship：Coinvestigator(s)  Grant type：Scientific research funding

    CiNii Research

  • 固気液混相流のエクサスケール直接シミュレーション

    2017 - 2018

    日本学術振興会  特別研究員

    　 More details

    Grant type：Joint research