Kyushu University [Mitsuteru Asai (Associate Professor) Faculty of Engineering, ]

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Mitsuteru Asai
Associate Professor
Structural and Earthquake Engineering
Faculty of Engineering
Last modified date：2024.04.21

Graduate School

Department of Civil and Structural Engineering
Graduate School of Engineering

Undergraduate School

Department of Earth Resources,Marine and Civil Engineering
School of Engineering

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Total Priod of education and research career in the foreign country

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1.	♯Shota Deguchi, Mitsuteru Asai, Dynamic & norm-based weights to normalize imbalance in back-propagated gradients of physics-informed neural netwroks, Journal of Physics Communications, 10.1088/2399-6528/ace416, 7, 7, 2023.06.
2.	Yifang Qin, Shunhua Chen, Mitsuteru Asai, A nodal-based Lagrange multiplier/cohesive zone approach for three-dimensional dynamic crack simulations of quasi-brittle materials, Engineering Fracture Mechanics, https://doi.org/10.1016/j.engfracmech.2023.109637, 2023.09.
3.	Daniel Morikawa, Mitsuteru Asai, Surface tension simulations with corrected ALE-ISPH and density-based shifting technique, COMPUTATIONAL PARTICLE MECHANICS, https://doi.org/10.1007/s40571-023-00666-y, 2023.10.
4.	Mitsuteru Asai, Shujiro Fujioka, Yusuke Saeki, Daniel Morikawa Shigueo, Kumpei Tsuji, A class of second derivatives in the Smoothed Particle Hydrodynamics with 2nd-order accuracy and its application to incompressible flow simulations, Computer Method in Applied Mechanics and Engineering, https://doi.org/10.1016/j.cma.2023.116203, 415, 2023.10.
5.	Kumpei Tsuji, Mitsuteru Asai, Kiyonobu Kasama, Seepage failure prediction of breakwater using an unresolved ISPH-DEM coupling method enriched with Terzaghi’s critical hydraulic gradient, Advanced Modeling and Simulation in Engineering Sciences, https://doi.org/10.1186/s40323-022-00239-3, 10, 2023.01.
6.	Daniel Shigueo Morikawa, Kumpei Tsuji, Mitsuteru Asai, Corrected ALE-ISPH with novel Neumann boundary condition and density-based particle shifting technique, Journal of Computational Physics: X, https://doi.org/10.1016/j.jcpx.2023.100125, 17, 2023.03.
7.	Daniel S. Morikawa, Mitsuteru Asai, A phase-change approach to landslide simulations: Coupling finite strain elastoplastic TLSPH with non-Newtonian IISPH, COMPUTERS AND GEOTECHNICS, 10.1016/j.compgeo.2022.104815, 148, 2022.08, The present work shows a novel phase-change concept for simulating landslides using the smoothed particles hydrodynamics (SPH) method. The idea is to initiate the simulation of a slope stability problem with a Solid Mechanics-based SPH, modeling the soil as an elastoplastic material at finite strain. Next, if a particle exceeds a certain level of plastic strain, such particle changes its phase to a fluid state with non-Newtonian rheology, which is then solved with a Fluid Dynamics-based SPH method. We use the total Lagrangian SPH (TLSPH) method to solve the Solid Mechanics phase to avoid problems related to particle distribution (such as the tensile instability), while the implicit incompressible SPH (IISPH) to solve the Fluid Dynamics part to avoid the restriction on time increment in relation to high values of viscosity. The coupling between the two phases is treated as a conventional fluid-solid interaction (FSI) problem. We verified the proposed TLSPH method with the triaxial compression problem and demonstrated the robustness of the proposed phase-change TLSPH-IISPH coupled method in the simulation of the Aso landslide. Specifically, it may be the first time to simulate the Aso landslide from its initiation to its propagation in a single numerical simulation..
8.	Daniel S. Morikawa, Mitsuteru Asai, Soil-water strong coupled ISPH based on u-w-p formulation for large deformation problems, Computers and Geotechnics, https://doi.org/10.1016/j.compgeo.2021.104570, 2022.02, 豪雨時の斜面崩壊など、地盤における水と土の連成問題の予測が求められている。粒子法の一つであるISPH法は、これまで主に水のみを対象とした解析技術として発展してきたが、この解析手法の拡張し、水と土の連成現象を強連成の定式化で解析できる手法を構築した。.
9.	Daniel S. Morikawa, Mitsuteru Asai, Soil-water strong coupled ISPH based on u - w - p formulation for large deformation problems, COMPUTERS AND GEOTECHNICS, 10.1016/j.compgeo.2021.104570, 142, 2022.02, This paper is dedicated to the introduction of a strong coupled soil-water interaction formulation based on an incompressible smoothed particle hydrodynamics (ISPH) framework. The method is based on the u-w-p Biot's formulation and adapted to a semi-implicit projection method for incompressibility condition of pore water and soil grains. The SPH Lagrangian particles move according to the soil velocity, while water variables are embedded into such soil particles. This allows to solve the pressure Poisson equation in a strong coupling way, in addition to enable to update the Darcy's drag force implicitly. A simple boundary treatment on natural boundary conditions for soil particle is proposed to take into account both non-penetration and friction effects. The proposed method was verified and validated through a series of numerical tests resulting in good agreements with both theoretical and experimental results. Finally, we show the applicability of the proposed method in the famous Selborne experiment, a full-scale slope failure problem..
10.	Daniel S. Morikawa, Mitsuteru Asai, Coupling total Lagrangian SPH-EISPH for fluid-structure interaction with large deformed hyperelastic solid bodies, Computer Method in Applied Mechanics and Engineering, https://doi.org/10.1016/j.cma.2021.113832, 2021.08, 粒子法による流体構造連成解析をする際，特に構造解析の大変形解析が不安定になり，ロバストに解析が実施することが困難であった。そこで、超弾性体モデルの範囲内であれば、初期配置と現配置の間に1対1の関係があることを利用し、固体のつり合い問題を初期配置で解くTotalラグランジュ記述によるSPH粒子法を利用した新しい流体構造連成解析法を提案した。.
11.	Daniel S. Morikawa, Mitsuteru Asai, Coupling total Lagrangian SPH-EISPH for fluid-structure interaction with large deformed hyperelastic solid bodies, COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING, 10.1016/j.cma.2021.113832, 381, 113832-113832, 2021.08, In this work, we propose a two-way coupling technique between a total Lagrangian smoothed particle hydrodynamics (SPH) method for Solid Mechanics and the explicit incompressible SPH (EISPH) to simulate fluid-structure interaction problems. In the solid part, the total Lagrangian framework guarantees that the particle distribution keep stable to correctly calculate the deformation gradient and thus the elastic forces. The constitutive model follows hyperelastic formulations, and the stability of the method is enforced by a Jameson-Schmidt-Turkel (JST) stabilization procedure. For the fluid part, we applied an EISPH formulation, which is a fully explicit incompressible scheme based on a projection method capable of providing accurate pressure distributions for free-surface flows, while avoiding costly linear equations. The coupling scheme follows the same manner as the fixed wall ghost particle (FWGP) approach, which was here adapted to include moving walls. In addition, the non-penetration condition is rigorously reinforced through a numerical algorithm to avoid penetration of every fluid particle, including free-surface particles. Our method for solid is then verified through a large deformed tension plate numerical test, and our coupling forces through a series floating tests and hydrostatic water column over a thin infinite plate. Then, the method is validated comparing it with experimental data of a dam break test in which the water column attacks a thin rubber plate. (C) 2021 Elsevier B.V. All rights reserved..
12.	Daniel Morikawa, Harini Senadheera, Mitsuteru Asai, Explicit incompressible smoothed particle hydrodynamics in a multi-GPU environment for large-scale simulations, COMPUTATIONAL PARTICLE MECHANICS, 10.1007/s40571-020-00347-0, 8, 3, 493-510, 2021.05, © 2020, OWZ. We present an explicit incompressible smoothed particle hydrodynamics formulation with stabilized pressure distribution and its implementation in a multiple graphics processing unit environment. The pressure Poisson equation is stabilized via both pressure invariance and divergence-free conditions, and its explicit formulation is derived using the first step of the Jacobi iterative solver. Also, we show how to adapt the fixed wall ghost particle for the boundary condition into our explicit approach. Verification and validation of the method include hydrostatic and dam break numerical tests. The computational performance in the multi-GPU environment was notably high with reasonable speedup values compared to our single-GPU implementation. In particular, our code allows simulations with very large number of particles reaching up to 200 million per GPU card. Finally, to illustrate the potential of our formulation in simulating natural disasters, we present a simulation of the famous Fukushima Dai-ichi Power Plant inundation by the tsunami from The Great East Japan Earthquake in 2011, in Japan..
13.	Mitsuteru Asai, Yi Li, Bodhinanda Chandra, Shinsuke Takase, Fluid–rigid-body interaction simulations and validations using a coupled stabilized ISPH–DEM incorporated with the energy-tracking impulse method for multiple-body contacts, Computer Methods in Applied Mechanics and Engineering, 10.1016/j.cma.2021.113681, 377, 113681-113681, 2021.04, © 2021 The Author(s) In this paper, a new particle-based fluid–rigid-body interaction simulator for violent free-surface flow problems is developed. The incompressible Smoothed Particle Hydrodynamics (ISPH) method has been proven to produce a smooth and accurate pressure distribution of free-surface fluid flow with breaking and fragmentation. Computed hydrodynamic forces can be applied onto rigid bodies, which may simultaneously experience contact or impact with the surrounding wall boundaries or another rigid body. Modeled by using the discrete element method (DEM), the contact force between rigid bodies is traditionally calculated employing the penalty approach, where a spring-based repulsive force is approximated at the vicinity of contact points depending on the deepest penetration depth. However, for high-speed collision problems involving a system of many rigid bodies, the values of approximated repulsive forces may be highly overestimated, and thus, a much smaller time step and an excessive damping parameter are often required to stabilize the approximated forces. This problem is highly inefficient for the computational resources of the fluid–rigid body interaction simulation since the computational cost at each time step is mostly dominated by the incompressible fluid simulation. The capability to increase the time increment following the critical time step of the fluid solver is, therefore, strongly demanded to increase the simulation efficiency. The current paper incorporates the usage of the energy-tracking impulse (ETI) method as an alternative approach to handle contact accurately. To achieve better energy conservation and enhance stability, Stronge's hypothesis is considered instead of the generally assumed Newton's contact law. The current work also covers three experimental validation tests, which were conducted to assure the quality and robustness of the coupled ISPH–DEM implementation..
14.	Yi Li, Mitsuteru Asai, Bodhinanda Chandra, Masaharu Isshiki, Energy-tracking impulse method for particle-discretized rigid-body simulations with frictional contact, COMPUTATIONAL PARTICLE MECHANICS, 10.1007/s40571-020-00326-5, 8, 2, 237-258, 2021.03, © 2020, OWZ. Simulations of multi-body dynamics for computer graphics, 3D game engines, or engineering simulations often involve contact and articulated connections to produce plausible results. Multi-body dynamics simulations generally require accurate contact detection and induce high computational costs because of tiny time increments. As higher accuracy and robustness are continually being sought for engineering purposes, we propose an improved multi-body dynamics simulator based on an impulse method, specifically an energy-tracking impulse (ETI) algorithm that has been modified to handle particle-discretized rigid-body simulations. In order to decrease the computational costs of the simulations, in the current work, we assume a fixed moderate time increment, allowing multiple-point contacts within a single time increment. In addition to that, we distinguish the treatment between point-to-point and multiple-point contacts, which include edge-to-surface and surface-to-surface contacts, through an additional sub-cycling iterations. The improved ETI method was verified with analytical solutions of examples with single-body contact, a frictional slip, and a rolling contact. Moreover, the method was also validated with an experimental test of a line of dominoes with multiple-point contacts. Finally, a demonstration simulation with bodies of complicated shape subjected to a large number of constraints is given to show the optimum performance of the formulation..
15.	Li Yi, Mitsuteru Asai, Bodhinanda Chandra, Masaharu Isshiki, Energy-tracking impulse method for particle-discretized rigid-body simulations with frictional contact, Journal of Computational Particle Mechanics, https://doi.org/10.1007/s40571-020-00326-5, 2020.04, 剛体接触解析を行う常套手段としては、バネとダッシュポットで簡易的に表現するペナルティ法が良く採用されるが、時間増分が小さくなる、また人工パラメータの設定方法が曖昧であるなどの、問題点があった。そこで、適切な力（撃力：インパルス）で接触を表現するインパルス法に着目し、特にエネルギー保存性を担保できるEnergy-tracking impulse法をベースとし、これをDEMなどの粒子離散化された剛体の解析へと適用した。.
16.	Estimation on collapse mechanism of Aso-bridge during the 2016 Kumamoto earthquakes using ASI-Gauss code Many bridges and infrastrucutures were damaged by the seismic waves in the 2016 Kumamoto Earthquakes, and in this research, we focused on the Aso-bridge which collapsed immediately after the main shock. A huge landslide happened after the earthquakes and Aso-bridge, which was constructed in the same location of the landslide, totally collapsed. There are a couple of reports that four main factors might have contributed to this collapse; (1) seismic wave, (2) ground deformation, (3) landslide material load increase on the bridge, (4) basement ground collapse. In this paper, a numerical analysis of the Aso-Bridge collapse was conducted using the ASI-Gauss code, which is one of the finite element method utilizing beam elements. Then, we have discussed the main factor of the Aso-bridge collapse. .
17.	SPH-DEM COUPLING SIMULATION WITH A LIQUID BRIDGE FORCE FOR THE REPRESENTATION OF GROUND COLLAPSE PHENOMENON Recently, the ground collapse caused by deterioration of sewer pipes, which is constructed during the period of high economic growth, has occurred frequently. In this study, 3-dimensional numerical analysis is conducted to understand the mechanism of ground collapse. As an analysis method, we developed a fluidsoil multi-phase flow analysis method based on particle method that can follow large deformation and discontinuous motion. By introducing the liquid bridging force, which has been studied in the field of powder engineering, the apparent cohesion due to water content was taken into consideration and improvements were made to adapt to unsaturated ground. We succeeded in reproducing the qualitative collapse phenomenon by the analysis of the depression phenomenon using this method. .
18.	Daniel Morikawa, Mitsuteru Asai, NurAin Idris, Yusuke Imoto, Masaharu Isshiki, Improvements in highly viscous fluid simulation using a fully implicit SPH method, COMPUTATIONAL PARTICLE MECHANICS, 10.1007/s40571-019-00231-6, 6, 4, 529-544, 2019.10, © 2019, OWZ. This study describes the application of two main improvements in highly viscous fluid simulations using the smoothed particle hydrodynamics (SPH) method: an implicit time integration scheme to overcome the problem of impractically small time step restriction and the introduction of air ghost particles to fix problems regarding the free surface treatment. This study adopts the incompressible SPH as a basis for the implementation of these improvements, which guarantees a stable and accurate pressure distribution. We verified the proposed implicit time integration scheme with simulations of pipe flow and the free surface treatment with a simple hydrostatic problem. As a result, the free surface of the hydrostatic problem became very smooth and stable. In addition, we conducted a variety of dam-break simulations to validate this proposed SPH method, as well as to analyze the density and divergence error. Finally, we demonstrate the potential of this method with the highly viscous vertical jet flow over a horizontal plate test, which features a complex viscous coiling behavior..
19.	Daniel Morikawa, Mitsuteru ASAI, Nur' Ain Idris, Yusuke Imoto, Masaharu Isshiki, Improvement in highly viscous fluid simulation using a fully implicit SPH method, Journal of Computational Particle Mechanics, 10.1007/s40571-019-00231-6, 2019.03, 土石流あるいは火砕流などの災害シミュレーションへ向けた高粘性流体のシミュレーションのために、独自に開発してきた粒子法（ISPH法）を改良し、安定かつ高精度に解析可能な手法を開発した。.
20.	Daniel Morikawa, Mitsuteru Asai, Nur’Ain Idris, Yusuke Imoto, Masaharu Isshiki, Improvements in highly viscous fluid simulation using a fully implicit SPH method, Computational Particle Mechanics, 10.1007/s40571-019-00231-6, 6, 4, 1-16, 2019.03, This study describes the application of two main improvements in highly viscous fluid simulations using the smoothed particle hydrodynamics (SPH) method: an implicit time integration scheme to overcome the problem of impractically small time step restriction and the introduction of air ghost particles to fix problems regarding the free surface treatment..
21.	Masao OGINO, Takyuya IWAMA, Mitsuteru ASAI, Development of an ISPH-FEM Weak Coupling Analysis System for 3-dimensional Fluid-Structure Interaction Problems, Teroretical and Applied Mechanics Japan, 2018, 2018.08.
22.	Masao OGINO, Takyuya IWAMA, Mitsuteru ASAI, Development of a partitioned coupling analyssis system for fluid-structure interactions using an in-house ISPH code and the ADVENTURE system, International Journal of Computational Methods, 2018, 2018.03.
23.	Li Yi, Mitsuteru ASAI, Fluid-rigid body interaction simulation based on a stabilized ISPH method incorporated with the impulse-based rigid body dynamics, 日本計算工学論文集, https://doi.org/10.11421/jsces.2018.20182010, 2018, 2, p.20182010, 2018.02.
24.	Abdelraheem M. Aly, Mitsuteru Asai, Water Entry of Decelerationg Spheres Simulaitons using Improved ISPH method, Journal of Hydrodynamivs, 2017.03.
25.	Abdelraheem M. Aly, Mitsuteru Asai, ISPH method for double-diffusive natural convection under cross difussion effects in an anisotropic porous cavity/annulus, International Journal of Numerical Methods for Heat & Fluid Flow, 26, 1, 235-268, 2016.10.
26.	Masaharu Isshiki, Mitsuteru Asai, Shimon Eguchi, Hideyuki O-tani, 3D tsunami run-up simulation and visualization using particle method with GIS-based geography model, Journal of Earthquake & Tsunami, 2016.06.
27.	Mitsuteru Asai, Yoshiya Miyagawa, Nur'Ain Idris, Abdul Muhari, Fumihiko Imamura, Coupled tsunami simulation based on a 2D shallow-water equation-based finite difference method and 3D incompressible smoothed particle hydrodynamics, Journal of Earthquake & Tsunami, 2016.06.
28.	Tomotaka Nogami, Mitsuteru Asai, Kiyonobu Kasama, Taro Arikawa, A Coupling Simulation Between Soil Scour and Seepage Flow by Using a Stabilized ISPH Method, 3RD INTERNATIONAL CONFERENCE ON CIVIL AND ENVIRONMENTAL ENGINEERING FOR SUSTAINABILITY (ICONCEES 2015), 10.1051/matecconf/20164703019, 47, 2016.01, In 2011, the example that breakwaters collapsed because of the basic ground's destabilization was reported by Tohoku-Kanto earthquake tsunami. Fluid-Structure-Soil coupling simulation is desired for a systematic comprehension of the breakwater collapse mechanism, and it may help to develop next disaster prevention method. In this study, A particle simulation tool based on the SPH has been modified and improved to analyze seepage flow and soil scouring. In seepage flow analysis, as a first step, this simulation treat the surface flow and seepage flow interactions by using governing equation. In the scouring analysis, soil scour is judged by an empirical criteria based on quicksand quantity formula..
29.	Abdelraheem M. Aly, Mitsuteru Asai, A. Chamkha, Analysis of Unsteady Mixed Convection in Lid-Driven Cavity Included Circular Cylinders Motion Using an Incompressible Smoothed Particle Hydrodynamics Method, International Journal of Numerical Mechods for Heat and Fluid Flow, 25, 2014.12.
30.	Abdelraheem M. Aly, Mitsuteru Asai, YOSHIMI SONODA, Modelling of surface tension force for free surface flows in ISPH method, International Journal of Numerical Methods for Heat and Fluid Flow, 23, 3, 479-498, 2013.04.
31.	Mitsuteru ASAI, Abdelraheem M. ALY, Yoshimi SONODA, Yuzuru SAKAI , A stabilized incompressible SPH method by relaxing the density invariant condition, Journal of Applied Mathematics, Volume 2012 (2012), Article ID 139583, 24 pages, 2012.04.
32.	Abdelraheem M. Aly, Mitsuteru Asai, Yoshimi Sonoda, Simulation of free falling rigid body into water by a stabilized incompressible SPH method, Ocean Systems Engineering, Vol. 1, No. 3, 2011.08.
33.	Mitsuteru Asai，Norliyati M. Amin, Yoshimi Sonoda, Practical determination of an effective reduced order in a model order reduction of dynamic FEM via Krylov subspace, 応用力学論文集, Vol.14, 2011.08.
34.	Mitsuteru Asai, Abdelraheem M. Aly, Yoshimi Sonoda, ISPH-FEM coupling simulator for the FSI problems, Proceeding of the 6th SPHERIC SPH workshop, pp.201-208, 2011.06.
35.	Norliyati Mohd Amin, Mitsuteru Asai, Yoshimi Sonoda, Application of a model order reduction based on the Kryrov subspace to finite element transient analysis imposing several kinds of boundary condition, IOP conf. ser. : Material Science and Engineering,, 10, 012118, 2010.05.
36.	Mitsuteru Asai, Naoki Takano, Yasutomo Uetsuji, Kunihiko Taki, An iterative solver applied to strongly coupled piezoelectric problems of porous Pb(Zr.Ti)O3 with nondestructive modeling of microstructure, Modeling and Simulation in Metarial Science and Engineering, Vol. 15, pp. 597-617, 2007.07.
37.	Kenjiro Terada, Mitsuteru Asai, Michihiro Yamagishi, Finite cover method for linear and nonlinear analysis of heterogeneous solids, International Journal of Numerical Methods in Engineering, Vol.58, pp.1321-1346, 2003.11.
38.	Mitsuteru Asai, Kenjiro Terada, Kiyohiro Ikeda, Hiroyuki Suyama, Katashi Fujii, Meso-scopic numerical analysis of concrete structures by a modified lattice model, 土木学会論文集I, Vol.20, No.1, pp.43-54, 2003.04.

1.	Mitsuteru Asai, Shujiro Fujioka, Kumpei Tsuji, Daniel Morikawa, New 2nd order particle simulation model ISPH(2) and its application to complex disaster simulation, ACM 2023, Advanced in Computational Mechanics, 2023.10.
2.	Yifang Qin, Mitsuteru Asai, Shunhua Chen, Crack propagation simulation using cohesive zone approach based on nodal Lagrange multiplier, ACM 2023, Advanced in Computational Mechanics, 2023.10.
3.	Hiroyuki Omura, Naoto Mitsume, Mitsuteru Asai, Daigoro Isobe, Tsunami-building interaction simulations using coupled ISPH/ASI-Gauss method, ACM 2023, Advanced in Computational Mechanics, 2023.10.
4.	Shota Deguchi, Mitsuteru Asai , Adaptive loss weighting of physics informed neural network for fast and accurate inverse analysis, ACM 2023, Advanced in Computational Mechanics , 2023.10.
5.	Daniel Morikawa, Mitsuteru Asai, Finite strain elastoplastic and solid-solid contact problems with the Smoothed Particle Hydrodynamics, PARTICLES 2023, 2023.10.
6.	Kumpei Tsuji, Mitsuteru Asai, Kiyonobu Kasama, Particle-based Semi-resolved Coupling Model for the Simulation of Internal Erosion in soil structures, PARTICLES 2023, 2023.10.
7.	Yangfan Ma, Mitsuteru Asai, Zheng Han, Guangqi Chen, Physical Process-Based Entrainment Behaviour Modelling of Diluted Debris Flow Using SPH Incorporated with HBP-DP Approach, PARTICLES 2023, 2023.10.
8.	Haruki Osaki, Daniel Morikawa, Mitsuteru Asai, ISPH with a Geometric Multigrid Preconditioning Solver using Background cells in GPU environment, PARTICLES 2023, 2023.10.
9.	Yusuke Saeki, Shujiro Fujioka, Kumpei Tsuji, Mitsuteru Asai, Improvement of ISPH-DEM Coupling Simulator Using SPH(2), PARTICLES 2023, 2023.10.
10.	Haruki Osaki, Daniel Morikawa, Mitsuteru Asai, Boosting a large-scale SPH particle methods using many GPUs, including inter-node communications, ICCCI2022, The 7th International Conference on the Characterization and Control of Interface for high Quality Advanced Materials, 2022.11.
11.	Yusuke Saeki, Kumpei Tsuji, Mitsuteru Asai, Modified gradient and Laplacian models in the SPH method to improve accuracy including negative pressure regions, ICCCI2022, The 7th International Conference on the Characterization and Control of Interface for high Quality Advanced Materials, 2022.11.
12.	Shujiro Fujioka, Kumpei Tsuji, Mitsuteru Asai, High-order SPH method with spatial second-order accuracy for derivative operator, ICCCI2022, The 7th International Conference on the Characterization and Control of Interface for high Quality Advanced Materials, 2022.11.
13.	Mitsuteru Asai, Kumpei Tsuji, ISPH-DEM coupling simulation for estimating internal erosion in soil, ICCCI2022, The 7th International Conference on the Characterization and Control of Interface for high Quality Advanced Materials, 2022.11.
14.	Daniel Morikawa, Mitsuteru Asai, Haruki Osaki, A phase-change approach to landslide simulations: coupling finite strain elastoplastic TLSPH with non-Newtonian IISPH, ICCCI2022, The 7th International Conference on the Characterization and Control of Interface for high Quality Advanced Materials, 2022.11.
15.	Mitsuteru Asai, Multi -scale and -physics particle simulations for natural hazard, The 41st JSST Annual International Conference on Simulation Technology, 2022.09.
16.	Kumpei Tsuji, Yusuke Saeki, Shujiro Fujioka, Mitsuteru Asai, A Hybrid ISPH-DEM Coupling Simulation for Estimating Internal Erosion in Soil, MFEM2022, 2022.09.
17.	Yusuke Saeki, Shujiro Fujioka, Kumpei Tsuji, Mitsuteru Asai, A class of Laplacian and mixed derivative models in the SPH framework, MFEM2022, 2022.09.
18.	Mitsuteru Asai, Shujiro Fujioka, A class of Laplacian and mixed derivative models in the SPH framework, WCCM-APCOM2022, 2022.08.
19.	Kumpei Tsuji, Yusuke Saeki, Mitsuteru Asai, A Hybrid seepage failure analysis between two-phase mixture flow techniques using an ISPH-DEM coupling method, WCCM-APCOM2022, 2022.08.
20.	Shota Deguchi, Yousuke Shibata, Mitsuteru Asai, Unknown parameter identification from noisy training data using physics-informed neural networks, WCCM-APCOM2022, 2022.08.
21.	Kumpei Tsuji, Mitsuteru Asai, Hemanta Hazarika, ISPH-DEM Coupled Simulation for Designing Resilient Breakwater with Gabion Reinforcements, PARTICLES 2021, 2021.10.
22.	Daniel S. Morikawa, Mitsuteru Asai, Incompressible smoothed particle hydrodynamics (ISPH) for Geomechanics problems, PARTICLES 2021, 2021.10.
23.	Kumpei Tsuji, Mitsuteru Asai, Kiyonobu Kasama, SPH-DEM simulation for estimating seepage failure of breakwaters, ICADD15, 2021.09.
24.	Mitsuteru Asai, Daniel S. Morikawa, Kumpei Tsuji, Fluid-Soil-Structure interaction simulation for natural disaster damage estimation using a particle method, ICADD15, 2021.09.
25.	Daniel S. Morikawa, Mitsuteru Asai, Smoothed particle hydrodynamics method for landslide problems based on Biot’s formulation and elastoplastic constitutive models, COUPELED PROBLEMS 2021, 2021.06.
26.	Kumpei Tsuji, Mitsuteru Asai, Kiyonobu Kasama, Simulation of Breakwater Failure induced by Tsunami Using an ISPH-DEM Coupled Method, COUPELED PROBLEMS 2021, 2021.06.
27.	Mitsuteru Asai, Daniel S. Morikawa, Non-Newtonian fluid simulation using a particle method for landslide simulations, 14th World Congress in Computational Mechanics and ECCOMAS, 2021.01.
28.	Mitsuteru Asai, Yi Li, Simulations of free-surface flow interacting with multiple rigid bodies using coupled ISPH-DEM incorporated with an energy-tracking impulse method, 14th World Congress in Computational Mechanics and ECCOMAS, 2021.01.
29.	Shota Deguchi, Mitsuteru Asai, Hiroto Ueki, Yuki Takeuchi, Koji Kawasaki, Probabilistic disaster risk evaluation with surrogate-modelled numerical simulations, COMPSAFE 2020, 2020.12.
30.	Hidetaka Ishii, Mitsuteru Asai, Daigoro Isobe, Hideyuki O-tani, Seismic response analysis for the whole city with the ASI-Gauss code to estimate a city level damage, COMPSAFE 2020, 2020.12.
31.	Kumpei Tsuji, Mitsuteru Asai, Comparison of Spherical and Non-Spherical DEM in Reproducing Arch-Effect Characteristic of Ground Collapse Phenomenon, COMPSAFE 2020, 2020.12.
32.	Takehiro Fujii, Mitsuteru Asai, Yusuke Imoto, Fluid-solid multiphase analysis using a selective dual velocity ISPH method dividing into physical and transport velocity, COMPSAFE 2020, 2020.12.
33.	Kunpei Tsuji, Mitsuteru Asai, Fluid-Solid Multiphase Disaster Simulator using SPH-DEM coupled Method, 7th Asian Pacific Congress on Computational Mechanics, 2019.12.
34.	Hiroto Ueki, Mitsuteru Asai, Koji Kawasaki, Shigetoshi Kawasaki, Drainage simulation using highly detailed unstructured grid for urban flood damage prediction, 7th Asian Pacific Congress on Computational Mechanics, 2019.12.
35.	Kohei Hara, Mitsuteru Asai, Daigoro Isobe, Seizo Tanaka, Wooden houses collapse simulation during earthquake and tsunami at a city level base on the ASI-Gauss finite element method, 7th Asian Pacific Congress on Computational Mechanics, 2019.12.
36.	Takehiro Fujii, Mitsuteru Asai, A validation for soil scouring analysis based on a SPH-DEM coupled method, 7th Asian Pacific Congress on Computational Mechanics, 2019.12.
37.	Taiga Makino, Mituteru Asai, Multi scale tsunami simulation from earthquake initiation tsunami run-up into the coastal area, 7th Asian Pacific Congress on Computational Mechanics, 2019.12.
38.	Mitsuteru Asai, Mikito Furuichi, Daisuke Nishiura, Dynamic Load Balanced Expanding Slice Grid Method for Large-scaled High Fidelity Tsunami Run-up Simulation suing an Explicit SPH, VI International Conference on Particle-based Method - Fundamentals and Applications PARTICLES 2019, 2019.10.
39.	Li Yi, Mitsuteru Asai, Bodhinanda Chandra, Simulation of Free-surface Flow Interacting with Multiple Rigid Bodies using Coupled ISPH－DEM incorporated with Energy Tracking Impulse Contact, VI International Conference on Particle-based Method - Fundamentals and Applications PARTICLES 2019, 2019.10.
40.	Kunpei Tsuji, Mitsuteru Asai, Fluid-Solid multi-phase flow simulator using a SPH-DEM coupling method in consideration of liquid bridge force related to water content, VI International Conference on Particle-based Method - Fundamentals and Applications PARTICLES 2019, 2019.10.
41.	Daniel Morikawa, Mitsuteru Asai, Masaharu Isshiki, Verification and Validation in Highly Viscous Fluid Simulation using a Fully Implicit SPH Method, VI International Conference on Particle-based Method - Fundamentals and Applications PARTICLES 2019, 2019.10.
42.	Kohei Hara, Mitsuteru Asai, Daigoro Isobe, Seizo Tanaka, Collapse Simulation of Aso Bridge During The 2016 Kumamoto Earthquakes By Asi-Gauss Code, 7th International Colloquium on Performace, Protections & Strengthening of Structure Under Extreme Loading & Events, 2019.10.
43.	Mitsuteru Asai, Li Yi, Fluid-rigid body interaction simulation based on a stabilized ISPH incorporated with an Energy Tracking Impulse method, 20th Internatinal Conference on Fluild Flow Problem, 2019.04.
44.	Daniel Shigueo Morikawa, Mitsuteru Asai, Improvements on Highly Viscous Fluid Simulation Using the SPH Method, 7th International Conference on Protection of Structures against Hazards, 2018.10.
45.	Kohei Hara, Mitsuteru Asai, Daigoro Isobe, Verification on collapse process of Aso bridge during the 2016 Kumamoto earthquakes by ASI-Gauss method, 7th International Conference on Protection of Structures against Hazards, 2018.10.
46.	Kumpei Tsuji, Mitsuteru Asai, Yasuhiko Konishi, Shuichi Oomine, 3-Dimensinal SPH-DEM coupled simulation for elucidating road caving collapse processes involving water-soil coupling phenomenon, 7th International Conference on Protection of Structures against Hazards, 2018.10.
47.	Naoki Nakaya, Mitsuteru Asai, Ryoichiro Agata, Takane Hori, Toshitaka Baba, Tsunami Run-up Simulation Based on Crustal Deformation Simulation by FEM, 7th International Conference on Protection of Structures against Hazards, 2018.10.
48.	Mitsuteru Asai, Naoki Nakaya, Ryoichiro Agata, Takane Hori, Toshitaka Baba, A physical simulation based earthquake scenario and a multi-scale Tsunami simulation, 13th World Congress on Computational Mechanics, 2018.07.
49.	Li Yi, Mitsuteru Asai, Fluid-rigid body interaction simulation based on ISPH incorporated with impulse-based method, 13th World Congress on Computational Mechanics, 2018.07.
50.	Daniel Shigueo Morikawa, Mitsuteru Asai, Improvements on Highly Viscous Fluid Simulation using a Particle Method and Its Application to Landslide Problems, 13th World Congress on Computational Mechanics, 2018.07.
51.	Mitsuteru Asai, Natural disaster simulation by as multiphysics particle simulation, 4th Computational Desing in Engineering, 2018.04, 独自に開発を進めている粒子法によるマルチフィジックス解析ツールによる災害被害予測シミュレーションに関する招待講演（セミプレナリー）を実施した。.
52.	Daniel Shigueo Morikawa, Mitsuteru Asai, Improvements on Highly Viscous Fluid Simulation using a Particle Method, 4th Computational Desing in Engineering, 2018.04.
53.	Li Yi, Mitsuteru ASAI, A bridge wash-out simulation using a stabilized ISPH incorporated with multi-body dynamivs based on the impulse-based contact force method, Compsafe 2017, 2017.10.
54.	Masao Ogino, Mitsuteru ASAI, Takuya Iwama, A study on parallel fluid-structure interaction simulations using a SPH code and the adventure through REVOCAP_coupler, Compsafe 2017, 2017.10.
55.	Masao Ogino, Mitsuteru Asai, Takuya Iwama, A study on parallel fluid-structure interaction simulations using a SPH code and the adventure through REVOCAP coupler, Compsafe 2017, 2017.10.
56.	Yi Li, Mitsuteru Asai, A bridge wash-out simulation using a stabilized ISPH incorporated with multi-body dynamivs based on the impulse-based contact force method, Compsafe 2017, 2017.10.
57.	Mitsuteru Asai, Multi-scale and –physics tsunami disaster simulation for disaster prevention and mitigation, Compsafe 2017, 2017.10.
58.	Kensuke Harasaki, Mitsuteru ASAI, Development of a fluid-solid multiphase flow simulation by a SPH-DEM coupled method for simulating a seawall destruction due to soil foundation scour, Particle 2017, 2017.09.
59.	Mitsuteru ASAI, Multi-scale and –physics tsunami disaster simulation for disaster prevention and mitigation, Particle 2017, 2017.09.
60.	Keita Ogasawara, Mitsuteru Asai, Mikito Furuichi, Daisuke Nishiura, Peformance of large scaled tsunami run-up analysis using Explicit ISPH method, Particle 2017, 2017.09.
61.	浅井光輝, Multi-scale and –physics tsunami disaster simulation for disaster prevention and mitigation, Compsafe 2017, 2017.02.
62.	Mitsuteru Asai, Masaharu Isshiki, Syoichi Tanabe, Large scale tsunami simulation by the incompressible SPH with real geography generated from aero-survery data, International Conference on Particle-Based Method (Particle2013), 2013.09.
63.	浅井光輝, Large scale tsunami simulation by a particle method and its application to disaster prediction, 12th U.S. Natinal Congress on Computational Mechanics (USNCCM12), 2013.07.