Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Mitsuteru Asai Last modified date:2020.03.10

Associate Professor / Structural and Earthquake Engineering / Faculty of Engineering


Papers
1. 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。.
2. 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。.
3. 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.
4. 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.
5. 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.
6. Abdelraheem M. Aly, Mitsuteru Asai, Water Entry of Decelerationg Spheres Simulaitons using Improved ISPH method, Journal of Hydrodynamivs, 2017.03.
7. 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.
8. 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.
9. 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.
10. Abdelraheem M. Aly, Mitsuteru Asai, Three-dimensional incompressible Smoothed Particle Hydrodynamics for simulating fluid flow through porous structures, Transfort in Pourous Media, 2015.09.
11. 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.
12. Abdelraheem M. Aly, Mitsuteru Asai, Ali J. 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 Methods for Heat and Fluid Flow, 10.1108/HFF-10-2014-0305, 25, 8, 2000-2021, 2015.11, Purpose - The purpose of this paper is to model mixed convection in a square cavity included circular cylinders motion using an incompressible smoothed particle hydrodynamics (ISPH) technique. Design/methodology/approach - The problem is solved numerically by using the ISPH method. Findings - The SPH tool shows robust performance to simulate the rigid body motion in the mixed convective flow with heat transfer, and it may apply easily to complicated problems in 2D and 3D problem without difficulties. Originality/value - The application of the SPH method to mixed convective flow with heat transfer and its potential application easily to complicated 3D problems is original..
13. Abdelraheem M. Aly, Mitsuteru Asai, Incompressible smoothed particle hydrodynamics simulations of fluid-structure interaction on free surface flows, International Journal of Fluid Mechanics Research, 10.1615/InterJFluidMechRes.v41.i6.10, 41, 6, 471-484, 2014.01, In this paper, fluid-structure interaction (FSI) on free surface flows has been simulated using ISPH method. The governing equations are discretized and solved with respect to Lagrangian moving particles filled within the mesh-free computational domain and the pressure was evaluated by solving pressure Poisson equation using a semi-implicit algorithm based on the projection scheme to ensure divergence free velocity field and density invariance conditions. In this study, the structure is taken as a rigid body and it modeled using ISPH method by two different techniques. In the first technique, the solid particles are treated initially as fluid particles and after corrector step in projection method, the solid constraint is applied to get the rigid body motion. In the second technique, we computed the motions of a rigid body by direct integration of fluid pressure at the position of each particle on the body surface. Then, the equations of translational and rotational motions were integrated in time to update the position of the rigid body at each time step. The applicability and efficiency of current ISPH method with the two different treatment of rigid body are tested by comparison with reference experimental results..
14. Abdelraheem M. Aly, Mitsuteru Asai, Three-Dimensional Incompressible Smoothed Particle Hydrodynamics for Simulating Fluid Flows Through Porous Structures, Transport in Porous Media, 10.1007/s11242-015-0568-8, 110, 3, 483-502, 2015.09, In this paper, a stabilized incompressible smoothed particle hydrodynamics (ISPH) method is presented in three dimensions for simulating fluid flows through porous structures. In the ISPH algorithm, a semi-implicit velocity correction procedure is utilized and the pressure is implicitly evaluated by solving pressure Poisson equation. Evaluated pressure has been improved by relaxing the density invariance condition to formulate a modified pressure Poisson equation. The effect of eddy viscosity by using a sub-particle scale turbulence model is introduced to the entire computational domain. The key point for the application to the non-Darcy flows is to include porosity and drag forces of the medium into ISPH method. Modified density of particles according to their porosity is introduced to satisfy continuity criteria in ISPH method. Tracking free surface with Dirichlet boundary condition is modified for the free surface flows in the porous structure. In this study, different numerical tests for fluid flows through porous structures have been simulated. Also, the results from this investigation are well validated and have favorable comparisons with the experimental results..
15. Abdelraheem M. Aly, Mitsuteru Asai, Modelling of non-Darcy flows through porous media using extended incompressible smoothed particle hydrodynamics, Numerical Heat Transfer, Part B: Fundamentals, 10.1080/10407790.2014.955772, 67, 3, 255-279, 2015.03, In this article, a novel numerical method is presented for the simulation of non-Darcy flows through porous media by the incompressible smooth particle hydrodynamics (ISPH) method with a predictor-corrector scheme. In the ISPH algorithm, a semi-implicit velocity-correction procedure is used and the pressure is obtained by solving the pressure Poisson equation. The key point for the application to non-Darcy flows is to include porosity and drag forces of the medium (the Darcy term and the Forcheimer term) in the ISPH method. Unsteady lid-driven flow, natural convection in non-Darcy porous cavities, and natural convection at a porous medium-fluid interface are examined separately by our extended ISPH method. The results are presented with flow configurations, isotherms, and average Nusselt numbers for different Darcy numbers from 10-4 to 10-2, porosity values from 0.4 to 0.9, and Reynolds/Rayleigh numbers. The flow pattern and rate of heat transfer inside the cavity are affected by these parameters. The results demonstrate the important effect of the Darcy number on both the heat transfer rate and the flow regime. The results from this investigation are well validated and compare favorably with previously published results..
16. 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.
17. Abdelraheem M. Aly, Mitsuteru Asai, Yoshimi Sonda, Modelling of surface tension force for free surface flows in ISPH method, International Journal of Numerical Methods for Heat and Fluid Flow, 10.1108/09615531311301263, 23, 3, 479-498, 2013.12, Purpose - The purpose of this paper is to show how a surface tension model and an eddy viscosity based on the Smagorinsky sub-grid scale model, which belongs to the Large-Eddy Simulation (LES) theory for turbulent flow, have been introduced into ISPH (Incompressible smoothed particle hydrodynamics) method. In addition, a small modification in the source term of pressure Poisson equation has been introduced as a stabilizer for robust simulations. This stabilization generates a smoothed pressure distribution and keeps the total volume of fluid, and it is analogous to the recent modification in MPS. Design/methodology/ approach - The surface tension force in free surface flow is evaluated without a direct modeling of surrounding air for decreasing computational costs. The proposed model was validated by calculating the surface tension force in the free surface interface for a cubic-droplet under null-gravity and the milk crown problem with different resolution models. Finally, effects of the eddy viscosity have been discussed with a fluid-fluid interaction simulation. Findings - From the numerical tests, the surface tension model can handle free surface tension problems including high curvature without special treatments. The eddy viscosity has clear effects in adjusting the splashes and reduces the deformation of free surface in the interaction. Finally, the proposed stabilization appeared in the source term of pressure Poisson equation has an important role in the simulation to keep the total volume of fluid. Originality/value - An incompressible smoothed particle hydrodynamics is developed to simulate milk crown problem using a surface tension model and the eddy viscosity..
18. Mitsuteru Asai, Keisuke Fujimoto, Abdelraheem M. Aly, Yoshimi Sonoda, Fluid-Soil-Structure coupling analysis for tsunami disaster simulation, Proceeding of KSME-JSME joint symposium on computational mechanics & CAE 2012, 11-16, 2012.09.
19. Mitsuteru Asai, Multi-scale modeling in heterogeneous material properties, MI Lecture Note Series, 39, 84-95, 2012.09.
20. Naoki Takano, Mitsuteru Asai, Kohta Okamoto, Monte Carlo simulation of dynamic problem using model order reduction technique highlighting on tail probability, Journal of Solid Mechanics and Materials Engineering, 6, 3, 169-181, 2012.09.
21. 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.
22. Mitsuteru Asai, Hiroki Iida, Norliyati M. Amin and Yoshimi Sonoda , Fast dynamic solver for the design of bridge using a model order reduction
, Proceeding of 9th International Conference on Shock & Impact Loads on Structures, 225-234, 2011.11.
23. Nobutaka ISHIKAWA, Masuhiro BEPPU, Tsutomu MIKAMI, Hiroshi TATESAWA, Mitsuteru ASAI , Collapse mechanism of seawalls by impulsive load due to the March 11 tsunami
, Proceeding of 9th International Conference on Shock & Impact Loads on Structures, 1-12, 2011.11.
24. Abdelraheem M. ALY, Mitsuteru ASAI, Yoshimi SONODA , A study of violent water induced impact problems using ISPH method
, Proceeding of 9th International Conference on Shock & Impact Loads on Structures, 217-224, 2011.11.
25. Mitsuteru ASAI, Akane WATANABE, Yoshimi SONODA, Development of a 3D coupling simulator between chemical diffusion and nonlinear mechanics in meso-scopic concrete, Proceedings of the 2011 World Congress on Advances in Structural Engineering and Mechanics, 3515-3523, 2011.09.
26. Abdelraheem M. ALY, Mitsuteru ASAI and Yoshimi SONODA, Floating rigid body simulation in free surface flow using a stabilized incompressible SPH method, Proceedings of the 2011 World Congress on Advances in Structural Engineering and Mechanics, 4460-4469, 2011.09.
27. 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.
28. 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.
29. 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.
30. Norliyati Mohd Amin, Mitsuteru Asai, Yoshimi Sonoda, Fast transient structural FE analysis imposing prescribed displacement condition by using a model order reduction method via Kryrov subspace, 応用力学論文集, 13, 159-167, 2010.08.
31. 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.
32. Mitsuteru Asai, Takanori Hayashi, Yoshimi Sonoda, Numerical estimation of water-induced impact pressure by using a smoothed particle hydrodynamics for incompressible flow, Proceedings of Protect2009, 2009.08.
33. Mitsuteru ASAI, Kenjiro TERADA and Atsushi MARUYAMA, Eulerian Finite Cover Method for multi-scale analysis of large deformed composites, 8 th World Congress on Computational Mechanics, 2008.07.
34. 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.
35. S. Manchiraju, Mitsuteru Asai, S. Ghosh, A dual-time-scale finite element model for simulating cyclic deformation of polycrystalline alloys, Journal of Strain Analysis for Engineering Design, 10.1243/03093247JSA233, 42, 4, 183-200, 2007.08, A dual-time-scale finite element model is developed in this paper for simulating cyclic deformation in polycrystalline alloys. The material is characterized by crystal plasticity constitutive relations. The finite element formulation of the initial boundary-value problems with cyclic loading involves decoupling the governing equations into two sets of problems corresponding to two different time-scales. One is a long-time-scale (low-frequency) problem characterizing a cycle-averaged solution, while the other is a short-time-scale (high-frequency) problem for a remaining oscillatory portion. Cyclic averaging together with asymptotic expansion of the variables in the time domain forms the basis of the multitime-scaling. The crystal plasticity equations at the two scales are used to study cyclic deformation of a titanium alloy Ti-6Al. This model is intended to study the fatigue response of a material by simulating a large number of cycles to initiation..
36. Kenjiro Terada, Mitsuteru Asai, Finite cover method for physically and geometorically nonlinear problems, Lecture Notes on Computaional Science and Engineering, Vol.43, pp.169-190, 2005.01.
37. Mitsuteru Asai, Somnath Ghosh, Temporal homogenization for crystal plasticity, AIP Conference Proceedings, Vol. 712, pp.1725-1730, 2004.06.
38. 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.
39. 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.
40. Mitsuteru Asai, Kenjiro Terada, Kiyohiro Ikeda, Meso-scopic concrete analysis with a lattice model, Proceeding of FRAMCOS-4, A.A. Publishers, pp.757-764, 2001.05.