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2021A Simulation of Water Strider Swimming on Water Surface using AMR methodA computer simulation of a water strider swimming on water surface is conducted by using a weakly compressible gasliquid twophase flow computational method. AMR (Adaptive Mesh Refinement) method works efficiently and the propulsion comes from the capillary force for the surface deformation driven by the middle leg. 

2020Violently Flattering FlagIt is familiar for us to see violently flattering flags with strong winds. It is a typical fluidstructure interaction problem. A wind deforms the flag and the deformation changes the wind. We compute violent flag deformations and interaction with turbulent flows by using the cumulant Lattice Boltzmann Method with AMR (Adaptive Mesh Refinement) method. Strong vortices are released continuously from the trailing edge. 

2020A Freesurface Flow including a lot of driftwoodsBy using Lattice Boltzmann Method based on the cumulant collision model, freesurface flows including a lot of driftwoods have been studied. The phase field equation describes the surfaces and the velocity extension method with levelset function extrapolates the distribution function into the air region. An octreebased AMR (Adaptive Mesh Refinement) method has assigned highresolution mesh near the free surfaces and driftwoods. A spacefilling based dynamic domain partitioning is used for largescale computations with multiple GPUs.


2019Soap Bubble GrowingThe process of a soap bubble growing is simulated by using a weakly compressible computational method. An air is blowing into a soap bubble of 20 % glycerin aqueous solution. When the diameter has grown up to 12.5cm, the liquid film has 117mm thickness. An AMR (Adaptive Mesh Refinement) method greatly improves the computational efficiency with assignment of highresolution mesh around the gasliquid interface. 

2019Breakingup of A Liquid JetA simulation of liquid jet injected into a compressed air has been carried out with a weakly compressible flow computational method. The jet is broken up and atomized in the air. A block AMR (Adaptive Mesh Refinement) method reduces the total mesh number to 1/30 uniform mesh and it takes 11 hours to complete the computation on a single NVIDIA Tesla V100 GPU.


2019Dolphin Free SwimmingA dolphin shape has been carefully scanned and a freeswimming by deforming the fail fin with a travelling wave has been studied by using a cumulantcollision LBM (Lattice Boltzmann Method) and AMR (Adaptive Mesh Refinement) technique with a octree data algorithm. A dynamic domain decomposition based on a spacefilling curve has been also implemented to use multiple GPU nodes. The computation is carried out on TSUBAME3.0.


2018Forming Liquid Film on a SpoonIt often appears that a liquid film is formed by pouring a water on a spoon. Two novel methods of a weakly compressible computation and octreebased block AMR (Adaptive Mesh Refinement) make it possible to compute the twophase flow forming a liquid film with hydrodynamic stabilization.


2011Twophase Flow Simulation of OilAir Steering with a Rotating GearA oilair twophase flow is solved by meshbased semiimplicit numerical method on a rotating frame.


2011Largescale GPU Simulation for Dendritic Solidification of AlSi Alloy3dimensional PhaseField Simulation for the dendritic solidification of AlSi binary alloy. A performance of 2.0 PFLOPS has been achieved on 4,000 GPU of the TSUBAME 2.0 supercomputer


2010A Typhoon Simulation on Horizontal 500m Mesh using the NextGeneration Weather Prediction Model ASUCAThe nextgeneration weather prediction model ASUCA being developed by Japan Meteorological Agency has been implemented on a GPU rich supercomputer TSUBAME2.0. A typhoon simulation is successfully carried out with horizontal 500m mesh covering the whole Japan area. 

2010A GasLiquid TwoPhase Flow Simulation using MultiGPU computingA leading water of the breaking dam water launching into a wet floor becomes strongly violent, which is quit different from that into a dry floor. A twophase flow model is solved on a numerical mesh and a multiGPU sparse matrix solver using Krylov subspace iteration method with a MG preconditioner has been developed for the pressure Poisson equation.


2009GPU Computing for Dendritic Solidification of a Pure Metal based on PhaseField ModelA largescale GPU simulation for a dendritic solidification of a pure metal is carried out using 60 GPUs of NVIDIA Tesla S1070 on TSUBAME1.2 and a performance of 60 TFlops has been achieved for the computation of 1024x1024x1024 mesh.


2008GPU Computing for RayleighTaylor instabilityCompressible CFD application can be accelerated on GPU. The Euler equation is accurately solved by conservative IDO scheme. When GeForce GTX280 is used, 40 times speedup (54 GFlops) is achieved.


2008Tsunami Simulation on GPUThe shallow water equation is solved by the conservative IDO scheme. The tsunami runup to dry area can be computed accurately. The GPU computing achieves 60 times speedup for NVIDIA GeForce GTX280.


2008Granular Behavior composed of nonspherical particle shapes.Such nonspherical shapes as rice are taken into consideration to study numerically the real granular phenomena, and the numerical results are in good agreement with the experiment.


2007Rock Falling SimulationThe complex shapes of rocks are modeled as assemblies of small particles rigidly connecting each others. In order to describe the rotation of rocks, quaternion is introduced. 

2006Mesoscale Atmosphere Model (Typhoon Simulation)Nonhydrostatic atmosphere model is necessary to study typhoon. In collaboration with HyRAC Nagoya University, spiral rain bands are described well.


2005Rising Bubbly FlowThe Multiphase flow is solved by the CIP method. The bubbly flow collaboration with JAEA. The photorealistic images are visualized by the raytracing technique of the software POVRay.


2003ExplosionBlastwaveExtremely high pressure of the detonation product gas drives hydrodynamic instabilities for the blastwave evolved into turbulent state. 

20023D Visualization for Particle Simulation (DEM)Granular phenomena like Meteorite Impact on the ground. The simulation is based on the Distinct Element Method and parallelized by OpenMP. To see the 3D graphics, an anaglyph glass is 

2001Falling LeavesFluidStructure Interaction study using overset grid method and IDO scheme. The falling trajectory of the leaves strongly depend on the initial attitudes.
