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Research

• Higher-order Numerical Scheme
• Fluid-Structure Interaction
• Algorithm and Applications using SIMD-type Accelerators
• High-accurate Computation of Multi-phase Flows
• Simulation for Natural Disasters
• Compressible Flow including high pressure ratio
• Scientific Visualization

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2011 Two-phase Flow Simulation of Oil-Air Steering with a Rotating Gear A oil-air two-phase flow is solved by mesh-based semi-implicit numerical method on a rotating frame.
2011 Large-scale GPU Simulation for Dendritic Solidification of Al-Si Alloy 3-dimensional Phase-Field Simulation for the dendritic solidification of Al-Si binary alloy. A performance of 2.0 PFLOPS has been achieved on 4,000 GPU of the TSUBAME 2.0 supercomputer (see more details)
2010 A Typhoon Simulation on Horizontal 500-m Mesh using the Next-Generation Weather Prediction Model ASUCA The next-generation 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.
2010 A Gas-Liquid Two-Phase Flow Simulation using Multi-GPU computing A 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 two-phase flow model is solved on a numerical mesh and a multi-GPU sparse matrix solver using Krylov subspace iteration method with a MG preconditioner has been developed for the pressure Poisson equation.
2009 GPU Computing for Dendritic Solidification of a Pure Metal based on Phase-Field Model A large-scale 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.
2008 GPU Computing for Rayleigh-Taylor instability Compressible CFD application can be accelerated on GPU. The Euler equation is accurately solved by conservative IDO scheme. When GeForce GTX280 is used, 40 times speed-up (54 GFlops) is achieved.
2008 Tsunami Simulation on GPU The shallow water equation is solved by the conservative IDO scheme. The tsunami run-up to dry area can be computed accurately. The GPU computing achieves 60 times speed-up for NVIDIA GeForce GTX280.
2008 Granular Behavior composed of non-spherical particle shapes. Such non-spherical 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.
2007 Rock Falling Simulation The 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.
2006 Meso-scale Atmosphere Model (Typhoon Simulation) Non-hydrostatic atmosphere model is necessary to study typhoon. In collaboration with HyRAC Nagoya University, spiral rain bands are described well.
2005 Rising Bubbly Flow The Multiphase flow is solved by the CIP method. The bubbly flow collaboration with JAEA. The photo-realistic images are visualized by the ray-tracing technique of the software POV-Ray.
2003 Explosion-Blastwave Extremely high pressure of the detonation product gas drives hydrodynamic instabilities for the blastwave evolved into turbulent state.
2002 3D 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
2001 Falling Leaves Fluid-Structure Interaction study using overset grid method and IDO scheme. The falling trajectory of the leaves strongly depend on the initial attitudes.