Development of the lattice Boltzmann method for gas-liquid-solid multiphase flow on Multi-GPU cluster

Onodera, Naoyuki   ; Ohashi, Kunihide*

Ship maneuverability under heavy weather is one of important themes for safety. In order to understand the detail of ship motion, it is necessary to carry out large scale gas-liquid-solid multiphase simulations. We have developed a CFD code based on LBM (Lattice Boltzmann Method) with a two-phase free-surface model. LBM accesses memory with a simple algorithm and is suitable for large-scale computations. The code is written in CUDA and tuned to achieve high performance on TSUBAME 2.5. The proposed two-phase model is based on a free-surface model, and both liquid and gas phases are independently time-integrated. We demonstrate a fluid-structure interaction problem by using a bulk carrier data. The simulation is executed with 700 120 400 mesh, and numerical stabilities are confirmed with high density ratio.