GPUによるラージエディ・シミュレーションの高速化(乱流の予測とモデリング(1),一般講演)

概要

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The scale of the turbulent vortex spreads proportional to Re^<3/4>, since a lot of computational costs are required to calculate the direct numerical simulation (DNS). Large-eddy simulation (LES) is a successful approach to simulate turbulent phenomena. The dynamics of the large-scale structures are computed on the grid, while the effect of the small-scale turbulence is modeled by using a subgrid-scale (SGS) model. The coherent-structure model (CSM), proposed by H. Kobayashi, is one of successful SGS models, The eddy-viscosity is locally determined by the flow field, and any averagings in homogeneous directions are not required. In this research, turbulent phenomena are calculated by using a graphics processing unit (GPU). Our code accelerates LES and achieves 100Gflops for 256^3 grid. Numerical results are in good agreement with the DNS.
2010-09-09