複雑形状物体から発生する空力音の並列計算
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概要
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In order to calculate aerodynamic noise radiated from a complex-shaped body such as a pantograph of Shinkansen, an algorithm of the boundary element method for solving shape-adapted Green's functions is parallelized. The dense matrix of pluralistic simultaneous linear equations is divided and reallocated artfully on local memories assigned to each CPU of a massively parallel computer, which enable to handle numerical models with a large number of boundary elements. After modification, bench mark tests demonstrate high parallel performance with hundreds of processes. Then incompressible flow around the pantograph is calculated by the large eddy simulation (LES), and its results are coupled with shape-adapted Green's functions to evaluate aerodynamic noise based on formulas of vortex sound theory. By extracting the net contribution from diffracted and scatted sound sources that are distributed downstream of shafts and covers, sound pressure in the far field proves to agree well with wind tunnel experimental data.