1553 差分格子ボルツマン法の 3 次元圧縮性モデルによる流体音の直接計算

概要

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Three-dimensional direct numerical simulation of aerodynamic sound by the finite difference lattice Boltzmann method (FDLBM) is reported. We use a new lattice BGK compressible fluid model that has an additional term and allow larger time increment comparing the conventional FDLBM, and also use a boundary fitted co-ordinates. We have succeeded in capturing very small pressure fluctuations in a uniform flow over a circular cylinder. They were generated with same frequency of Karman vortex street. We can also succeed to detect the aerodynamic sound which is generated by a three-dimensional body and propagates in radial direction. We clarified that we can calculate the aerodynamic sound directly using by the finite difference lattice Boltzmann method.
社団法人日本機械学会の論文
2003-08-05