206 有限体積格子ボルツマン法による空力音の直接計算(S37-1 CFDの新展開(1),S37 CFDの新展開)  [in Japanese] 206 Direct Simulation of Acoustic Waves by Finite Volume Lattice Boltzmann Method  [in Japanese]

The acoustic waves emitted from various objects have been simulated by the Finite Difference Lattice Boltzmann Method (FDLBM) using a two-dimensional thermal compressible lattice BGK model. We have obtained same accurate results of the acoustic waves by this method. FDLBM, however, requires structured grids, so we have only used this grid style in same cases. But, for the complex flow field, unstructured grids should be used. In this paper, the acoustic waves emitted from a circular cylinder simulated by the Finite Volume Lattice Boltzmann Method (FVLBM) using a two-dimensional thermal compressible lattice BGK model, in unstructured grids. We clarified that the acoustic waves can be calculated directly by this FVLBM model in unstructured grids.