J1002-2-4 Lighthillテンソルを用いた空力音響解析に関する解析メッシュ及び境界条件に関する検討(流体関連の騒音と振動2)

概要

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The aim of this research is to understand aerodynamic sound generation and propagation from low-Mach number turbulent wake of a bluff body. In order to evaluate both sound pressure strength and propagation pattern, aeroacoustic fields of a square cylinder were numerically calculated with domain decomposition method. The Lighthill tensor was taken from a numerical flow simulation and acoustics filed was calculated by using Finite Element Method. Since phase differences of the sound source term in the space domain play an important role to aerodynamic noise generation, computational grid for aeroacousitcs simulations is necessary to use much higher resolution grids than that of the conventional acoustic analysis. Although the window function of the source term can be removed reflection of the numerical boundaries, insufficient window function makes non-physical ound pressure. Therefore, sufficient grid mapping and window function are necessary to simulate vortex sound.
2009-09-12