AM06-01-003 差分格子ボルツマン法による遷音速流中の物体から生じる空力音の直接計算(騒音(1)〜はく離流れと空力騒音〜,一般講演)

概要

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According to recent studies, the finite difference lattice Boltzmann method (FDLBM) is proved to be effective to direct simulation of aero-acoustic waves emitted from bodies. We have directly simulated the Aeolian tone and the edge tone, and good results have been obtained. However it is known that we can not simulate transonic flows around bodies by the FDLBM due to numerical instability. This reason seems to be that the equilibrium distribution function becomes negative value if the flow velocity is almost sound speed. In this report, we have simulated transonic flows around bodies by applying moving grid system and keeping flow speed small. We have shown numerical results agree well with shadowgraphs, and satisfy the Rankine-Hugoniot's relations. We have also simulated acoustic waves generated by the interaction between shock waves and Karman vortexes.
2006-09-05