J091041 角柱まわりの流れから発生する音の数値計算([J09104]流体関連の騒音と振動(4))

概要

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To propose the appropriate method of hybrid simulation of aerodynamic noise from flows around a bluff body, both direct simulation and hybrid that were performed on the acoustic radiation by a rectangular cylinder in a uniform flow. The freestream Mach number M was 0.2, and the Reynolds number based on the rectangular side was Re = 150. The hybrid simulation was performed by the finite element method based on the Lighthill's acoustic sources. In the present hybrid simulation, where 10 vortices were captured in the wake, the acoustic field was accurately predicted including the Doppler effects. Moreover, to clarify the dominant acoustic sources which contribute to the far acoustic field, the acoustic simulations are performed by using the acoustics sources, the parts of which were filtered out. As a result, it was found that the acoustic sources due to the separated shear layer around the upstream edge are dominant.
一般社団法人日本機械学会の論文
2011-09-11