矩形周辺流れから発生する空力音および物体表面上の音源特性に関する数値流体解析

抄録

Numerical simulations of the flows around rectangular cross-sections are carried out to examine the aerodynamic sound generated by the flows and its sources on the body surface. The flows are simulated by solving the unsteady two-dimensional incompressible Navier-Stokes equations. The aerodynamic sound is evaluated by using the Curie's solution of the Lighthill aeroacoustic analogy.It is found that the intensity of the aerodynamic sound sources are strong near the reattachment points of the separated shear flows on the body surface, and the reattachment to the body surface closer to the trailing edge generates stronger aerodynamic sound.Furthermore, it is shown that some sound sources have the effect of reducing the aerodynamic sound.