© 2016 Acta Acustica.Computational fluid dynamics (CFD) associated with acoustic analogy theory was employed to numerically study the aerodynamic sound induced by the flow past a cylinder in the subcritical regime. The goal is to testify the reliability and accuracy of Curie's dipole and LighthilFs quadrupole source models according to the acoustic analogy theory. The 3-D unsteady turbulent flow fields were calculated by Large Eddy Simulation (LES) method. The equivalent sources were extracted from the time history flow data with Fourier Transform applied to extract the components at the vortex shedding frequency. The sound radiation by Curie's theory was obtained by a numerical surface integral, and a good agreement with the sound measurement was found. The sound radiation of LighthilFs quadrupoles was obtained by solving the inhomogeneous Helmholtz equation, and erroneous results might arrived at if the volumetric sources were truncated inappropriately. The study indicates that Curie's model is superior to LighthilFs model based on its more reliable results and low computational cost.
|Journal||Shengxue Xuebao/Acta Acustica|
|Publication status||Published - 2016|