【摘要】 为了探究数值计算方法在气动声学计算中的准确性,基于变分原理的Lighthill声类比理论,数值模拟了三维串列双圆柱的气动噪声。为了获得噪声源,采用大涡模拟(LES)求解不可压非定常的流场。计算得到的双圆柱流场特性和声学特性与试验吻合得很好。上游圆柱的涡脱落与下游圆柱抨击引起的特征线谱噪声特性也得到很好的预测。更多还原

【Abstract】 In order to validate the accuracy of the numerical method for aeroacoustic,a numerical simulation of aeroacoustics on the tandem cylinders is conducted based on Lighthill′s acoustic analogy of the variational formulations.The acoustic sources are obtained from incompressible unsteady flow computations by using large eddy simulation(LES)model.The numerical results are consistent with the corresponding measured data.The generation mechanism of the tonal noise,which is directly related to interaction between the downstream cylinder and the vortex shedding originating from the upstream cylinder,is well detected.更多还原