基于大涡模拟和FW-H方程的二维圆柱风噪声模拟

针对不同直径二维圆柱的风噪声，采用大涡模拟和FW-H方程声类比的方法进行计算，将基准模型的计算结果与他人计算和实验结果进行对比，分析不同直径二维圆柱的远场声场特征.研究表明：基准模型的数值模拟结果与实验值非常接近，说明了本文计算方法的适用性；远场采样点的声压级频谱峰值频率随着圆柱直径的增大而减小，同根据斯特罗哈数为0.2的理论值计算的峰值涡脱频率接近；10~38 mm直径工况远场采样点的总声压级随着直径的增大基本上呈线性增加趋势；总声压级和A计权总声压级随雷诺数的增加，呈现在亚临界区内增加、而在接近临界区时减小的变化趋势.
A numerical simulation using large eddy simulation and FW-H equation acoustic analogy was performed to analyze the acoustic field of 2-D circular cylinders with different diameters.The calculating results of the standard model were compared with the experimental results and the numerical results of other researchers.The far-field aeolian noise characteristics of 2-D circular cylinders with different diameters were analyzed.The Results show that the simulation results of the standard model are very close to the experiment results，indicating the rationality of the simulation.The peak frequency of sound pressure level of the far-field receiver decreases with the increase of the diameters of 2-D circular cylinders，and is close to the peak frequency calculated from the Strouhal number 0.2，which is considered to be the theoretical value.The overall sound pressure level of the far-field receiver under conditions of 2-D circular cylinders with diameters of 10~38 mm increases almost linearly with the diameter.With the increase of Reynolds number，the overall sound pressure level and a-weighted overall sound pressure level have an upward trend in the sub-critical range and a downward trend near the super-critical range.