文献类型：期刊文献

英文题名：A three-dimensional hybrid LES-acoustic analogy method for predicting open-cavity noise

作者：Lai, Huanxin[1,2]; Luo, Kai H.[2]

机构：[1] Fluid Machinery Group, East China University of Science and Technology, Mail Box 401, 130 Meilong Rd., Shanghai 200237, China; [2] Energy Technology Research Group, School of Engineering Sciences, University of Southhampton, Southhampton SO17 1BJ, United Kingdom

年份：2007

卷号：79

期号：1

起止页码：55

外文期刊名：Flow, Turbulence and Combustion

收录：EI(收录号：20072410649008)

语种：英文

外文关键词：Computational methods - Large eddy simulation - Mach number - Reynolds number - Three dimensional - Wave propagation

摘要：A three-dimensional (3D) hybrid LES-acoustic analogy method for computational aeroacoustics (CAA) is presented for the prediction of open-cavity noise. The method uses large-eddy simulation (LES) to compute the acoustic source while the Ffowcs Williams-Hawkings (FW-H) acoustic analogy is employed for the prediction of the far-field sound. As a comparison, a two-dimensional (2D) FW-H analogy is also included. The hybrid method has been assessed in an open-cavity flow at a Mach number of 0.85 and a Reynolds number of Re=1.36×106, where some experimental data are available for comparison. The study has identified some important technical issues in the application of the FW-H acoustic analogy to cavity noise prediction and CAA in general, including the proper selection of the integration period and the modes of sound sources in the frequency domain. The different nature of 2D and 3D wave propagation is also highlighted, which calls for a matching acoustic solver for each problem. The developed hybrid method has shown promise to be a feasible, accurate and computationally affordable approach for CAA. ? Springer Science+Business Media B.V. 2007.