A three-dimensional hyhrid LES-Acoustic analogy method for predicting open-cavity noise

作者：Lai Huanxin; Luo Kai H

来源：Flow, Turbulence and Combustion, 2007, 79(1): 55-82.

DOI：10.1007/s10494-006-9066-y

• Ffowcs Williams-Hawkings analogy
• large-eddy simulation
• hybrid methods
• three-dimensional implementation
• cavity acoustics
• computational aeroacoustics

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 x 10(6), 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 intcgration 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.

• 出版日期2007
• 单位东华大学