空气动力学学报2012，Vol.30Issue(3)：291-298,8.
方腔流致振荡及噪声的数值研究
Numerical investigation of flow-induced oscillations and noise from a rectangular cavity
摘要
Abstract
Direct numerical simulation is used to investigate flow-induced oscillations and noise for a low-Reynolds-number subsonic flow over a rectangular cavity with a constant configuration L/D = 2. The results indicate that oscillations are dominated by Rossiter Ⅱ mode in the range of present computational parameters. A low frequency component appears as the decreasing of the thickness of inflow boundary layer, which is directly caused by pattern switching of vortex-edge impingement. The inherent reason is unstable interaction between the recireulation zone and the shear layer. The proper-orthogonal-decomposition (POD) method is employed to analyze the influence of different oscillation pattern on the corresponding vortex structures of the intrinsic mode and its relation with vortex-edge interaction. Moreover, the process of noise generation and propagation is computed and analyzed, and the results are agreed well with available experiments and analytical model.关键词
开式方腔流动/流致振荡/噪声Key words
open cavity flow/ flow-induced oscillations/ noise分类
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万振华,周林,孙德军..方腔流致振荡及噪声的数值研究[J].空气动力学学报,2012,30(3):291-298,8.基金项目
国家自然科学基金(111072238) （111072238）
