Numerical investigation of flow-induced oscillations and noise from a rectangular cavity

被引：0

作者：

Wan, Zhen-Hua ^{[1
]}

Zhou, Lin ^{[1
]}

Sun, De-Jun ^{[1
]}

机构：

[1] Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China

来源：

Kongqi Donglixue Xuebao/Acta Aerodynamica Sinica | 2012年 / 30卷 / 03期

关键词：

Boundary layers - Reynolds number - Cavity resonators - Principal component analysis;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

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 recirculation 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.

引用

页码：291 / 298