Large-eddy simulation of a compressible flow in a three-dimensional open cavity at high Reynolds number

摘要: Large-eddy simulations of a subsonic three-dimensional cavity flow with self-sustaining oscillations are carried out for Reynolds number based on the length equal to $7\,{\times}\,10^6$ . Meticulous comparisons available experimental data corresponding same configuration demonstrate high level accuracy. Special attention is paid mixing layer that develops over and two different zones identified. The first one dominated by Kelvin–Helmholtz instability, linear as well quadratic energy transfers leading filling velocity spectra described. instability also appears be forced near origin layer, it postulated small recirculation bubble located in this area responsible forcing. Downstream zone up vicinity aft wall, behaves very similarly free exhibiting spreading. An influence recirculating inside upon growth nevertheless observed at downstream stations. Analysis pressure floor reveals oscillation-related modes (Rossiter modes) independent their spanwise location cavity. On contrary, Rossiter exhibit streamwise modulations demonstrated simple two-wave model able reproduce spatial shape modes. Nonlinear interactions between encountered, nonlinear low-frequency components. A joint time–frequency analysis shows temporal modulation mode levels similar low frequencies, resulting special form intermittency competitive exchanges