GPU-Accelerated Large-Eddy Simulations of High-Speed Cavity Flows With Dynamic Doors Deployment

GPU-accelerated wall-modeled large-eddy simulations of the M219 cavity benchmark are performed at Mach M∞ = 0.6, 0.85 and 1.35 for open rectangular cavities of length-to-depth ratio L/D = 5 and 10. Wall-pressure predictions are compared to available Kulite measurements on the cavity floor and show good agreement in terms of tonal noise frequency and amplitude, as well as broadband noise levels and streamwise distribution of pressure fluctuations along the cavity. In particular, the experimental trends for Mach number effect, and cavity aspect ratio dependence and onset of self-sustained Rossiter resonance are well captured in the computations. An additional simulation is performed with generic cavity doors added to the M219 cavity configuration: the inclusion of the opened doors tends to change the dominant mode selected, shift the frequency of the tones present, and increases the magnitude of the pressure fluctuations on the floor of the cavity. As a proof-of-concept demonstration of a novel general-motion capability, the dynamic deployment of the doors is also simulated. Analysis of the opening sequence suggests that weak signature of the first two Rossiter tones becomes detectable around door angle of 30◦, before the resonant mechanism gets fully established when the doors are opened beyond 55◦.