Detached eddy simulations of partially covered and raised cavities

Abstract

The study of cavity flows has played a crucial role in understanding the aeroacoustics and aerodynamics of bodies with cavities. This new understanding has allowed challenges such as reduction in noise levels to be addressed. It has also helped in the reduction of structural resonance and fatigue, and to ensure the proper release of weaponry. In this thesis, a brief study was conducted on the flow-field characteristics of various cavity geometries. These cavities were partially covered, and the depth of the trailing edge of the cavities was varied. The flow field was set at Mach 0.7, and sound pressure levels were obtained using numerical simulations. Detached eddy simulations, which have proven to be successful in previous research work, were used in the present study. The simulations were carried out for a flow time of 0.05 sec. The cavity with the highest trailing edge depth was found to have a greater sound pressure levels; however, no resonance phenomenon was observed. A grid-independency study and a validation study were conducted using detached eddy simulations, and the convergence and stability of the results were investigated.