Calculation of Oscillation Flow in Open Cavity Using Three Sub-grid Scale Models

Three sub-grid scale models are employed to calculate the compressible fluid in a three dimensional rectangular open cavity,which has a length-to-depth ratio of 5.The frequencies of sustained-oscillation in the cavity are in agreement with experimental results and the Rossiter formula.The oscillating energy mainly concentrates on the low frequency areas.The first three modes are the basic frequencies of the flow induced oscillation.The main discrepancies of sound pressure level(SPL)occur in the areas near the fore and aft walls.The results of dynamic Smagorinsky-Lilly(DSM) model are more closer to experimental data than that of Smagorinsky-Lily(SM) model.The results of Wall Adapting Local Eddy Viscosity(WALE) model are the closest to the experimental data.The results of sound pressure level and sound pressure spectrum at the bottom of the cavity demonstrate that WALE model is the best one to predict the self-sustained oscillation of the cavity,while DSM model is fairly good,SM model is slightly inaccurate.