3 Numerical Simulation of turbulent Flow Over a Cavity

Cavity flow and control of these flows have been of great importance for military as well as civil applications. Modern aircraft with internal carriage of weapon require active flow control techniques to ensure the structural in-tegrity by limiting the open bay acoustic resonance and efficient payload de-ployment. To implement these techniques it is important to understand the flow features and identify the source of resonance. Detached Eddy Simulation (DES) is carried out for subsonic flow (M = 0.85) over a three dimensional cavity with Reynolds number based of cavity length equal to 7 × 106. A good comparison with the available experimental data for the similar con-figuration validates the DES results. Special attention is paid towards the prediction of unsteady pressure fluctuations and mixing layer and the result-ing tonal modes due to their interaction. Furthermore, the instantaneous and mean flow structures inside the cavity are compared with the available Large Eddy Simulation (LES) data, showing a good agreement with sligh