The flow field around a cavity is unsteady and highly dynamic - it is dominated by strong vortical structures, intense aeroacoustics and very high levels of turbulence. The nature of the flow field is further complicated by the strong interaction between the turbulence and aeroacoustics resulting in feedback driven resonant phenomena. At CRAFT Tech, a fundamental approach, using Large Eddy Simulation (LES) techniques is being used to study basic cavity flows. For realistic weapons bay applications, a hybrid RANS-LES methodology has been developed which combines the fidelity of LES with the cost effectiveness of RANS. In order to handle the complex geometries and moving body problems associated with store separation applications, unstructured methods have been developed in conjunction with mesh adaption and moving mesh techniques. Recent work has involved both passive and active control of cavity aeroacoustics.

Sinha, N., Arunajatesan, S., and Seiner, J., “Computational and Experimental Investigations Of Cavity Attenuation Using High Frequency Control,” AIAA-2002-2403, 8th AIAA/CEAS Aeroacoustics Meeting, Breckinridge, CO, June 17-19, 2002.

Arunajatesan, S.A., Shipman, J., and Sinha, N., “Hybrid RANS-LES Simulation of Cavity Flowfields with Control,” AIAA-2002-1130, 40th AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, January 2002.

Arunajatesan, S., Sinha, N. and Ukeiley, L., “On the Application of Hybrid RANS-LES and Proper Orthogonal Decomposition Techniques to Control of Cavity Flows,” Third AFOSR Interntl Conf on Direct Numerical Simulation and LES (TAICDL), Arlington, TX, USA, August 5-9, 2001.

Sinha, N, and Arunajatesan, S., and Ukeiley, L., “High Fidelity Simulation Of Weapons Bay Aeroacoustics Attenuation Using Active Flow Control,” AIAA-2000-1968, 6th AIAA/CEAS Aeroacoustics Conference, Lahaina, Hawaii, June 12-14, 2000.