Missile Aeroacoustic Response Modeling

"Dynamic pressure loads on missile airframes can produce severe vibrations which can be transmitted to sensitive internal components. Our Phase I effort initiated the development of a high fidelity computational package to predict such loads. A hybridRANS-LES framework was made operational analyzing loads from lateral jet firings and preliminary studies of AIT dynamic events (divert jet firings and shroud separation) were analyzed, including structural response analyses. For Phase II, we willinvestigate altitude dependencies on divert jet-induced loads expecting the most severe loads to occur in the 30-50km regime, where the flow is transitional. We will also investigate dynamic loads associated with AIT shroud separation and CKEM stageseparation events to minimize dynamic loads. Application of smart material technology for missile shells applications will be examined and experiments performed. Our work will utilize sub-scale and large-scale (LENS) test data and inclusion of smartmaterial fluid/structural coupling procedures. For missile systems such as X-ROD where divert jets impact on fins, use of an advanced unstructured code (with plume thermochemistry) will be utilized to perform aero-elastic calculations. We will besupported by Dr. Seiner/NCPA-U. Miss and Prof. Farhat/Univ. of Colorado in this effort, who are experts in aeroacoustics and structural response."