Abstract
Aiming at the complex unsteady flow during the release progress of moving body separating from a cavity, combined with the overlapping grid technique and Spalart Allmaras equation turbulence model, the three-dimensional unsteady flow solver is presented. On this basis, the validity of the simulation method is verified by M219 cavity example and WPFS example. Then the released moving body is conducted with SA-IDES. The research results show that upward force and pitch down moment of the moving body are affected by the fluctuating flow near the cavity and the SA – DES simulation is good in predicting high frequency flow. In conclusion, the outside shear layer and the inside fluctuating flow of the cavity has a significant impact on the aerodynamic loads and the trajectory of the moving body during the initial separation stage.
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