Computations of Shock-Wave/Boundary Layer Interactions Over Fins in Turbulent Flow
Abstract
High speed flows in engineering applications are often characterized by shock-wave/boundary layer interactions (SWBLI) and three-dimensional flows. This thesis aims to study commonly employed turbulence models in the context of configurations featuring SWBLI and 3D flows. Computational Fluid Dynamics (CFD) simulations of flow over a 20 degree isentropic compression curved fin were performed, and the results were compared with published experimental data. Two variations of the Spalart-Allmaras (SA) turbulence model, and two variations of the Menter Shear Stress Transport (SST) turbulence model were tested, and their ability to predict mean flow data was compared. All four models predict the correct flow structure, but the SA models display higher error in predicting Pitot pressure in the curved fin 3D boundary layer. CFD simulations of flow over a sharp fin were performed using the same four turbulence models, and mean flow data were compared to published experimental and computational data. Simulated flow profiles showed good accuracy in the regions away from the shock structure, but did not accurately predict flow in the supersonic regions in the vicinity of the shock wave. Time-accurate IDDES simulations of both configurations were performed, and neither configuration showed any deviation from the steady state solution.
Degree
M.Sc.
Advisors
Blaisdell, Purdue University.
Subject Area
Design|Physics|Fluid mechanics|Mechanics|Thermodynamics|Transportation
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