AuthorO. Sahni, C.D. Carothers, M.S. Shephard and K.E. Jansen
TitleSimulation of Flow Control in a Serpentine Duct
JournalProceedings of the 47th AIAA Aerospace Sciences Meeting and Exhibit
Abstract Three dimensional numerical computations of flow control within an aggressive ser- pentine inlet duct (L/D = 1.5) at a Mach number of M = 0.45 are presented. Two flow configurations including baseline flow (no flow control) and active flow control via steady, tangential control jet are considered. A stabilized finite element method is employed to perform turbulence simulations16 using two variants of the Spalart-Allmaras (S-A) model; the original S-A one-equation model29 in an unsteady Reynold-averaged Navier-Stokes simulation (URANSS) and a hybrid S-A model30 in a Detached eddy simulation (DES). Furthermore, computations are performed using adaptive meshing techniques developed for unstructured grids including boundary layer elements24 to make such flow simulations practically feasible and efficient. Numerical results using two turbulence models are com- pared with experimental measurements33 of static and total pressure for the baseline flow whereas numerical results based on URANSS and DES are compared in the case of flow control. Results obtained from URANSS using the original S-A model fail to predict key aspects of this complex flow with adverse pressure gradient and flow separation, whereas DES substantially improves the prediction.
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