Modelling far-field entrainment in compressible flows |
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Authors: | Renan de S Teixeira |
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Institution: | Departamento de Engenharia Mecanica e de Materiais – SE/4 , Instituto Militar de Engenharia – IME, Pra?a Gal. Tibúrcio no. 80, Praia Vermelha , Rio de Janeiro , RJ , 22290-270 , Brazil |
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Abstract: | A procedure that generates steady-states with accurate far-field entrainment is described here. It can be applied to any existing code originally designed for unsteady simulations. Such steady-states are obtained with physical-time damping, introduced through a dual time stepping methodology to effectively eliminate all transient fluctuations without affecting spatial resolution. Far-field entrainment is guaranteed by using properly selected local boundary conditions. Hence, reference profiles with accurate far-field entrainment are generated from the very same code that will eventually use them in unsteady simulations. This new procedure is tested on an unsteady code designed for compressible planar mixing-layer simulations at arbitrary Mach numbers. It is numerically stable for a wide range of Mach numbers and velocity ratios. |
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Keywords: | planar mixing layers transversal boundary conditions far-field entrainment low-speed flows compressible flow equations |
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