Abstract
A hybrid rans-les method with compressible k-omegaSSTSAS turbulence model for high Reynolds number flow applications
Highlights
Accurate analysis and simulation is essential for the design challenges in aerospace industry
The Computational Fluid Dynamics (CFD) has become a relevant supplement to the wind tunnel and flight tests
An optimum choice of relaxation factor α is a matter of compromise – it should be small enough to ensure stable computation, and large enough to lead the iterative process towards the convergence quickly
Summary
Accurate analysis and simulation is essential for the design challenges in aerospace industry. The general idea of here applied hybrid method is to provide a turbulence model which is capable of allowing LES-predictions to a certain extent with a lower computational effort, in comparison with full LES simulations This is achieved by leaving a part of the flow to the RANS model. While the "LESmode" of the hybrid model resolves the unsteady flow in the free stream, the relaxation of the mesh resolution requirements lowers the computational effort, in contrast to the full LES simulations. This relaxation falls back on the application of the "RANS-mode" in the boundary layer, which does not require cubic cells in the corresponding region [5]. The coupling between RANS and LES acts in a fashion similar to the widely used wall-functions in RANS, i.e. the RANS solver takes information from the computed LES flow field, and returns back the results in the form of wall fluxes, i.e. like the shear stress and heat transfer at the wall [16]
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