APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Application of a New Hybrid RANS/LES Modeling Paradigm to Compressible Flow

摘要

It is well-known that traditional hybrid RANS/LES modeling approachessuffer from a number of deficiencies. These deficiencies often stemfrom overly simplistic blending strategies based on scalar measures ofturbulence length scale and grid resolution and from use of isotropicsubgrid models in LES regions. A recently developed hybrid modelingapproach has shown promise in overcoming these deficiencies inincompressible flows [Haering, 2015]. In the approach, RANS/LESblending is accomplished using a hybridization parameter that isgoverned by an additional model transport equation and is driven toachieve equilibrium between the resolved and unresolved turbulence forthe given grid. Further, the model uses an tensor eddy viscosity thatis formulated to represent the effects of anisotropic grid resolutionon subgrid quantities. In this work, this modeling approach isextended to compressible flows and implemented in the compressibleflow solver SU2 (http://su2.stanford.edu/). We discuss both modelingand implementation challenges and show preliminary results forcompressible flow test cases with smooth wall separation.