A modified wall-adapting local eddy-viscosity model for large-eddy simulation of compressible wall-bounded flow

The wall-adapting local eddy-viscosity (WALE) model in large-eddy simulation can well predict wall-bounded flows but it is also well known for excessive dissipation. In this study, we apply the minimum-dissipation model to constrain the WALE model in compressible flows and obtain the coefficient of the WALE model. Through this process, the dissipation of WALE model can be lower while it still maintains strong stability. In the modified WALE model, the isotropic part of the subgrid-scale (SGS) stress is also reconstructed. In the filtered total energy equation, all of the extra SGS unclosed terms (besides SGS stress and SGS heat flux) are modeled instead of neglecting some SGS terms, such as the SGS viscous diffusion. The modified WALE model is tested in a compressible turbulent channel flow and a supersonic turbulent boundary layer over a compression corner. The new model can well predict the mean velocity, the mean temperature, the Reynolds stress, and the separation bubble. Published under an exclusive license by AIP Publishing.

Automated summary

In this study, the wall-adapting local eddy-viscosity (WALE) model is improved by applying the minimum-dissipation model and reconstructing the isotropic part of the subgrid-scale (SGS) stress. The modified WALE model demonstrates lower dissipation and strong stability in compressible flows. It is tested in compressible turbulent channel flow and supersonic turbulent boundary layer, showing good predictions for various flow parameters.