Numerical behaviour of a new LES model with nonlinear viscosity

JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS

卷:377

Article

Rodriguez, J. M.¹  Taboada-Vazquez, R.¹ 

[1] Univ A Coruna, Dept Matemat, La Coruna 15071, Spain

关键词: Large Eddy Simulation;    Nonlinear viscosity;    Backward Facing Step Flow test;   

DOI  :  10.1016/j.cam.2020.112868

来源: Elsevier

【 摘 要 】

The objective of this paper is to present a new Large Eddy Simulation (LES) model obtained by filtering a generalized version of the Navier-Stokes equations with nonlinear viscosity. This new model is a generalization of the model introduced in Rodriguez and Taboada-Vazquez (2017). The new LES model, in which viscosity has been substituted by a nonlinear function of the strain rate tensor, has been implemented and validated using FreeFem++ codes. The numerical predictions have been compared with analytical solutions of the Navier-Stokes equations and it was found that the present model provides a more accurate approximation of the exact solution than that obtained by Direct Numerical Simulation (DNS) of the Navier-Stokes equations, even using a coarser mesh. The model has also been validated by studying the unsteady flow over a backward-facing step. In this case, our numerical predictions have been compared with the experimental measurements reported by Armaly et al. (1983) and the numerical results obtained by Chacon and Lewandowski (2014). The new model performs satisfactorily in predicting these flows too. (C) 2020 Elsevier B.V. All rights reserved.

【 授权许可】

Free