A dynamic sub-grid scale model for large eddy simulation of turbulent flows in a lid-driven cubical cavity

摘要

This work undertakes a numerical study of turbulent incompressible flows in lid-driven cubical cavities using Large Eddy Simulation and two sub-grid scale models, i.e., the WALE (Wall-Adapting Local Eddy-viscosity) model and the corresponding dynamic sub-grid model (DSGS). In the process of using DSGS, an optimal value of constant C_W of the WALE model was determined for a pre-set Reynolds number Re=10~4. The computed numerical results showed very good agreement with those Direct Numerical Simulation (DNS) results and with the experimental measurements found in the literature. Optimal values of C_W were determined afterwards with the DSGS model and they were proposed for the analysis of higher Reynolds number turbulent flows. At the end, a power law correlation between C_W and Re was proposed for the range 10~4≤Re≤3×10~4.