PERFORMANCE OF LAGRANGIAN DYNAMIC SMAGORINSKY MODEL : Large eddy simulation of turbulent flow past 2D square cylinder using dynamic SGS model (Part 3)

摘要

The lagrangian dynamic subgrid-scale (SGS) model proposed by Meneveau et al. (1994) was implemented and tested for a turbulent flowfield past a 2D square cylinder at Re=2.2×104. This model improves the usual type of dynamic Smagorinsky model by minimizing the error of the algebraic identity along fluid trajectories. This is realized numerically by solving two simple relaxation transport equations. It was confirmed that this model contributes to improvement of calculation stability and provides more accurate results than does the usual type of dynamic Smagorinsky model.