AN IMPROVED DYNAMIC SUBGRID-SCALE STRESS MODEL

作者：Tang Xue ling^*; Qian Zhong dong; Wu Yu lin; Liu Shu hong; Yang Fan

来源：Journal of Hydrodynamics, 2004, 16(3): 276-282.

• Sub-Grid-Scale (SGS) model
• second-order dynamic model
• Large Eddy Simulation (LES)
• turbulent flow
• curved duct

According to modeling principle that a model must be more accurate if including more flow information, and based on the Cauchy-Helmholtz theorem and the Smagorinsky model, a second-order dynamic model with double dynamic coefficients was proposed by applying dimension analyses. The Subgrid-Scale (SGS) stress is a function of both strainrate tensor and rotation-rate tensor. The SIMPLEC algorithm and staggering grid system was applied to give the solution of the discretized governing equations, and for the turbulent flow through a 90 bend, the distributions of velocity and pressure were achieved. The comparison between experimental data and simulation results at a Reynolds number 40000 shows a good agreement and implies that this model is practicable and credible.

• 出版日期2004
• 单位清华大学