Application and Comparison of Two SGS Models in Large Eddy Simulation of FreeTurbulent Jet Flow  

作　　者：Hong YAN and Mingde SU (Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China) 

出　　处：《Communications in Nonlinear Science and Numerical Simulation》1999年第1期12-19,共8页非线性科学与数值模拟通讯（英文版）

摘　　要：Large eddy simulations of spatially evolved turbulent round jets were presented. The two SGS models called the standard Smagorinsky’s eddy viscosity model and the non-eddy viscosity stimulated small scale(SSS) model developed by Shah & Ferziger were applied. The Reynolds number of the flow was taken as 10000 based on the orifice diameter and the axial velocity in the orifice. The comparison between these two models showed that the standard Smagorinsky’s viscosity model with Smagorinsky’s constant of 0.1 underestimated the turbulent intensity, while the SSS model showed a better agreement with the experiment. Also the SSS model was used to investigate the development of vortex. The convective boundary condition at the outflow boundary was adopted to ensure less effect of noise on the upstream.Large eddy simulations of spatially evolved turbulent round jets were presented. The two SGS models called the standard Smagorinsky's eddy viscosity model and the non-eddy viscosity stimulated small scale(SSS) model developed by Shah & Ferziger were applied. The Reynolds number of the flow was taken as 10000 based on the orifice diameter and the axial velocity in the orifice. The comparison between these two models showed that the standard Smagorinsky's viscosity model with Smagorinsky's constant of 0.1 underestimated the turbulent intensity, while the SSS model showed a better agreement with the experiment. Also the SSS model was used to investigate the development of vortex. The convective boundary condition at the outflow boundary was adopted to ensure less effect of noise on the upstream.

关 键 词：stimulated small scale model smagorinsky's eddy viscosity model Round jet  Large eddy simulation 

分 类 号：O358[理学—流体力学]