Development of nu(t) - k - gamma Turbulence Model for Computation of Turbulent Flows

被引：0
|
作者：
Choi, Won Chul
Seo, Young Min
Choi, Sang Kyu
Chung, Myung Kyoon
机构：
来源：
TRANSACTIONS OF THE KOREAN SOCIETY OF MECHANICAL ENGINEERS B | 2009年 / 33卷 / 12期
关键词：
Eddy Viscosity; Intermittency; Turbulence Model;
D O I：
10.3795/KSME-B.2009.33.12.1014
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
A new eddy viscosity equation was formulated from assumption of turbulence length scale equation and specific dissipation ratio equation. Then, a set of turbulence model equations for the turbulent kinetic energy k, the viscosity nu(t), and the intermittency factor gamma is proposed by considering the entrainment effect. Closure coefficients are determined by experimental data and resorting to numerical optimization Present model has been applied to compute four representative cases of free shear flows and successfully compared with experimental data. In particular, the spreading rate, the centreline mean velocity and the profiles of intermittency are calculated with improved accuracy. Also, the proposed nu(t) - k - gamma model was applied to channel flow by considering the wall effect and the results show good agreements with the Direct Numerical Simulation data.
引用
收藏
页码：1014 / 1021
页数：8
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