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http://dx.doi.org/10.3795/KSME-B.2009.33.12.1014

Development of νt-κ-γ Turbulence Model for Computation of Turbulent Flows  

Choi, Won-Chul (한국과학기술원 기계공학과)
Seo, Young-Min (두산인프라코어)
Choi, Sang-Kyu (삼성중공업(주) 조선해양연구소)
Chung, Myung-Kyoon (한국과학기술원 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.33, no.12, 2009 , pp. 1014-1021 More about this Journal
Abstract
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 ${\kappa}$, 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 ${\nu}_t-{\kappa}-{\gamma}$ model was applied to channel flow by considering the wall effect and the results show good agreements with the Direct Numerical Simulation data.
Keywords
Eddy Viscosity; Intermittency; Turbulence Model;
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