A k-Ω-kθ-Ωθ four parameter logarithmic turbulence model for liquid metals

被引：19

作者：

Da Via, R. ^{[1
]}

Manservisi, S. ^{[1
]}

Menghini, F. ^{[1
]}

机构：

[1] Univ Bologna, DIN, Lab Montecuccolino, Via Colli 16, I-40136 Bologna, Italy

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2016年 / 101卷

关键词：

Turbulent heat transfer; Turbulence modeling; Logarithmic formulation; PREDICTING FLUID-FLOW; HEAT-TRANSFER; REATTACHING FLOWS; REYNOLDS; SIMULATIONS;

D O I：

10.1016/j.ijheatmasstransfer.2016.05.084

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Turbulence modeling is one of the main issues when dealing with Computational Fluid Dynamics simulations. Models based on the Reynolds Averaged Navier Stokes equations are commonly used in several applications but, for liquid metals, the constant turbulent Prandtl number approximation leads to overestimate the heat transfer. In this work we propose a new k-Omega-k(theta)-Omega(theta) turbulence model which improves the k-epsilon-k(theta)-epsilon(theta) four parameter model presented in [1]. The main difficulties encountered in the numerical implementation of the k-epsilon-k(theta)-epsilon(theta) model are the nonlinear boundary conditions in k theta-epsilon(theta) and the evaluation of the characteristic near wall times. By introducing the logarithmic variables Omega and Omega(theta) in order to avoid negative values, we can easily set appropriate boundary conditions and improve numerical stability. The new formulation of the model is validated and compared with Direct Numerical Simulation data and experimental correlations. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：1030 / 1041

页数：12

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