湍流
Kε湍流模型
雷诺平均Navier-Stokes方程
湍流模型
喷射(流体)
K-omega湍流模型
非线性系统
流量(数学)
机械
物理
计算流体力学
统计物理学
工作(物理)
湍流动能
计算机科学
经典力学
应用数学
数学
热力学
量子力学
作者
Ashraf Balabel,W.A. El-Askary
标识
DOI:10.1016/j.euromechflu.2010.10.006
摘要
In this paper, a thorough numerical investigation of the performance of several linear and nonlinear k–ε turbulence model variants in various jet flow applications is carried out. Three k–ε based turbulence models are considered, namely the standard k–ε model, the υ2–f model, and the nonlinear k–ε model. The selected turbulence models are applied for the prediction of simple as well as complex jet flow applications to underpin knowledge about the accuracy obtained from the two-equation turbulence models. The numerical code developed by the present authors solves the unsteady RANS equations by using the control volume approach on a non-staggered grid system. Three jet flow applications are selected, namely a turbulent free jet, a turbulent jet impinging on a flat plate, and a turbulent wall jet. In order to validate the numerical results obtained and to investigate the performance of the different turbulence models considered, different experimental measurements from the literature are used. The present work is primarily motivated by the desire to provide a rational way for deciding how complex the turbulence model is required to be for a given application and to find out how the accuracy changes with model complexity. Due to the superior predictive performance of modern turbulence models in a wide range of complex industrial and engineering applications, it was believed that a 'universal' turbulence model might exist. In general, that is not true. Simple flows can be analysed using standard two-equation models. The present numerical investigation showed that the linear turbulence model could give good results in simple (non-impinging) jet flows. However, in complicated flows, such as impinging jet problems or wall jet flows, a more elaborate level of modeling is required. In such contexts, nonlinear models are appropriate for predicting the turbulent viscosity structure, namely the inhomogeneous near-wall flow region and the anisotropic Reynolds stresses, which is a vital part of turbulent jet flow prediction.
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