对 k-ω 湍流模型的改进
AN IMPROVEMENT OF k-ω TURBULENT MODEL
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摘要: 为了更适合于较复杂几何外形的数值计算,本文提出仅引入1个参数来改进k-ω湍流模型并采用了一种双网格系统的有限体积格式来求解N-S方程与改进的的k-ω模型方程。通过平板附面层的计算结果表明了用本文提出的对k-ω湍流模型的改进对控制转捩是有效的。Abstract: The k-ω turbulence model for predicting turbulence transition at a local Reynolds number lower than that observed in experiments.Wilcox suggested an approach to predict transition through modifying the viscosity in the ω equation with five more closure coefficients,but the approach maded the model too complicated.Here we introduce only one simple parameter to improve the model.An inequality is proposed to set a lower limit for the specific dissipation.In order to make the Navier-Stokes equations and k-ω equations strongly coupled,a staggered finite volume scheme for discretizing the N-S equations and the k-ω model equations has been developed.The algorithm was tested for a flat plate flow.Computational results shows that the present improvement of the k-ω turbulence model to control the transition position is effective.
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Key words:
- Turbulent flows /
- Mathematical models /
- Transition points /
- Boundary layer
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