线性与非线性紊流模型及其在丁坝绕流中的应用

Application of linear and non-linear turbulent models in spur dike flow

本文采用线性与非线性三维紊流数值模型对丁坝绕流进行了仿真分析。采用的线形紊流模型为Zhu Shih修正的k ε模型,非线性紊流模型为Shih等提出的k ε模型。计算分析了单一丁坝和丁坝群两种不同布置方式下绕流流场的紊动特征,并与实验结果进行了比较。结果表明,非线性模型对平均流场的描述要优于线性模型。文章对非线性模型能提高模拟精度的原因进行了分析。

This paper is concerned with the threedimensional numerical analysis of turbulent flows around submerged spurdikes. Finite volume method is employed to discretize the governing equations. A nonlinear kε model proposed by Shih et al. and a linear kε model modified by ZhuShih are applied to two cases of flow around spurdikes. The comparison with measured data shows that the nonlinear kε model reproduces the mean velocity field better than the modified linear kε model. The reason of the superiority of the nonlinear model is discussed.