Velocity distribution in compound channel flows by numerical modeling
Velocity distribution in compound channel flows by numerical modeling
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DOI：
10.1061/(asce)0733-9429(1994)120:10(1176
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发表时间：
1994-10
影响因子：
2.4
通讯作者：
G. Pezzinga
中科院分区：
文献类型：
--
作者：
G. Pezzinga
本文研究了用非线性 k-e 模型预测复合通道中均匀湍流的问题。该模型能够预测由正常湍流应力的各向异性引起的二次流，这是复合通道中流动的重要特征，因为它们决定了横向动量传递。该模型用于重现文献中提供的实验运行。比较表明，该模型准确地预测了一次速度分量、二次环流和流量分布的分布。数值结果用于基于流场搜索主河道和漫滩之间的细分表面，并通过简单的均匀流公式基于流量分布来比较不同的细分表面。模型预测的更好的细分表面是从主河道和洪泛区之间的拐角处到...上的自由表面的对角表面。
The paper examines the problem of prediction of uniform turbulent flow in a compound channel with the nonlinear k‐e model. This model is capable of predicting the secondary currents, caused by the anisotropy of normal turbulent stresses, that are important features of the flow in compound channels, as they determine the transverse momentum transfer. The model is applied to reproduce experimental runs available in the literature. The comparison shows that the model predicts with accuracy the distribution of the primary velocity component, the secondary circulation, and the discharge distribution. The numerical results are used to search a subdivision surface between main channel and floodplain on the basis of the flow field and to compare different subdivision surfaces on the basis of the discharge distribution by a simple uniform flow formula. The better subdivision surfaces as predicted by the model are the diagonal surface going from the corner between main channel and floodplain to the free surface on ...