Bend-Flow Simulation Using 2D Depth-Averaged Model
Bend-Flow Simulation Using 2D Depth-Averaged Model
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DOI：
10.1061/(asce)0733-9429(1999)125:10(1097
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发表时间：
1999-10
影响因子：
2.4
通讯作者：
H. Lien;T. Hsieh;Jinn‐Chuang Yang;K. Yeh
中科院分区：
文献类型：
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作者：
H. Lien;T. Hsieh;Jinn‐Chuang Yang;K. Yeh
本文的目的是提出一个二维深度平均模型，用于模拟和检查在渠道弯曲的流态。特别是，本文提出了一个二维深度平均模型，考虑到二次流现象的影响，通过计算的分散应力所产生的平均和真实的速度分布之间的差异的产品的集成。该模型采用正交曲线坐标系，可以高效、准确地模拟不规则边界的流场。在数值求解过程中，采用由离散步骤和传播步骤组成的两步分裂算子方法，采用交错网格对流动控制方程进行数值求解。来自de Vriend和Koch以及Rozovskii的两组实验数据被用来证明该模型的能力。前者的数据集是从一个轻度弯曲的渠道，而后者是从一个急剧弯曲的渠道。考虑二次流影响的数值模拟结果与实测数据吻合较好。此外，弥散应力项的检查表明，弥散应力在横向对流中起着重要作用的动量从内银行转移到外银行的流动，在温和的和尖锐的弯曲。
The purpose of this paper is to present a 2D depth-averaged model for simulating and examining flow patters in channel bends. In particular, this paper proposes a 2D depth-averaged model that takes into account the influence of the secondary flow phenomenon through the calculation of the dispersion stresses arisen from the integration of the products of the discrepancy between the mean and the true velocity distributions. The proposed model uses an orthogonal curvilinear coordinate system to efficiently and accurately simulate the flow field with irregular boundaries. As for the numerical solution procedure, the two-step split-operator approach consisting of the dispersion step and the propagation step with the staggered grid is used to numerically solve the flow governing equations. Two sets of experimental data from de Vriend and Koch and from Rozovskii were used to demonstrate the model’s capabilities. The former data set was from a mildly curved channel, whereas the latter was from a sharply curved channel. The simulations considering the secondary flow effect agree well with the measured data. Furthermore, an examination of the dispersion stress terms shows that the dispersion stresses play a major role in the transverse convection of the momentum shifting from the inner bank to the outer bank for flows in both mild and sharp bends.