Large eddy simulation of flow and mass exchange in an embayment with or without vegetation
Large eddy simulation of flow and mass exchange in an embayment with or without vegetation
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DOI：
10.1016/j.apm.2016.03.026
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发表时间：
2016-09
影响因子：
5
通讯作者：
J. Lu;H. Dai
中科院分区：
文献类型：
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作者：
J. Lu;H. Dai
本文建立了一个三维大涡模拟模型，用于研究有植被和无植被的河道内的流动现象。该模型通过在动量方程中加入植被阻力，考虑了植被的存在。在σ坐标系下实现了质量、动量方程，并采用基于有限差分格式的算子分裂方法。在进口边界处施加合成涡流法产生的脉动速度。首先通过两种情况对模型进行了验证：无植被的直河道河道内的流动和有淹没植被的明渠内的流动。比较结果与实测结果吻合较好。然后应用该模型模拟有植被和/或改变坝宽比的坝内的流动模式和质量交换。最后，对该模型进行了现场应用。
This paper presents a 3D large eddy simulation model to investigate the flow phenomena in an embayment with or without vegetation in a straight channel. This model takes into account the existence of vegetation by adding the vegetation drag force to the momentum equations. The equations of mass, momentum were implemented inσ-coordinate, and the operator splitting method is used based on finite difference schemes. A fluctuating velocity generated by synthetic eddy method is imposed at the inlet boundary. The model is first validated by two cases: flow in an embayment without vegetation in a straight channel, and flow in an open channel with submerged vegetation. The comparisons show a good agreement with the measurements. The model is then applied to simulate flow patterns and mass exchange in the embayment with vegetation and/or varying the embayment aspect ratios. Lastly, the model is applied to the field.