Large-eddy simulation of turbulent free surface flow over a gravel bed

Large-eddy simulation of turbulent free surface flow over a gravel bed
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砾石层上湍流自由表面流的大涡模拟

DOI:
10.1080/00221686.2021.1908437
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发表时间:
2021
影响因子:
2.3
通讯作者:
Xie Z
Xie Z
中科院分区:
工程技术3区
文献类型:
--
作者:
Xie Z

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本文提出了天然粗糙床上湍流自由表面流的大涡模拟研究。采用三维多相流模型来研究粗糙度对湍流特性和自由表面动力学的影响。使用有限体积法对控制方程进行离散化,并采用笛卡尔切割单元法来处理精确扫描的砾石床地形,并通过体积流体法捕获可变形自由表面。预测的平均流速和湍流统计数据已与实验数据进行了比较。两组结果之间取得了密切的一致,证实了这种实验研究的补充方法可以进一步深入了解粗糙床上的湍流自由表面流动动力学。研究发现,在相对低的浸没情况下,由于粗糙度效应,自由表面上会产生小波浪。
In this paper, a large-eddy simulation study of turbulent free surface flow over a natural rough bed is presented. A three-dimensional multiphase flow model is employed to study the roughness effects on the turbulence properties and free surface dynamics. The governing equations have been discretized using the finite volume method, with the Cartesian cut-cell method being implemented to deal with the precise scanned gravel bed topography and the deformable free surface being captured by a volume of fluid method. The predicted mean flow velocities and turbulence statistics have been compared with experimental data. A close agreement has been obtained between the two sets of results, providing confirmation that this complementary approach to experimental investigations gives further insight into the turbulent free surface flow dynamics over rough beds. It is found that small waves are generated on the free surface due to the roughness effect for the relative low submergence case.
以不规则粗糙度为界的粗糙湍流通道流的大涡模拟:几何参数的作用
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