SPHysics simulation of laboratory shallow free surface turbulent flows over a rough bed
SPHysics simulation of laboratory shallow free surface turbulent flows over a rough bed
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DOI：
10.1080/00221686.2017.1410732
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发表时间：
2018-01-01
影响因子：
2.3
通讯作者：
Nichols, Andrew
中科院分区：
文献类型：
--
作者：
Gabreil, Eslam;Tait, Simon J.;Nichols, Andrew
本文用光滑粒子流体动力学方法模拟了规则排列均匀球体粗糙床面上的浅自由面湍流流动。数值计算程序基于开放源代码SPHysics，并在湍流模型和粗糙床处理方面进行了重大改进。提出了一个改进的亚颗粒尺度涡粘性模型来模拟高剪切自由表面流中湍流传输机制的影响，并在动量方程中引入了拖曳力项作为源项来考虑床面粗糙度的存在。为了验证数值模型，进行了实验室实验，以研究在不同的流动条件下的浅，湍流的流动行为。SPH模拟，然后通过声学多普勒测速仪测量的流速，剪切应力和湍流强度剖面进行比较。粗糙床水力学方面的几个问题进行了调查，包括水面行为及其与整体流量的相互作用的研究。
In this paper, the smoothed particle hydrodynamics method is used to simulate experimental shallow free surface turbulent flows over a rough bed made of regularly packed uniform spheres. The numerical program is based on the open source code SPHysics and significant improvement is made in the turbulence modelling and rough bed treatment within the code. A modified sub-particle-scale eddy viscosity model is proposed to simulate the effect of turbulence transfer mechanisms in the highly-sheared free surface flow, and a drag force term is introduced into the momentum equation as a source term to account for the existence of the bed roughness. To validate the numerical model, a laboratory experiment is carried out to study shallow, turbulent flow behaviour under different flow conditions. The SPH simulations are then compared with the flow velocity, shear stress and turbulent intensity profiles measured via acoustic doppler velocimeters. Several issues with regard to the rough bed hydraulics are investigated, including the study of water surface behaviour and its interaction with the bulk flow.