Development of in/outflow boundary conditions for MPM simulation of uniform and non-uniform open channel flows
Development of in/outflow boundary conditions for MPM simulation of uniform and non-uniform open channel flows
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DOI：
10.1016/j.compfluid.2018.10.007
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发表时间：
2019-01
影响因子：
2.8
通讯作者：
Xuanyu Zhao;M. Bolognin;D. Liang;A. Rohe;P. Vardon
中科院分区：
文献类型：
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作者：
Xuanyu Zhao;M. Bolognin;D. Liang;A. Rohe;P. Vardon
本文介绍了模拟流体流动问题的物质点法(MPM)的流入流出边界条件(BCS)的发展和应用。这对应于速度和压力控制的BCS。由于MPM中流体运动的拉格朗日和欧拉耦合描述，有必要在计算域中添加和删除具有适当运动学性质的物质点。用新开发的BCS模拟了明渠均匀流和明渠自由溢流现象，这是由于床面骤降而导致非均匀流的暂态现象。结果表明，数值模拟结果较好地预测了水流的几何形状，包括端深比、压力分布和加速度，进而预测了流速和位移。
This paper describes the development and application of inflow and outflow boundary conditions (BCs) for the material point method (MPM) in order to simulate fluid flow problems. This corresponds to velocity and pressure controlled BCs. Due to the coupled Lagrangian and Eulerian description of the fluid motion in MPM it is necessary to add and remove material points, with appropriate kinematic properties, to and from the computational domain. The newly-developed BCs have been used to simulate uniform open channel flow and the phenomenon of free overfall in open channels, which is transient conditions leading to non-uniform flow due to a sudden bed level drop. It is shown that the numerical results predict well the flow geometry including end depth ratio, pressure distribution and accelerations, therefore the velocities and displacements.