Development of in/outflow boundary conditions for MPM simulation of uniform and non-uniform open channel flows

Journal article (2019)

Authors

Xuanyu Zhao University of Cambridge
M. Bolognin Hydraulic Structures and Flood Risk - CEG
Lian Donfang University of Cambridge
A. Rohe Deltares
P.J. Vardon Geo-engineering - CEG
Research Group
Hydraulic Structures and Flood Risk (CEG) (TU Delft)
Copyright: © 2019 Xuanyu Zhao, M. Bolognin, Lian Donfang, A. Rohe, P.J. Vardon
DOI
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https://doi.org/10.1016/j.compfluid.2018.10.007
Material point method Inflow/outflow boundary conditions Free overfall Open channel flows
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Published Date

30-01-2019

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Hydraulic Engineering

Research Group

Hydraulic Structures and Flood Risk

Abstract

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.