Author(s): Yin Xie; Songdong Shao; Soon Keat Tan

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Keywords: ISPH; Vegetated rough bed; Channel flow; Inflow and outflow; Drag force; Spatially averaged; Submerged

Abstract: In this paper, an incompressible Smoothed Particle Hydrodynamics (ISPH) model is used to simulate the open channel uniform flow over a vegetated rough bed made of submerged vertical cylindrical rods. The SPH technique is a pure Lagrangian modelling approach that used the individual particles to track the flows without a mesh. The incompressibility of the ISPH model is realized by keeping the density of fluid particles to be constant throughout the computations. A two-step solution method is used to solve the ISPH equations and a pressure Poisson equation is used to obtain the fluid pressures. The existence of the cylindrical rods on the channel bed is modelled by adding an additional drag force term into the fundamental hydrodynamic equations. The inflow and outflow boundaries are treated by inserting and removing the fluid particles at the upstream and downstream ends of the computational domain. The ISPH computed velocity profiles in the channel flume have been compared with the PIV measurement data and a good agreement has been found. The results indicated that the ISPH model could provide a promising tool to model similar rough bed flows in a laboratory scale.

DOI:

Year: 2013