Application and Comparison of Pressure and Velocity Correction Methods and Boundary Conditions in WCSPH Method for numerical modelling of 3D Inviscid Fluid Flow

In this paper, Weakly Compressible Smoothed Hydrodynamic (WCSPH) method was used to numerically simulate the three dimensional dam-break with obstacle in front of the flow. Euler equations as governing equations of inviscid fluid flow were used. Large and unphysical oscillations in pressure and velocity field are one of the most important problems in this method. In present study using density filter and conservative Riemann solvers, these oscillations was controlled and results of these two methods were compared with experimental data. Furthermore due to common using of artificial viscosity in WCSPH method, the simulation was implemented using artificial viscosity in momentum equations without density filtering and compared with last two methods. This comparison showed that the conservative Riemann solvers could well control the oscillations in pressure and velocity field and gives correct pressure results in WCSPH method. Finally two boundary conditions called dynamic and Repulsive forces were investigated in this paper.