Collision-reflection model for modeling the wall boundary condition in SPH

Two patterns of the Collision-Reflection models, i.e. Specular Reflection and Maxwellian Reflection, were imported to respectively simulate the slip wall boundary condition and non-slip wall condition in SPH. Using the former pattern, the case of non-viscous Bursting Dam flow was simulated, and the results were compared with the data published by other researchers and that obtained using Lennard-Jones boundary force. Using the Latter pattern, the viscous low Reynolds number Poiseuille flow was simulated, and the results was compared with the Series solution and the solution obtained using Ghost Particle method. Corresponding to non-viscous and viscous flows, the results show small differences, it indicates that the Collision-Reflection model is adaptive to both the slip wall and non-slip wall condition.