Use of a Simple Repulsive Force in Simulating Fluid Flow under a Hypo-Elastic Gate by Smoothed Particle Hydrodynamics

Re-meshing in grid dependent CFD methods in large deformation problems has a high computational cost. Smoothed Particle Hydrodynamics (SPH) is a robust mesh-free method to deal with the problems of large deformation in fluid-solid interactions. Also SPH is a fully Lagrangian particle method، which has a good ability to capture the free surface in two phase flows. In this paper، at first، fluid flow under a gate is solved with the present SPH method and the results are compared with the VOF scheme. For validating the solid part of the code، vibration of a hypo-elastic plate is simulated. Comparing the results with the previous researches show a good agreement. Finally a coupled fluid flow under a hypo-elastic gate is simulated with the present SPH method and the interaction between fluid and solid is obtained with a proposed simple model. In this paper also a simple repulsive force which is independent of the pressure distribution is introduced to prevent the penetration of fluid particles into the solid parts. The results also show the high ability of the present SPH method to follow the fluid- solid interface accurately.