MPS-based simulation of dam-break wave propagation over wet beds with a sediment layer

Abstract

In this study, a two-phase mesh-free method is employed to simulate the dam-break wave propagation along different wet bed conditions in the presence of sediment. The method is based on the mixture theory and volume fraction is incorporated for both water and sediments. The pressure Poisson equation is explicitly solved to obtain the pressure field for the water and the pressure field for the sediment is calculated by using the rheology model. The method is validated by simulating submerged granular column collapse and dam-break flow over a sediment layer. The method can reproduce the interface variation between water and sediment. The validated model is then used to simulate the dam-break wave propagation in the presence of both downstream water and sediment. Different dam-break waves induced by the upstream water depths are simulated and it is found that the dam-break wave can make the sediment move violently. The larger downstream water depth can slow down the sediment movements while the sediment movements are violent for shallower water downstream.