Simulation of Wave and Non-Newtonian Mud Interaction using an ISPH Based on Modified Inter-Particle Average
نویسندگان
1 Assistant Professor, Faculty of Civil Engineering, K.N. Toosi University of Technology, Tehran, IRAN.
2 Professor, Faculty of Civil Engineering, K.N. Toosi University of Technology, Tehran, IRAN.
3 PhD Candidate in Civil Engineering, K.N. Toosi University of Technology, Tehran, IRAN
doi
10.61186/NMCE.2303.1042چکیده
Fluid mud is found in many areas, including coastal area and river estuaries. The typical characteristics of overlaying waves interacting with muddy beds are mud mass transport and high wave attenuation (dissipation). In this study, an Incompressible Smoothed Particle Hydrodynamics (ISPH) method has been developed to simulate the interaction of wave and non-Newtonian mud. A modified inter-particle average technique was used to solve the discontinuity through the interface. An iterative method was applied to update viscous force and to fulfill the requirement of the full incompressibility of the fluid. An improved formulation of viscous force terms, new interface and free-surface treatments have been presented. Some hydrodynamic tests were performed to verify the model by comparing the simulated results with analytical solutions. Several wave-mud simulations were carried out to investigate mass transport velocities and wave attenuation in the mud layer under the different wave and mud characteristics. To validate the results, the simulated results were compared with the laboratory measurements. The new modifications improve the force transferred from the surface wave into the fluid mud and enhance the simulated results in terms of the position of the particles, dissipation rate, and mud mass transport velocity. An intense gradient in the mass transport velocity is found at the water-mud interface.
