Numerical Simulation Of Wave Interaction With Submerged Porous Breakwater

In coastal and offshore engineering, problems on wave interaction with porous media are often encountered and difficult to deal with. So it have important significance in theory and great applied value of engineering to research the interaction between wave and porous media. In this thesis, numerical simulation of wave interaction with submerged porous breakwater is conducted. At first, computational model is established. Navier-Stokes Equation based on k-εmodel is adopted in waves field and Forchheimer Equation in porous flow within the breakwater. The finite difference method (FEM) is employed to resolve governing equations and VOF method is used to trace free surface. By introducing a Velocity –Pressure Correction Equation for the waves and porous flow, highly efficient coupling between the two flows is realized. The two flows can be solved simultaneously and no boundary condition is needed on the interface between them. The implicitly limitation of Continuity Equation makes it sure that the velocity and pressure of the two flows on the interface keep to equal at any time. In the dissertation, the changing law of wave height before and after the breakwater and the pore pressure in it are discussed, also the details of the velocity of the whole flow field are described. Finally, experiments are conducted for wave interaction with submerged porous breakwater. Comparison between numerical and experimental results shows good agreement between them. It shows that the numerical computation method this paper established can successfully simulate wave interaction with porous submerged breakwater.