The Numerical Simulation With SPH Method On Wave-damping Performance Of The Submerged Horizontal Plate

In the process of the propagation of gravitational waves in finite water depth, the wave energy on the perpendicular to the direction of wave propagation rapidly decreases with increasing water depth. The transmission of wave energy mainly formed in the region where is between free surface and a third of the still water depth. Hence, a special structure is researched whose superstructure are continuous solid of square box, cylinder, and the plate type rafts et al, could block the transmission of wave energy from open waters, and not negatively influence the view enjoying in the bay. In the meantime, the substruction of the special structure is void. This kind of special structure can be served as safeguard of outskirts of the offshore engineering and activity in the deep waters.Compared with conventional breakwaters, this kind of structures weaken the irrationality of material distribution along the depth direction, which have the merits such as cheap cost, rapid construction, less influence of the seabed terrain, the guarantee of water exchange. So, open-type breakwater has a wide application prospect.Nevertheless, many studies on the special structures stay in the stage of physical experiment measure, gaining wider experience and so on. Repeated modification of physical model and exploration of new structural styles will consume a large amount of test time and cost of model work. The condition of test usually is different and limited and jumpily changed by different experimental environment. Much subtle phenomenon hardly be observed in the experiment modeling. Hence, a mesh free method-SPH is applied to numerical model the interaction of regular wave and the submerged plate in two-dimensional numerical water flume.Furthermore. in order to verify the veracity of the numerical simulation results. the corresponding experiment has been executed. The stability of the generation of regular wave in in two-dimensional numerical water flume has been tested. The article has analyzed and compared the duration curve of the free wave surface in the wave side and the permeable region and the duration curve of the flow velocity in the region beneath the submerged plate. The results of computing model have indicated that the SPH method is suited to model the process of interaction of wave and ordinary geometric structures. The optimizing structure type could be so quickly studied by the SPH method numerical test that can provide necessary reference for the project’s economic construction.At last, applying the numerical model of SPH method, the article analyses the varying flow field and discusses the microscopic reasons for the wave dissipation. Changing the dominating factors of relative plate length and relative submergence depth, it has computed and obtained the changes of reflection and transmission coefficients in detail.