Nonlinear Wave Numerical Simulation Of The Action Between Wave And Perforated Caisson Breakwater

The breakwater structure pattern research and development always pays widely attention in the ocean engineering building. In recent years, the front board perforated caisson breakwater (namely to perforated structure with caisson) becomes one of the main forms because of economize, good performance for wave-damping and suitable for deep water, has widely engineering application prospect. It is urgent demand for thoroughly discusses the wave-damping effectiveness mechanism of perforated caisson and establishes less-reflection breakwater numerical computation mode pattern.In view of perforated caisson breakwater complex structure pattern, this paper is based on two dimensions Laplace equation and boundary condition, obtains the integral equation after Green transformation; use 0-1 combined type BEM to establish discrete boundary integral equation with potential function and its normal derivatives as unknown quantity in node; use sub-domain scheme of BEM method to divide the calculate field into certain subfields, then utilize neighboring subfield interface continual condition, establishes gradually solves value relations of each subfield, and then gradually solves linear equations of all of the calculate field. Through circulation iteration with presuppose precision in time step, completes the wave surface tracing computation in time domain, and establishes a strong nonlinear numerical mode to be suitable in the perforated caisson breakwater.This paper improves and consummates the mode to suitable for linear and nonlinear numerical simulation, and then present method to calculate undulation situation and wave pressure of perforated caisson breakwater. Though compare numerical calculate with physical experiment, the mode has good precision for simple perforated caisson breakwater numerical simulation, may apply in its wave-damping effectiveness computation and research.