| The study of floating breakwaters can be a good solution to the problems of harbor,floating dock,floating trestle and island.The advantages are low cost,environmental friendliness,easy installation and movement,and effective elimination.Wave properties and low seabed geological requirements,and many other advantages.Therefore,more and more attention has been paid to the study of floating breakwaters.The research on three-dimensional floating breakwaters is an urgent need for development.However,most researches have focused on the research of two-dimensional breakwaters.In this paper,the method of analytic and numerical simulation is used to study the wave field around the three-dimensional breakwaters.The analytical method is fast and the numerical method is not restricted by the breakwater structure,and the breakwater structure is optimized by studying the wave field of the breakwater.According to the geometrical model,the flow field around the breakwater is divided into different fluid domains.Based on the boundary condition of each fluid domain,the characteristic function of each subarea is used to expand and the adjacent fluid domain(Arc type,V type),we can get the expression of the velocity potential of the surrounding flow field.The unknown number in the formula can be calculated by the boundary condition of the object surface and the control surface.After determining the velocity potential of each fluid domain,the wave height of each point in the fluid domain can be known by the wave equation,and the transmission coefficient and reflection coefficient of the breakwater can be obtained.Secondly,by changing the wavelength of the incident wave and the different central angle of the breakwater,the relationship between the contours of the waves around the breakwater and the change of parameters is obtained.By comparing the analytic solution with the wave diffraction field of the box-type breakwater simulated by the AQWA software,the relationship between the radius of the circular arc and the radius of the arc-shaped breakwater can be obtained.Inverted Π-type floating breakwater from the upper and lower floating body composition,namely the box-type floating body and the bottom of the plate.The inverted Π-type floating breakwaters have a good performance of eliminating wave,and its two parts have different ways of eliminating waves.The box-type floating body mainly attenuates the incident waves by the wave reflection.The bottom of the sheet mainly uses the damaging water particles to eliminate the wave of.The dynamic response of the model and the corresponding parameters of the mooring system are calculated in the time domain by using the hydrodynamic analysis software ANSYS-AQWA to calculate the transmission coefficient of the inverted Π-type floating breakwater in the frequency domain.In this paper,the inverted Π type floating breakwater model test is carried out.Under regular wave condition,the response,transmission coefficient,reflection coefficient and mooring tension of the model are obtained under different wave height and period.The numerical results of the floating breakwater are compared with the results of the model experiment,and the basic data of the wave-break performance of the inverted-type floating breakwaters are obtained,which is effective for the practice of the floating breakwaters. |
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