Research On Hydrodynamic Analysis Method Of Coupling Wave And Multi-channel Floating Breakwater Based On SPH

Floating breakwaters have been widely used as an engineering structure to protect offshore equipment and island beaches from wave erosion.Although many scholars focus on the study of floating breakwaters,there are still no effective solutions to the characteristics of poor long-wavelength wave-eliminating effects.The application of mature commercial finite element software for numerical simulation has certain reliability.However,due to the finite element method,the accuracy of solving the wave smashing phenomenon under viscous conditions is insufficient,which leads to some deviation between the research results and the actual engineering conditions.In view of the above two shortcomings in the current research on floating breakwaters,the main research contents of this paper are as follows:1.Summarize the domestic and international research results of floating breakwaters in recent years,summarize and analyze the current research priorities and inadequacies,and propose the research content of this paper.2.The smooth particle hydrodynamics(SPH)method based on viscous flow theory is used as the solving tool to establish a numerical model.Through the convergence analysis,the parameters affecting the accuracy of the SPH method are optimized and selected in the SPH method.Improvements are made to ensure the reliability of program operations.By adding a pressure wave absorbing layer at the end of the numerical wave trough,the effect of the reflected wave on the numerical simulation results is effectively eliminated.Finally,compared with the theoretical value,verify that the SPH value of the wave sink used in this paper meets the requirements.3.Aiming at the lack of anchor chain force in SPH program,this paper proposes a dynamic anchor chain force calculation method suitable for SPH based on the method of anchor chain force concentration mass method and the particle characteristics of SPH method to realize the floating structure.The anchoring effect of the object.The reliability of the method is verified by comparison with the time chart of the test results.4.Aiming at the unsatisfactory effect of single-channel floating breakwater on long-period wave wave-eliminating,this paper proposes a method of applying two-channel floating breakwater and double-body floating breakwater for wave-eliminating,and numerical simulation under the same working conditions The transmission coefficient,traverse amplitude,sag amplitude and roll response of the two systems were systematically compared,and the relationship between different incident wave height,wave period,floating body spacing and the hydrodynamic performance of the breakwater was obtained.By comparing the transmission coefficient and the motion response amplitude of the two-channel floating breakwater and the double-body floating breakwater under different spacing conditions,the relationship between the floating body spacing and the hydrodynamic performance of the breakwater under different working conditions is obtained.The results show that under long-period wave conditions,the double-body floating breakwater has a more obvious blocking effect on waves,and its transmission coefficient is smaller.This has certain guiding significance for the application of multi-channel floating breakwaters to reduce long-period waves.