Numerical Investigation Of The Solitary Wave Interacting With Submerged Plate By MPS-FEM Method

Since the 21 st century,the overexploitation and depletion of terrestrial natural resources has become a huge challenge human beings face.The ocean,containing abundant oil and gas resources,is becoming the focus of human development and utilization.The stability and safety of marine engineering equipment under marine environment is a topic which engineers are concerned with.The wave interacting with the underwater part of the semi-submerged offshore platform as well as the very large floating structure(VLFS)can be reducible to the interaction between the wave and submerged plate.The breakwater and artificial reef applied to attenuate wave energy to protect coastline and offshore structures can also be simplified to a submerged horizontal plate.This paper studies the interaction between solitary waves and plates,focuses on the interaction mechanism between solitary waves and plates,and provides guidance for engineering analysis of wave-object interactions.This paper adopts the MPSFEM-SJTU fluid-structure coupling solver developed based on Move Particles Semi-implicit(MPS)and Finite Element Method(FEM)to investigate the solitary wave interacting with submerged plate.The interaction between the solitary wave and the rigid submerged plate is compared with that between the solitary wave and flexible plate.The solitary wave amplitude and other factors are analyzed.In this paper,we first perform solitary wave verification.The solver was used to generate two-dimensional and three-dimensional solitary waves,and then the wave height and wave form of the numerical results were compared with theoretical values,which verified the accuracy of the solver's wavemaking module.The verification of the wave formation laid the foundation for the interaction between the solitary wave and the immersion plate.Then,the interaction between the solitary wave and the vertical submerged plate is simulated.In the simulation,the interaction between 2D solitary wave and rigid vertical plate is first analyzed.Then influence of the flexibility of the vertical plate on the interaction between the solitary and plate is investigated.The interaction between the 3D solitary wave and the vertical submerged plate is also studied.The results show that after the solitary wave passes through the vertical plate,the waveform and wave height will change,and at the same time,the breaking phenomenon will occur at the tail.When the elastic deformation of the plate is large,the solitary wave will not break at the tail,but when the elastic modulus of the plate increases,the breaking phenomenon will occur again.The interaction between three-dimensional solitary waves and vertical plates also have different phenomena.Finally,the paper studied the solitary wave interacting with horizontal submerged plate.In the study,the interaction between the solitary wave and horizontal rigid plate is simulated first.The influence of wave amplitude and plate submerged depth on the interaction between the solitary wave and submerged plate is analyzed.Then,the 2D solitary wave interacting with flexible horizontal submerged plate is simulated to investigate the influence of plate flexibility.The 3D solitary wave interacting with the horizontal immersion plate was also analyzed to study 3D effect of the plate.The results indicate that different solitary wave heights,immersion depths of the plate and the plate elasticity have different effects on the interaction of the solitary wave with the horizontal plate.At the same time,the interaction between the 3D solitary wave and the horizontal plate is also different from the 2D case.