Research On Simulation Technology Of Subsea Structures Through Splash Zone

Due to the different forms of underwater structures and water inflow,the water entering process of structures is extremely complicated,and the study of the lowering structures in the project through the splash zone is more urgent.Based on the actual project,the components of the specific underwater structure are analyzed,and three structural unit models of wedge,flat and cylindrical are obtained.FLUENT is used to simulate the gas-liquid two-phase flow and the maximum impact pressure of the three structural unit models into the water process by the fluid volume function multiphase flow model(VOF)and the dynamic mesh technique.Combined with the analysis results,the sensitivity analysis of the decentralization of the tree based on the actual environmental parameters by the marine engineering software OrcaFlex is carried out,and the climate window of the tree with engineering significance is obtained.In the process of entering the water,the shape of the incoming water,the speed of water entering,the area of water entering,and the spacing of the model have an effect on the pressure peak.In terms of water inlet shape,the peak pressure of the wedge body is the smallest,the cylinder is second,and the flat bottom is the largest;the square of the water inlet velocity is approximately proportional to the pressure peak;the size of the water inlet area is approximately proportional to the pressure peak;the model spacing is for the flat bottom body.Basically,there is no influence.For a cylinder,the smaller the spacing,the larger the pressure peak.When the spacing is larger,the effect is smaller,until there is no effect.Through the splash zone phase,the wave height of the wave is the strongest for the tree due to the sensitivity analysis of the environmental parameters,affecting the horizontal offset and the cable load,which may cause the tree to turn over and the cable to break;the flow rate is at this stage.Only affecting the horizontal offset,the overall effect is not obvious;combined with the safe operating standards,a climate window with engineering reference significance has been developed.