Numerical Simulation On Motion Response Of Floating Wharf

The Floating Wharf has a widely using space.It can be arranged both in the offshore and in the open sea.The superstructure of Floating Wharf is various and anchored on the seabed by mooring system.The mooring mode can be divided into single point mooring or multi-point mooring,which can adapt to the complex and changeable marine environment,and the cost is lower than that of fixed wharf.The whole structure of Floating Wharf is mainly affected by the environmental loads such as wind,wave and current and the working loads such as berthing,loading and unloading of ships.The upper structure is stabilized by the mooring system to resist the environmental loads such as wind,wave and current,so as to meet the working requirements of berthing and material transportation.The environmental load is very important for the analysis of the motion and mooring force of the Floating Wharf,which will directly affect the safety of the ship berthing and the operation of the Floating Wharf.In this paper,a Floating Wharf in the South China Sea is taken as an example.Based on the potential flow theory,considering the multi angle environmental load condition under the level 5 sea condition,a three-dimensional model is established,and the frequency domain and time domain hydrodynamic analysis is carried out,and the comparative study of different distributed mooring forms is carried out.For the sake of conservatism,this paper studies the extreme case of wind,wave and current in the same direction to study the maximum response of Floating Wharf.In this paper,the boundary element method is used to calculate the Floating Wharf in frequency domain,and the important parameters such as additional mass,additional damping and wave exciting force are obtained.On the basis of frequency domain,time domain analysis is carried out,and different environmental loads are selected to analyze the mooring system of Floating Wharf.Two types of distributed mooring systems are given according to the engineering cases,and the motion responses of Floating Wharf under the two types of mooring systems are analyzed in time domain.The six degree of freedom motion responses of four groups of Floating Wharf in different directions and the changes of mooring line tension are obtained.Furthermore,the advantages and disadvantages of the two distributed mooring systems in different directions are compared,the influence of environmental loads on the whole mooring system of Floating Wharf is analyzed,and a more reasonable mooring mode is determined.On this basis,the optimal design of the model is carried out to reduce its motion response and mooring line tension amplitude.The simulation results are in line with the actual situation,which can provide some guidance for engineering design.