Numerical Simulation Of Submarine-buoy Floating System Dynamics

With the development of economy and the increasing demand for resources,the exploitation and exploration of the ocean have become more and more important factors for national development.Ocean engineering equipment is indispensable in the development of ocean exploration,most of the equipment needs to work in a certain area,such as floating production storage and offloading(FPSO),submarine-buoy detection system,deep-sea aquaculture cage,etc.This kind of equipment is affected by the current in the ocean to produce complex motion,which affects its stable operation,so it is necessary to study the dynamics of this kind of equipment.In this paper,the submarine-buoy floating system is analyzed and calculated.In the process of studying the dynamics of submarine-type underwater suspension system,a submarine-type system model with the lower part divided into slender flexible cylinder and the upper part divided into two free cylinders is firstly established.Secondly,the large eddy simulation method is used to calculate the cylinder model with two free ends,the flow characteristics and flow mechanism around the cylinder are analyzed,the stress characteristics are summarized,and the causes of the stress characteristics are analyzed.In addition,three different cylinder shapes are selected to study the drag reduction of the cylinder with two free ends by changing the cylinder shape.And get the cylinder shape with good drag reduction effect.Thirdly,the large eddy simulation method is also used to calculate the submerged buoy system model,analyze the flow characteristics and stress characteristics around the system,and carry out research on its related mechanism.Based on the two free ends cylinder shape with good drag reduction,the submerged buoy system model is established,and the drag reduction effect in the submerged buoy system model is analyzed.Finally,through the calculation of the slender flexible cylinder,the method of directly loading the fluid force on the cylinder structure to solve the structural response is determined.The calculated fluid force is loaded into the submerged buoy system model to solve the response,and the response characteristics are studied.And the vibration suppression effect of the drag reduction submerged buoy system model is also studied.In this paper,the numerical simulation method is used to analyze the dynamics of the submerged buoy system model.The stress of the whole system and the flow mechanism around it are analyzed.On this basis,the structural response characteristics of the model and the system’s resistance and vibration reduction are studied.This paper provides a useful reference for improving the anti-interference ability of mooring structure,the related research of multi-point mooring system and the motion control of mooring structure.