Numerical Simulation Of Hydrodynamic Behavior Of Fishing Buoy Under Wave Action

Currently, due to frequent human activities, environmental situation is not optimistic and aquaculture pollution problems are serious in the sea, resulting in a decline in output of aquatic products. When the offshore fishery resources is decreasing and environment situation is worse, aquaculture from offshore sea to deep sea is a kind of inevitable choice to seek better aquaculture environment. Deep sea have less environmental pollution, rich nutrition and strong ability of decontamination. Deep sea aquaculture technology can not only solve the current situation of aquatic products in short supply and also can avoid the excessive pollution of the environment. At present, the deep technology has got great development and many scholars have been focused on the safety of the cages under complex sea condition. In this paper, we study hydrodynamic characteristics of fishing buoy by the physical model test and numerical simulation method, in order to provide design reference for the development of deep-water cage.In this dissertation, dynamic response of fishing buoy under wave action are analyzed by the method of numerical simulation and physical model test. First of all, a numerical model of fishing buoy is developed, based on lumped mass method and rigid body kinematics. Based on the numerical model, an computer-simulation system for fishing buoy is set up. The results of the numerical simulation were compared with the results in physical experiment. Finally, when the volume and quality are close, hydrodynamic behavior of fishing buoy under wave action are analyzed and the differences of two kinds of buoy are discussed.This paper contains five chapters altogether. In the first chapter, the back ground and the significance of this dissertation are introduced, and the relative researches and the advance are also presented. In the second chapter, the basic theory of two different shapes of fishing buoy are introduced and the numerical simulation methods of fishing buoy are analyzed. In the third chapter, physical model experiment and the means of data collection of spherical buoy are introduced. Then the results of the numerical simulation were compared with the results in physical experiment. At the same time, the influences of wave height and periodic variation on the movement and force of spherical buoy are compared and discussed. In the fourth chapter, the article introduces the method of cylindrical buoy physical model test, then the results of the numerical simulation were compared with the results in physical experiment, hydrodynamic behavior of cylindrical buoy under wave action are analyzed from the cylindrical buoy range of motion, the anchor rope force and angle of three aspects. In the Fifth chapter, when the volume and quality are close, hydrodynamic behavior of two different shape fishing buoys are analyzed and the differences of two kinds of buoy are discussed, by the physical model test results and the numerical simulation results. At the end of the dissertation, the achievements of this study are summarized, and the further study and prospects are given.