Coupling Hydrodynamic Analysis Of Floating Breakwater

Breakwater is a common coastal engineering structure. Compared with traditional breakwaters, floating breakwaters have many advantages, such as easy to be constructed, low cost and noticeable flexibility and so on. But the most important is that floating breakwaters have low effect on ocean environment and do not prevent sea water exchange. Therefore, it will not cause ocean pollution. In addition, floating breakwater has a good performance on wave attenuation, especially for waves with shorter period, so it can replace traditional breakwater in some cases. In order to ensure ocean floating structures in the fast-change environment of South China Sea work stably and safely and meet the requirement of environment protection, floating breakwater is a better choice and has a great of practical meanings.This paper based on the conclusion of Floating breakwater unit configuration optimization model test founded by MIIT, and cylindrical floating breakwater with mesh cages and balls had been optimized as the experimental model. On this basis, this paper conducted a test to research the hydrodynamic performance and wave attenuation performance of the floating breakwater system. The main works of this paper are as follows:1. Optimizing the configuration of the cylindrical floating breakwater with mesh cages and balls and its detailed parameters of every part has also been listed. In addition, a mooring system has been designed too. By using hydrodynamic calculation software ANSYS-AQWA, we established the numerical model of the floating system and calculate its motion responses and mooring forces within extreme conditions of South China Sea in time domain. We compared the results with standards to prove feasibility.2. Due to there are massive flexible structures among the floating system are not be considered for the numerical calculation and transmission coefficient also not can be get by it, therefore, a 3D experiment is necessary. According to similarity theory, model and mooring system parameters are conformed. In addition, we designed test scheme based on environmental parameters of South China Sea.3. Through data analysis, we study the effect of wave height, wave period, wave obliquity and distance on the transmission coefficient, reflection coefficient and dissipation coefficient of floating breakwater system.4. Through data analysis, we study the effect of wave height, wave period and wave obliquity on the motion responses of floating breakwater system.5. Through data analysis, we study the effect of wave height, wave period and wave obliquity on the mooring forces of floating breakwater system.The results show that wave period has great effect on the wave attenuation performance of floating breakwater system while the effect of wave height and wave obliquity on it is not strong. FB system has better effect on wave attenuation for nearby location than farther location. However, wave height and period have a great influence on motion response while mooring forces mainly affected by wave obliquity.