دانلود رایگان مقاله شبیه سازی عددی دگردیسی و نیروهای یک ماهی شناور

ABSTRACT

The dynamic behavior of a fish cage collar in waves was investigated using a numerical model based on the finite element method. The floating collar and mooring system were divided into a series of line segments modeled by straight massless model segments with a node at each end. To verify the validity of the numerical model, research data from other authors were cited and compared with the simulated results, the comparison of results showed a good agreement. The numerical model was then applied to a dynamic simulation of a floating cage collar in waves to analyze its elastic deformation and mooring line tension. The simulated results indicated that the greatest deformation of the collar taken place in the position of the mooring line connection point when incident waves were in the same direction. An increase in the length of mooring line would help to decrease the mooring line tension of the collar. Furthermore, the effects of collar dimension, including collar circumference, pipe diameter in crosssection, and pipe thickness, on the dynamic behavior of the floating collar were discussed. The results of this study provided a better understanding of the dynamic behavior of the fish cage collar.

5. Conclusions

This paper presents a numerical model based on the finite element method, for modeling the dynamic behavior of a fish cage collar in waves. The validity of the numerical model is verified by comparing the results with the data from Hao (2008) and Li et al. (2013). Using the numerical model, the elastic deformation and mooring line tension of a floating fish cage collar are analyzed and discussed in detail. Several primary conclusions are given as follows:(1) The numerical model presented in this paper is suitable to simulate the dynamic behavior of a fish cage collar in waves. (2) Deformation occurs to the floating collar in waves. The greatest deformation takes place in the position of the mooring line connection point when the incident waves are in the same direction. (3) An increase in the length of mooring line helps to decrease mooring line tension. (4) The effect of collar circumference on the maximum strain ofthe floating collar is small, but with increasing collar circumference the maximum mooring line tension decreases. (5) With increasing cross-sectional diameter or thickness of pipe, the maximum strain of the floating collar becomes smaller and the maximum mooring line tension becomes larger.