| Abstract: | The breakage of anchor chain for buoys due to wear will lead to the loss of buoy, the study of buoy mooring systems has important implications for the design of chains to extend service life of buoys. In order to solve the problem of insufficient accuracy of the method for calculating the mooring force and the inconsistency between the simplified mechanics model and the actual shape of an anchor chain, a three-dimensional numerical wind-wave coupling flow field was established by using VOF interface capture method, and a numerical simulation calculation of a rotomolding buoy and its chain was carried out based on STAR-CCM+. By establishing physical model of double link buoy chain, the mooring force of anchor chain is obtained by solving the drag force of buoy in wind and wave and the stress loss at the connection between buoy and chain. The results show that the stress loss on the chain increases as the wind and wave going stronger, the losses of the buoy under level 2, 3 and 4 sea conditions are 17.1%, 36.6% and 55.8% respectively. The mooring force on the double chain links of the chain is not equal, the main link of the chain bears more than 90% of the mooring force under level 2, 3 sea conditions, and the mooring force of the secondary link of the chain increases with the increase of the total mooring force, it is concluded
that the specification of the single chain should be same as the double chain. |
