波浪作用下单体网格式浮架受力的数值模拟

Numerical Analysis of the Mooring Line Force of Floating system with Gridding Mooring System

模型试验表明重力式网箱在波浪作用下，单纯浮架的受力贡献比例较大。本文运用波浪理论，通过建立浮架、锚绳及浮子的运动方程，采用五阶龙格-库塔进行数值求解，得到了单体网格式锚碇单纯浮架的数值计算模式。将计算模型简化为四点锚碇，并将计算结果与实验结果进行了比较，二者符合程度较好。在此基础上，比较了单体网格式锚碇与四点锚碇单纯浮架的受力，结果表明网格式锚碇方式浮架受力较小。

The results of model tests indicate that floating collar is the major structure on which the most wave forces on the gravity cage is subjected. In this paper, numerical analysis has been carried out to calculate the wave force action on the floating collar of sea cage with gridding mooring system in waves only. Based on lumped mass method and linear wave theory, the motion equations of floating system, net system, mooring system and floaters are set up, and then the Runge-Kutta-Verner fifth-order and sixth-order method is applied to solve the equations. In order to validate the numerical model in this paper, the simulated results are compared with the experimental ones. The results by the numerical simulation all agree well with the experimental data. Based on the validation of numerical model, the wave forces acting on the floating collar with gridding mooting and four lines mooring are compared.