水流作用下筏式养殖设施动力响应的数值模拟

Numerical simulation of dynamic response of long-line culture facility to the current

利用有限单元法建立了水流作用下筏式养殖设施动力响应的数学计算模型,通过数值求解对浮标和吊笼结构的最大位移以及锚绳受力进行分析。计算机模拟结果表明,筏绳在水流作用下产生明显的变形,其形态变化与实际基本相符。当流向一定时,浮标和吊笼的最大位移值以及左右两侧的锚绳受力均随流速的增加而增大。其中,浮标最大位移值7.6m,吊笼最大位移值9.6m。当流速一定时,浮标和吊笼的最大位移值与右侧锚绳受力随着来流角度的增加而增大。左侧锚绳力受来流方向变化影响不明显,其最大值为3 780N。

Long-line culture facility in the sea may move and deform under the effect of current. In order to keep the stability and safety of the facility, it is necessary to carry out the dynamic analysis of the whole structure. Herein, a numerical model based on finite element method was developed to reveal the dynamic response of long-line culture facility to the current. The maximum displacement of float and hanging cage and maximum mooring line force were cal- culated and analyzed. The simulation results showed that the float rope deformed obviously un- der the effect of current, and the change of shape corresponded with the practical condition. Furthermore, the maximum displacement of float and hanging cage and the both mooring line force increased with the increase of the current velocity under the same flow direction. The maximum value of displacement of float and hanging cage were 7.6 m and 9.6 m, respectively. The maximum displacement of float and hanging cage and the right mooring line force increased with the increase of the current angle under the same current velocity. But the left mooring line force changed slightly under the different current direction, with the maximum value of 3 780N.