【摘要】 海水—浮体耦合作用显著影响浮体动态反应。本文以HDPE(high-density Polyethylene)双浮筒近海养殖网箱中的浮体节段为研究对象，采用双向交叉耦合算法模拟海水与浮体之间的流—固耦合作用（fluid-structure interaction,FSI）效应。考虑网箱浮体的双浮筒结构形式及其系泊系统，建立浮体节段的三维精细有限元模型；调查网箱在其运行区域可能遇到的多种海况，并设计数值波浪水槽，模拟HDPE双浮筒海上养殖网箱浮体节段的动态反应。数值模拟结果表明：在波流荷载下，浮体节段经历刚体平移、旋转和扭转变形，且扭转变形与旋转趋势同步；浮体节段与连接器的交界处是浮体结构设计的薄弱部分；与仅考虑波—流效应的计算结果相比，海水与浮体节段之间的FSI效应会引发浮体节段的高频运动；内海或湾内的浮体能够承受10年一遇台风引发的极端波流作用。更多还原

【Abstract】 Seawater-floater interaction significantly impacts floater dynamic response. Taking the floater segment in an HDPE(high-density Polyethylene) double-pontoon nearshore fishing net cage as the research object, a two-way cross-coupling algorithm was employed to simulate the fluid-structure interaction(FSI) effects between seawater and the floater. Considering the double-pontoon structural form of the net cage floater and its mooring system, a threedimensional refined finite element model of the floater segment was established. Various sea conditions that the net cage might encounter in its operational area were investigated, and a numerical wave tank was designed to simulate the dynamic response of the floater segment in the HDPE double-pontoon nearshore fishing net cage. The numerical simulation results show that under wave-current loading, the floater segment undergoes rigid translation, rotation, and torsional deformation, with the torsional deformation synchronizing with the rotation trend. The intersection between the floater segment and connectors is a weak part in the floater structure design. Compared with calculation results that only consider wave-current effects, the FSI effects between seawater and the floater segment induce high-frequency motion of the floater segment, with significant amplitude and resulting structural internal forces. Floater in inner seas or bays can withstand extreme wave-current actions caused by a once-in-ten-year typhoon.更多还原