ABSTRACT

Because the flow direction of the water above and below the interface of internal wave is opposite, internal wave has a strong shear effect on ocean structures. A dynamic model of internal wave acting on deep water steel catenary riser (DSCR) is built. The global dynamic responses of gas riser and oil riser under the same action of internal wave are both obtained through numerical calculation, and the dynamic response laws of some specified positions are also studied. Then, the maximum value of dynamic response in a certain period of time and its location on the riser is found. At last, the response characteristic of DSCR induced by internal wave is studied in detail when the heave amplitude of floating platform is constant, but the heave frequency changes continuously as well as that the heave frequency is constant, but the heave amplitude changes continuously by some dynamic model experiments.

摘要

由于内波界面上下水流方向相反，内波对海洋结构具有很强的剪切作用。建立了内波作用于深水钢悬链线立管（DSCR）的动力学模型。通过数值计算得到了同一内波作用下的气立管和油立管的整体动力响应，并研究了某些特定位置的动力响应规律。然后求出一定时间段内动态响应的最大值及其在立管上的位置。最后详细研究了浮式平台升沉幅值恒定、升沉频率连续变化且升沉频率恒定时内波诱导的DSCR的响应特性，