Finite Element Analysis of Subsea Pipelines Subjected to Underwater Explosion
Finite Element Analysis of Subsea Pipelines Subjected to Underwater Explosion
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DOI：
10.1115/omae2013-10736
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发表时间：
2013-06
期刊：
影响因子：
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通讯作者：
F. V. D. Abeele;P. Verleysen
中科院分区：
文献类型：
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作者：
F. V. D. Abeele;P. Verleysen
第二次世界大战后遗留在港口和海港的水下地雷和爆炸物仍然会对海底管道构成威胁。在意外爆炸的情况下，或者甚至在受控爆炸期间，这种炸药可能对海底管道造成重大损害。为了评估管道在水下爆炸中的安全性，通过有限元分析来预测管道对声压冲击波的瞬态响应，这类问题的特点是管道的结构响应与管道表面与周围海水湿界面上的声压之间存在强耦合。由水下爆炸引起的球形压力波的特征在于非常陡峭的波前，其中在极短的上升时间内达到最大压力。然后，压力在一个明显更长的时间段内呈指数下降。因此，结构行为是由附加质量效应主导的长时间响应的组合（低频），短时间响应，由辐射阻尼控制（高频）和中间时频响应，其中存在附加质量和辐射阻尼效应。建立了海底管道在水下爆炸载荷作用下的瞬态响应有限元模型。声压和结构响应之间的紧密耦合引起了数值挑战，如冲击波的精确公式和表示，声学域的网格要求，以及基于表面的吸收辐射边界的位置。显式动态求解器用于解决这些挑战，并预测暴露于水下爆炸的海底管道的行为。数值计算结果与已发表的实验数据进行了比较，可用于评估爆炸物附近水下管道的安全性。Copyright © 2013 by ASME
Underwater mines and explosives, left in ports and harbours after World War II, can still pose a threat to subsea pipelines. In case of an accidental explosion, or even during controlled detonation, such explosives can cause significant damage to subsea pipelines. To assess the safety of pipelines exposed to an underwater explosion, finite element analyses are performed to predict the transient response of the pipeline to an acoustic pressure shock wave.This type of problem is characterized by a strong coupling between the structural response of the pipe and the acoustic pressure on the wetted interface between the pipe surface and the surrounding seawater. The spherical pressure wave induced by an underwater explosion is characterized by a very steep wave front, where the maximum pressure is attained over an extremely short rise time. The pressure then drops off exponentially over a significantly longer period of time. As a result, the structural behaviour is a combination of a long time response, dominated by an added mass effect (low frequency), a short time response, governed by radiation damping (high frequency), and an intermediate time-frequency response, where both added mass and radiation damping effects are present.In this paper, a finite element model is presented to simulate the transient response of a subsea pipeline subjected to an underwater explosion. The close coupling between acoustic pressure and structural response gives rise to numerical challenges like the accurate formulation and representation of the shock wave, the mesh requirements for the acoustic domain, and the position of the surface based absorbing radiation boundaries. An explicit dynamic solver is used to tackle these challenges, and to predict the behaviour of subsea pipelines exposed to an underwater explosion. The numerical results are compared to published experimental data, and can be used to assess the safety of submerged pipelines in the vicinity of explosives.Copyright © 2013 by ASME