船舶与海洋平台结构冰载荷的高性能扩展多面体离散元方法

刘璐; 尹振宇; 季顺迎

doi:10.6052/0459-1879-19-250

船舶与海洋平台结构冰载荷的高性能扩展多面体离散元方法

刘璐^*,,
尹振宇^†,
季顺迎^*2),

^*大连理工大学工业装备结构分析国家重点实验室,大连 116024
^†香港理工大学土木与环境工程系,中国香港 999077

基金项目: 1) 国家重点研发计划重点专项(2017YFE0111400);国家重点研发计划重点专项(2016YFC1401505);国家自然科学基金项目资助(51639004);国家自然科学基金项目资助(41576179)

详细信息

通讯作者:
季顺迎

中图分类号: O343.3,U66
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出版历程
- 收稿日期: 2019-08-30
- 刊出日期: 2019-11-17

HIGH-PERFORMANCE DILATED POLYHEDRAL BASED DEM FOR ICE LOADS ON SHIP AND OFFSHORE PLATFORM STRUCTURES

Liu Lu^*,,
Yin Zhenyu^†,
Ji Shunying^*2),

^*State Key Laboratory of Structural Analysis of Industrial Equipment, Dalian University of Technology,Dalian 116024, China
^†Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University,Hong Kong 999077, China

摘要

摘要: 船舶与海洋平台结构的冰载荷是寒区海洋工程结构物设计中的关键参数,而离散元方法是有效计算结构冰载荷的重要手段. 本文采用基于闵可夫斯基和原理的扩展多面体离散元方法模拟船舶与海洋平台结构的相互作用过程. 其中,构造扩展多面体的近似包络函数并建立了基于优化模型的快速接触搜索算法;考虑单元间粘结作用的刚度软化过程建标识码元间的粘结-破碎模型. 同时,发展了 CPU-GPU 协同异构环境下的高性能并行算法. 为分析海冰与海洋结构作用中的冰载荷,采用ISO标准验证了扩展多面体离散元分析结构冰载荷的准确性. 采用离散元方法计算了船舶结构的冰载荷,研究了船舶结构表明的线载荷分布特点,并采用船舶结构冰阻力经验公式验证了计算结果的合理性. 采用离散元方法计算了平整冰区与多桩腿平台结构的相互作用,分析各桩腿上的冰载荷特点. 针对碎冰区的海冰管理过程,采用离散元方法分析了船舶结构绕行过程中的船舶和海洋平台结构冰载荷. 本文方法可有效应用于海洋结构冰载荷分析,能为极地船舶与海洋平台结构的设计和安全运行提供科学的分析手段.
- 扩展多面体 /
- 离散元 /
- 船舶与海洋平台结构 /
- 冰载荷 /
- 高性能算法
Abstract: The ice loads on ship and offshore platform structures is the key factor in structure design for cold regions. The discrete element method (DEM) is an important approach to determine the ice load on structures. According to the Minkowski sum theory, the dilated polyhedra based DEM is employed to simulate the interaction between sea ice and ship and offshore platform structures in this paper. In the dilated polyhedra based DEM, the enveloped function of the dilated polyhedron is generated to establish the fast contact detection algorithm based on the optimization model. Meanwhile, the bond-break model between elements is established by considering the stiffness softening process between bonded elements. Accordingly, the high-performance algorithm based on CPU-GPU cooperative-heterogeneous environment is developed. The ISO standard is employed to validate the ice load determined by the dilated polyhedra based DEM for better engineering applications of the interaction between sea ice and marine structures. The ice load on ship hull is calculated by the proposed method while the line load distribution on ship hull is studied. The ice resistance of ship hull is compared with the result by Lindqvist empirical formula to validate the accuracy of DEM simulations. The interaction between level ice and multi-leg platform is simulated while the ice load on each leg is analyzed. For the ice management in broken ice regions, the ice load on ship and offshore structures is simulated when the ship navigates around the offshore platform in circle. The proposed method can be effectively applied in the analysis of ice load on marine structures, and can provide a scientific approach for the design and safety operation of ship and offshore structures.
- dilated polyhedron /
- discrete element method /
- ship and offshore platform /
- ice load /
- high-performance algorithm

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