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基于S-ALE方法的圆柱体垂直出水破冰研究

RESEARCH ON VERTICAL MOVEMENT OF CYLINDRICAL STRUCTURE OUT OF WATER AND BREAKING THROUGH ICE LAYER BASED ON S-ALE METHOD

  • 摘要: 以往针对结构物垂直贯穿冰层破裂的研究多不考虑水的作用, 与实际应用场景不符. 本文应用 LS-DYNA 有限元软件建立了基于结构化-任意拉格朗日欧拉(S-ALE)流固耦合方法及罚函数接触算法的冰−水−结构物耦合作用数值模拟方法. 采用欧拉算法描述空气域和水域, 采用拉格朗日算法描述圆柱体结构和冰层结构, 使用弹塑性应变率模型表征冰材料力学性质. 自主搭建了圆柱体垂直贯穿冰层试验台架, 验证了有限元方法计算结构物−冰层相互作用问题的可行性. 通过模拟圆柱体垂直出水破冰过程, 并与无水环境下圆柱体垂直贯穿冰层破裂过程进行对比. 结果表明: 有水环境下结构物−冰层间作用存在“水垫效应”; 冰层突破载荷极值大小与有、无水环境无显著变化; 有水环境下的结构物突破冰层冰载荷持续时间明显长于无水环境下持续时间; 有水环境冰层弹性变形阶段更长, 且有水环境冰层挠度变化大于无水环境下的挠度变化. 本文研究成果为极地冰区环境下结构物垂直出水破冰的结构强度计算及优化设计提供了研究基础.

     

    Abstract: The previous studies on the vertical penetration of structures through level ice mostly did not consider the water action, which was inconsistent with the actual application scenarios. In this paper, a numerical simulation method of ice-water-structure interaction based on structured-arbitrary Lagrange Euler (S-ALE) fluid-structure coupling method and penalty function contact algorithm is established by using LS-DYNA finite element software. Eulerian algorithm is used to describe air and water areas, Lagrangian algorithm is used to describe cylinder structure and level ice structure, and elastic-plastic strain rate model is used to characterize the mechanical properties of ice materials. Self-built test bench for vertical penetration of cylinder through level ice verified the feasibility of finite element method to calculate the interaction between structure and level ice problem. By simulating the ice-breaking process of cylinder vertical upward water breakthrough, it is compared with the ice-breaking process of cylinder vertical penetration in waterless environment. The results show that there is "water cushion effect" in the interaction between structure and level ice in water environment; The extreme value of ice breakthrough load has no significant change with the presence or absence of water; The duration of ice load when the structure breaks through level ice in water environment is obviously longer than that in waterless environment.The elastic deformation stage of level ice in water environment is longer, and the deflection change of level ice is greater than that in waterless environment. The research results of this paper provide a research basis for strength calculation and optimization design of ice-breaking structure with vertical vertical upward water breakthrough in polar ice area.

     

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