吴振豪, 陈长海, 程远胜. 舱室内爆多毁伤元载荷联合作用高效数值仿真方法对比分析[J]. 中国舰船研究. DOI: 10.19693/j.issn.1673-3185.03723.
引用本文: 吴振豪, 陈长海, 程远胜. 舱室内爆多毁伤元载荷联合作用高效数值仿真方法对比分析[J]. 中国舰船研究. DOI: 10.19693/j.issn.1673-3185.03723.
WU Z H, CHEN C H, CHENG Y S. Comparative analysis of high-efficiency numerical simulation methods for combined effects of multiple damage loads in cabin internal explosions[J]. Chinese Journal of Ship Research(in Chinese). DOI: 10.19693/j.issn.1673-3185.03723.
Citation: WU Z H, CHEN C H, CHENG Y S. Comparative analysis of high-efficiency numerical simulation methods for combined effects of multiple damage loads in cabin internal explosions[J]. Chinese Journal of Ship Research(in Chinese). DOI: 10.19693/j.issn.1673-3185.03723.

舱室内爆多毁伤元载荷联合作用高效数值仿真方法对比分析

Comparative analysis of high-efficiency numerical simulation methods for combined effects of multiple damage loads in cabin internal explosions

  • 摘要:
    目的 旨在解决舱室内爆多毁伤元载荷联合作用仿真计算问题并兼顾计算精度和效率,提出新的接触−耦合重启动(接触重启法)和载荷等效加载(等效加载法)这两种高效数值仿真方法。
    方法 接触重启法刚开始不启用破片与结构的接触设置,待破片快侵彻结构时启动;等效加载法不考虑炸药爆轰的流固耦合过程,直接根据经验公式进行载荷的简化加载;考虑裸药内爆和炸药端部贴预制破片空爆这两种情情况,验证所提两种高效仿真方法的合理性和准确性。与常规的全时域接触−耦合仿真方法(全时域法)进行对比,讨论所提方法对舱室内爆多毁伤元载荷联合作用仿真的可行性和优越性。
    结果 结果表明:相较于全时域法,在对近距爆炸多毁伤元联合作用的仿真计算中,接触重启法不仅能保证计算精度,还可提升计算效率;等效加载法能避免远距爆炸或大尺寸舱室内爆多毁伤元载荷联合作用下网格尺寸不匹配和网格数量过多等问题,极大地节省了计算资源,并兼顾了计算精度。
    结论 研究可为大尺寸舱室内爆多毁伤元载荷联合作用数值仿真提供合理可行的方法。

     

    Abstract:
    Objective In order to solve the problem related to numerical simulation methods of combined effects of multi-damage loads for cabin internal explosions by considering both the accuracy and efficiency of simulations, two high-efficiency simulation methods, i.e., contact-coupling restart (CCR) and load equivalent loading (LEL) methods, were proposed in this paper.
    Methods The contact setting between structures and fragments was inactive, and was activated just before the fragments penetrating the structures in CCR method. The LEL method directly performed simplified loading of loads based on empirical equations, and neglected the fluid-structure coupling process of charge detonation. The rationality and accuracy of the two proposed high-efficiency simulation methods were verified by bare-charge internal explosions and air blasts of charges with prefabricated fragments. Through comparisons with conventional whole-time contact-coupling simulation (WCC) method. the feasibility and superiority of two proposed methods for the numerical simulation of combined effects of multi-damage loads for cabin internal explosions were discussed.
    Results The results show that compared with the WCC, the CCR can not only ensure the simulation accuracy, but also greatly improve the simulation efficiency in the case of simulating the combined effect of multiple damage loads for close-range air blasts. The LEL can avoid the grid-size mismatching problems and excessive number of grids in the case of combined effects of multiple damage loads for far-distance air blasts or large-size cabin internal explosions. Meanwhile, the LEL can tremendously save simulation resources and hugely enhance the simulation accuracy.
    Conclusion The study in this paper provides a reasonable and feasible method for numerical simulations of the combined effects of multiple damage loads for cabin internal explosions.

     

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