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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