Determination method of mesh size for numerical simulation of blast load in near-ground detonation  

作　　者：Doudou Si Zuanfeng Pan Haipeng Zhang 

机构地区：[1]College of Civil Engineering,Tongji University,Shanghai 200092,China [2]State Key Lab of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China

出　　处：《Defence Technology（防务技术）》2024年第8期111-125,共15页Defence Technology

基　　金：the funding supports of the National Key Research and Development Plan,China(Grant No.2022YFC3801800);National Natural Science Foundation of China(Grant Nos.52038010 and 52078368)。

摘　　要：In order to improve the overall resilience of the urban infrastructures, it is required to conduct blast resistant design for important building structures in the city. For complex terrain in the city, it is recommended to determine the blast load on the structures via numerical simulation. Since the mesh size of the numerical model highly depends on the explosion scenario, there is no generally applicable approach for the mesh size selection. An efficient method to determine the mesh size of the numerical model of near-ground detonation based on explosion scenarios is proposed in this study. The effect of mesh size on the propagation of blast wave under different explosive weights was studied, and the correlations between the mesh size effect and the charge weight or the scaled distance was described. Based on the principle of the finite element method and Hopkinson-Cranz scaling law, a mesh size measurement unit related to the explosive weight was proposed as the criterion for determining the mesh size in the numerical simulation. Finally, the applicability of the method proposed in this paper was verified by comparing the results from numerical simulation and the explosion tests and was verified in AUTODYN.

关 键 词：Blast load Mesh size effect Numerical simulation Scaled mesh size VERIFICATION 

分 类 号：TU352.13[建筑科学—结构工程] O383.2[理学—流体力学]