建筑物内爆流固耦合数值分析

Numerical Studies on Solid-fluid Interaction in Building Implosion

采用适合于计算与爆炸冲击载荷相关的结构大变形问题的ALE流固耦合算法,给出了数值分析爆源、爆炸流场和结构动力学响应等问题所采用的控制方程。重点研究了爆炸流场,即冲击波的传播和波系的演化过程,对影响数值计算精度和稳定性的关键因素:网格控制、时步控制以及粘性项因素进行了讨论,并采用非线性动力有限元程序LS-DY-NA,对冲击波流场与结构耦合作用的全过程进行了数值分析。成功地模拟了建筑物在内爆荷载作用下的动态破坏过程,并得到了某框架结构的毁伤破坏范围。

The interaction between the shock wave of high-energy explosives and building structure is a problem of solid-fluid interaction. In this paper, the ALE fluid-coupling algorithm which is suitable for using in calculating the large deformation systems associated with explosive and impact load is used. The numerical analysis equations, which are about explosion sources, explosion flow, structural dynamics response and tracking interface are offered. The dissemination of the shock wave is researched. Grid control, time step and viscous which are the key factors of the numerical accuracy and stability are discussed. A nonlinear dynamic finite element program LS-DYNA is used. The process of shock wave flow coupled with the structure is calculated successfully. A building destruction process and a scope of destruction is offered.