Numerical Simulation of Flight and Impact of Windborne Debris
Numerical Simulation of Flight and Impact of Windborne Debris
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风载碎片飞行和撞击的数值模拟
DOI：
10.1093/oxfordhb/9780190670252.013.12
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Takashi Nomura
中科院分区：
文献类型：
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作者：
Kanta Takahashi;Kazuyuki Nakahata;Takashi Nomura
介绍了模拟风载碎片飞行和撞击的数值方法。基于ALE有限元流场分析方法，将飞行器气动特性问题转化为流固耦合问题，以处理任意形状的飞行器以及气动力的动态变化。对于飞行模拟，计算域随飞行物体移动，因为飞行距离通常比碎片的大小长得多。对于数值碰撞过程，通过迭代确定碰撞力的大小，使得碰撞后球体的速度收敛到零。此外，为了抑制非物理的逐步压力振荡，在冲击时的时间步长被细分为一组多个短的时间步长与平滑的冲击力函数。刚性球的几个数值例子表明，这些方法的令人满意的功能。
Numerical methods to simulate flight and impact of windborne debris are described. The problems are treated as fluid–structure interaction problems based on the ALE finite element flow analysis in order to deal with arbitrary shape of flying objects as well as dynamical change of aerodynamic forces. For the flight simulation, the computational domain travels with the flying object because usually the fight distance is much longer than the size of the debris. For the numerical impact process, the magnitude of the impact force is determined by iteration so that the velocity of the sphere after impact converges to zero. Furthermore, in order to suppress unphysical step-by-step pressure oscillation, the time step at the impact is subdivided into a set of multiple short time steps with a smooth impact force function. Several numerical examples of a rigid sphere show satisfactory features of these methods.