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Modeling and simulation of interactions between blast waves and structures for blast wave mitigation.

机译：爆炸波与减震结构之间相互作用的建模与仿真。

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摘要

Explosions occur in military conflicts as well as in various industrial applications. Air blast waves generated by large explosions move outward with high velocity, pressure and temperature. The blast waves not only incapacitate military and civilian personnel, but also damages buildings, vehicles, and other properties. Hence, there has been extensive research on how to mitigate blast wave effects. Understanding the interactions between blast waves and structures is a very important step in the development of devices for blast wave mitigation. The objective of this dissertation is to explore the complicated physical problem of blast waves impacting structures. The structures comprise flat, V-shaped and cone-shaped structures. The structures can be fixed or free-standing.;It has been recognized that fluid structure interactions (FSI) between a blast wave and a free-standing structure reduces the blast loads exerted on the structure. The dynamic response of a free-standing plate subjected to a blast wave is numerically studied to investigate the effects of FSI in blast wave mitigation. This dissertation develops a 1-D model which includes the blast wave reflection from a free-standing plate, the plate motion and the shock wave induced in the back of the plate. The Euler equations for the flow fields in the front and in the back of the plate are solved using the Van Leer flux vector splitting scheme coupled with the monotone upstream-centered scheme for conservation laws (MUSCL) and Runge-Kutta scheme.;The reflected pressure for normal reflection is larger than that for oblique and Mach stem reflections, which occur when there is an incident angle between the incident shock front and the reflecting surface. Hence, it is expected that reflected pressure decreases when a blast wave impacts a V-shaped or a cone-shaped structure.;A 2-D numerical model of interactions between a blast wave and a V-shaped or a cone-shaped structure is developed. The model simulates the blast wave reflection from a V-shaped or a cone-shaped structure, the movement of the structure and the induced shock wave behind the structure. Elliptic grid generation and coordinate transformation are utilized to solve the flow fields in the irregular physical domain.
机译：爆炸发生在军事冲突以及各种工业应用中。大型爆炸产生的爆炸波以高速度，高压力和高温度向外移动。爆炸波不仅使军事和文职人员丧失能力，而且还破坏了建筑物，车辆和其他财产。因此，对如何减轻爆炸波影响进行了广泛的研究。理解爆炸波与结构之间的相互作用是开发爆炸波缓解设备的非常重要的一步。本文的目的是探讨冲击波冲击结构的复杂物理问题。该结构包括平坦的，V形的和锥形的结构。这些结构可以是固定的也可以是独立的。公认的是，爆炸波和独立结构之间的流体结构相互作用（FSI）减少了施加在结构上的爆炸载荷。数值研究了承受冲击波的自立板的动力响应，以研究FSI在冲击波缓解中的作用。本文提出了一种一维模型，该模型包括自立板的爆炸波反射，板的运动以及在板的背面引起的冲击波。使用Van Leer通量矢量分裂方案，结合单调上游中心守恒律（MUSCL）和Runge-Kutta方案，求解了板正面和背面的Euler方程。法向反射的压力大于斜向和马赫杆反射的压力，后者在入射冲击波的前部和反射表面之间存在入射角时发生。因此，可以预期的是，当爆炸波冲击V形或圆锥形结构时，反射压力会降低。;爆炸波与V形或圆锥形结构之间相互作用的二维数值模型是发达。该模型模拟了V形或圆锥形结构的爆炸波反射，结构的运动以及结构后面的激波。利用椭圆网格生成和坐标变换来求解不规则物理域中的流场。

著录项

  • 作者

    Peng, Wen.;

  • 作者单位

    The University of Nebraska - Lincoln.;

  • 授予单位 The University of Nebraska - Lincoln.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 113 p.
  • 总页数 113
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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