Seminar
NUMERICAL SIMULATION OF BLAST WAVE
Speaker: Dr. Zhaoyan Zhang, University of Nebraska-Lincoln, USA
Date and Time: 9:00 – 10:30 am, June 1, 2012
Location: Room 333, Teaching Building 5
Abstract
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 wave and structure is a very important step in the development of devices for blast wave mitigation.
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. We developed 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 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 was further developed. The model simulates the blast wave reflection, 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.
Speaker’s CV
