航空航天学院关于内布拉斯加大学林肯分校张肇彦博士学术报告的通知

发布日期:2012-05-24来源:航空航天学院作者:系统管理员访问量:11354

Seminar

NUMERICAL SIMULATION OF BLAST WAVE AND STRUCTURE INTERACTIONS FOR BLAST WAVE MITIGATION

  

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

 

       Dr. Zhaoyan Zhang obtained his BS degree in Mechanical Engineering from the North China University of Electrical Power in 1990. In 2000, he was awarded his Ph.D. degree in Mechanical Engineering by the Pennsylvania State University. He then spent two years as a Post-Doctoral Fellow at the Michigan Technological University and a Research Engineer at then Daimler Chrysler. Dr. Zhang joined the University of Nebraska-Lincoln as an Assistant Professor in 2002. He was promoted to Associate Professor in 2008. His research interests include blast wave mitigation, laser material interactions and diesel engine emissions control.

 

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