【题目】：Numerical Simulations on Hypersonic Boundary-Layer Stability and Transition Control
【时间】：2014年4月15日15:00
【地点】：西区力学一楼二层239多媒体教室
【主讲】：王晓文博士，UCLA
【主办】：工程科学学院 近代力学系
【承办】：激波实验室
【报告简介】
Strategies to delay transition or keep laminar boundary layers around air vehicles can result in smaller drag, lower surface heating, and higher fuel efficiency. However, the success of control strategies relies on a fundamental understanding of transition mechanisms. In this talk, I will first discuss numerical simulations on the stability of a Mach 8 flow over a sharp wedge to wall blowing-suction. The results consistently show that the most unstable wave in hypersonic boundary layers at a specific frequency is only strongly excited when the blowing-suction actuator is located upstream of the corresponding synchronization point. Therefore, the synchronization point plays an important role in hypersonic boundary-layer stability. I will then discuss some results of numerical simulations on transition control of hypersonic boundary layers by using surface porous coating and surface roughness.
【主讲人简介】
Xiaowen Wang is a research associate and lecturer working in the Mechanical and Aerospace Engineering Department at UCLA. He holds a Ph.D. degree in Mechanical Engineering from UCLA in 2007, and a MS degree in Fluid Mechanics (2002), a BS degree in Theoretical and Applied Mechanics (1999) from University of Science and Technology of China. He is a senior member of AIAA and a member of the AIAA Applied Aerodynamics Technical Committee. His main research interests are high-order numerical methods and computational fluid dynamics on hypersonic boundary-layer receptivity and stability, stabilization of hypersonic boundary layers by using porous coating, and hypersonic non-equilibrium flow.