Speaker：Prof. Qiang Zhang（张强教授）
Time：16:00-17:00, 30 October 2019 (Wednesday) (Beijing time)
Venue：T2-102
Unstable interfacial mixing occurs in many natural phenomena and industrial processes. Richtmyer-Meshkov instability is a classical problem in this class. In this case, a material interface between two fluids of different densities becomes unstable under the impact of an incident shock. Fingers develop at the unstable material interface. Since the path-breaking work of Richtmyer in 1960, researchers have been actively searching for quantitative theories to predict the growth rates and amplitudes of the unstable fingers. In this talk, we present such theories. Our theories are applicable for compressible fluids, for systems with arbitrary density ratios, for arbitrary incident shock strength, and for entire time domain from early to late times. The theories contain no fitting parameters and the theoretical predictions are in remarkably good agreements with the results from numerical simulations and with the data from experiments.
About Prof. Zhang
Qiang Zhang is a professor in the Department of Mathematics and in the Department of Physics at City University of Hong Kong. He was also a professor in the Department of Economics and Finance at the same university. Prior to joining City University of Hong Kong, he was at Courant Institute of Mathematical Sciences and State University of New York at Stony Brook. He receives his BSc from Fudan University, and MA and PhD from New York University. He has broad research interests including fluid dynamics, scientific computing, mathematical finance, granular materials, and other areas in physics.
