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Seminar - Time-resolved Measurements and Mode Decomposition of Separated Flows and Wakes by Prof Yingzheng Liu
日期:2016 年 02 月 19 日 ( 星期五)
Time:11:00 am – 12:00 pm
Venue:EF312

Abstract:

The state-of-the-art measurement technologies like time-resolved particle image velocimetry, fast-response pressure sensitive paint (PSP), grid pattern PSP/TSP, low-speed flow PSP, phosphor thermography are first presented. Two data-driven analysis methodologies, i.e., POD and DMD, are extensively assessed in terms of identification of unsteady structures. Finally, the progress of recent research efforts on time-resolved measurements and mode decomposition of separated flows and wakes are briefly reported, e.g., submerged jet, wake dynamics behind bio-inspired structures, energy harvesting eel, impingement heat transfer, ribbed channel heat transfer, and film cooling heat transfer.

Bio-sketch:

Dr. Yingzheng Liu obtained his BS and PhD degrees in mechanical engineering from Shanghai Jiao Tong University (SJTU) in 1995 and 2000, respectively. Dr. Liu has been working as a faculty member in the Department of Power Machinery Engineering of SJTU after his graduation, and was promoted to full Professor in 2007. Dr. Liu has been served as the Associate Dean for International Affairs & Industrial Relations of SJTU School of Mechanical Engineering during 2009 and 2014. Dr. Liu was a visiting scholar in Flow Control Lab in Korea Advanced Institute of Science and Technology (KAIST, South Korea) from 2002 to 2004. His research interests include flow separation and control; drag reduction and wake characteristics behind bluff bodies; advanced flow diagnostic techniques such as microphone arrays for wall pressure fluctuation measurements and time-resolved PIV techniques; advanced data processing techniques such as cross correlation, Wavelet, Proper Orthogonal Decomposition (POD), and Dynamic Mode Decomposition (DMD) for turbulent flow studies. Dr. Liu has published over 70 international journal papers, and 30 peer reviewed conference papers. Right now, he serves as associate editor for Journal of Fluids and Structures, and editor for Journal of Flow Visualization and Image Processing.