题 目：On the Structured Convection
报告人：J.M. Floryan Western University, Canada
时间：2026年10月16日星期五下午13:30
地点：上海大学延长校区力学所200学术报告厅
专家简介
J.M. Floryan is a Professor at Western University, Canada. He received his Ph.D. from Virginia Tech in 1980 and conducted postdoctoral research at Northwestern University. He has held visiting positions at several prestigious institutions worldwide, including the National University of Singapore, Stuttgart University, and Los Alamos National Laboratory. His research focuses on fluid mechanics, particularly passive and active flow control using surface roughness, suction, heating, and vibration. He has served as President of the Canadian Society for Mechanical Engineering (CSME) and the Canadian Congress of Applied Mechanics (CANCAM), and as Chair of ICTAM 2016. He is a Fellow of APS, ASME, CSME, and several other professional societies. His numerous honors include the Humboldt Research Prize and the Robert W. Angus Medal. He currently serves as the Canadian representative to IUTAM and Chair of the Canadian Committee for Applied Mechanics.
摘要信息
Natural convection driven by heating patterns is known as structured convection. It gives rise to fascinating new physics. It has been determined so far that it can reduce pressure losses in conduits, intensify mixing, be used to extract energy from the flow (energy harvesting), give rise to thermal drift and nonlinear thermal streaming, can be used for propulsion, used for horizontal pumping (horizontal chimney effect), can be used to create streaks and rolls in shear layers, and can dominate local contamination transport. Thermal-wave patterns offer exciting applications beyond pumping in conduits, including wind generation. Combining heating and topography patterns activates the pattern interaction effect, whose strength changes significantly with minor changes in both patterns' relative positions, similar to initial conditions in a chaotic system. The spatial parametric resonance drives the stability of such flows, which can give rise to many flow structures, including solitons. Heating patterns frequently occur in nature, e.g., in the surface topography (building pattern) and the thermally relevant features of this topography, such as color variations (color patterns of roofs, streets, and parks) in the urban environment (heat island effect). Similar conditions are encountered in rural environments, where local circulation can be driven by differences in the heating rates of forests and lakes and modified by terrain topography. We will discuss recent progress in the analysis of structured convection.
