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2016-2017学年第一学期航空航天系第十四期学术讲座
发表时间:2016-12-28 阅读次数:892次

题目:Transition to chaos of natural convection between two vertical differentially heated plates

主讲:Zhenlan GAO Professor

主持:艾剑良 教授

时间:2016年12月28日(周三)下午3:00 - 4: 30

地点:光华楼东主楼2601室

教授简介

Zhenlan GAO holds a permanent position as a CFD R&D Engineer in ECM Technologies Company, Grenoble, France. He was most recently CFD R&D Engineer in EDF R&D Center, Chatou, France. In the 2013-2014 scholar year, He was an assistant professor in Arts et Métiers ParisTech (ENSAM). He received his Ph.D degree in Fluid Mechanics in Université Pierre et Marie Curie (Paris VI) after having worked in LIMSI (Engineering Sciences and Software Laboratory) of CNRS (French National Scientific Research Center), Orsay, France for less than 3 years. Prior to that, He earned his Master of Research in Ecole Polytechnique, Palaiseau, France and his Diplôme d’ingénieur (French Engineer Degree, Master of Mechanical and Industrial Engineering) in Arts et Métiers ParisTech (ENSAM), Paris, France. He received his Bachelor in Aircraft Design and Engineering in Fudan University, Shanghai, China. His research interests include hydrodynamic instabilities, nonlinear dynamics and chaos, pattern formation, heat transfer, transition and turbulence modelling, numerical methods, high performance computing as well as urban climate and micro-meteorology modelling. He is currently in charge of a nuclear fuel sintering furnace design for the 4th generation reactor.  

内容简介

The transition process from laminar to turbulent state in the natural convection between vertical plates is an essential issue which should help us understand, predict and ultimately control the heat transfer in a variety of applications, ranging from industrial equipment such as double-paned windows or heat plate exchangers, to complex weather systems. It is for instance well known that in the case of double-paned windows, the turbulence is desired to be reduced, so as to minimize the heat transfer across the plates, while in the case of plate heat exchangers, the turbulent state is more desirable in order to increase the heat transfer efficiency. However few numerical simulations of the full three-dimensional process exist in such cases where the temperature gradient is orthogonal to the direction of gravity. A better description of natural convection in this configuration could therefore have a considerable, ecological and economic impact in many aspects of our lives. The goal of this research is to carry out a detailed investigation of the natural convection between vertical plates, blending mathematical analysis tools with high performance numerical simulations. Several significant results have been obtained: (i) through numerical simulation we have characterized different stages of the transition procedure, the associated flow structures and their contribution to heat transfer (ii) we found evidence of low-dimensional chaos in the numerical simulation of a reduced domain, which suggests that classical control theory tools could be of direct relevance for the improvement of heat transfer (iii) the configuration studied in this research can be used as a baseline for more complex, multi-physics systems and the results obtained therein could help improve the design of new industrial equipment as well as provide an idealized frame for the study of real geophysical flows.

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