报告题目：Extreme fluctuations in turbulent flows and universality

报告人： Alain Pumir 教授，法国国家科学研究中心

报告时间：2025年9月29日（星期一）, 下午14:30-15:30

报告地点：致知楼3624

报告摘要:

Turbulent flows are characterized by highly intense fluctuations, which exhibit a marked increase in strength with increasing turbulence intensity, i.e. at elevated Reynolds numbers. This lecture will address certain elementary properties of these large fluctuations, utilizing data derived from numerical simulations conducted at Reynolds numbers of extreme magnitude. One of the key physical postulates that underpins the study of turbulence is the notion that the properties of motion become universal, i.e. flow-independent, as the Reynolds number of the flow increases. The following argument will be put forward: data from different flows does suggest universal properties of the flow.

报告人简介:

Alain Pumir教授是美国物理学会会士，荣获德国亚历山大·冯·洪堡基金会颁发的亚历山大·冯·洪堡教席—国际研究奖，并被授予法国荣誉军团骑士勋章。作为法国国家科学研究中心（CNRS）的研究员，他先后任职于巴黎高等师范学院、尼斯非线性研究所和里昂高等师范学院任职，并长期在美国康奈尔大学、美国国家大气科学中心以及德国哥廷根的马克斯—普朗克动力学与自组织研究所开展访问研究。Pumir教授在非线性动力学与模式形成、流体湍流及生物物理学等领域拥有广泛的研究兴趣与杰出成果。