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航空学院青年学术论坛第180讲-北京大学工学院 杨延涛 特聘研究员
2020-01-10 10:25   審核人:

 

报 告 人:北京大学工学院 杨延涛 特聘研究员
邀 请 人:郗恒東教授
報告時間113日(周一)上午9:00-10:00

報告地點:友誼校區航空樓A706

報告題目Double diffusive convection and thermohaline staircases

 

        要:

Double diffusive convection (DDC), i.e. the buoyancy-driven flow with fluid density depending on two scalar components, is omnipresent in many natural and engineering environments. In ocean this is especially true since the seawater density is mainly determined by temperature and salinity. In upper water of both (sub-) tropical and polar oceans, DDC causes the intriguing thermohaline staircases, which consist of alternatively stacked convection layers and sharp interfaces with high gradients of temperature and salinity.

In this talk, we will focus on the fingering DDC usually found in (sub-)tropical ocean, where the mean temperature and salinity decrease with depth. We numerically investigate the formation and the transport properties of finger structures and thermohaline staircases. Moreover, we show that multiple states exit for the exactly same global condition, and individual finger layers and finger layers within staircases exhibit very different transport behaviors.

 

報告人簡介:

楊延濤,理學博士,現任北京大學工學院特聘研究員。20047月獲北京大學力學系學士學位,20097月獲北京大學工學院流體力學專業理學博士學位。2011年至2013年擔任北京大學應用物理與技術中心培源學者博士後,2013年至2017年受荷蘭FOM基金會資助在荷蘭Twente大學做博士後研究工作,20175月起加入北京大學工學院。當前研究主要集中在浮力驅動對流湍流,如海洋相關的溫鹽驅動雙擴散對流,以及主動脈血液動力學數值模擬等等。

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