报 告 人：北京大学工学院 杨延涛 特聘研究员
邀 请 人：郗恒东教授
报告时间：1月13日（周一）上午9:00-10:00
报告地点：友谊校区航空楼A706
报告题目：Double diffusive convection and thermohaline staircases
摘 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.
报告人简介:
杨延涛，理学博士，现任北京大学工学院特聘研究员。2004年7月获北京大学力学系学士学位，2009年7月获北京大学工学院流体力学专业理学博士学位。2011年至2013年担任北京大学应用物理与技术中心“培源学者”博士后，2013年至2017年受荷兰FOM基金会资助在荷兰Twente大学做博士后研究工作，2017年5月起加入北京大学工学院。当前研究主要集中在浮力驱动对流湍流，如海洋相关的温盐驱动双扩散对流，以及主动脉血液动力学数值模拟等等。
