徐辉副教授赴我院做学术报告

应我院力学系董明老师邀请，上海交通大学徐辉副教授赴我院做学术报告，欢迎老师和同学们届时踊跃参加。

报告题目：《A discussion on dimple/bump induced boundary layer transitions》

报告时间：2019年3月25日，下午 15:00

报告地点：卫津路校区 北洋科学楼311

摘要：

The role of a smooth isolated three-dimensional (3D) dimple/bump on laminar-turbulent transition in a flat-plate boundary layer is numerically studied. The main concern lies with the recent discovery of the significant difference between a surface indentation and a bump intruding into the main boundary layer. The study aims at comprehensively elucidating the observed differences, which is a follow-up to Xu et. al. (2017, doi.org/10.1017/jfm.2017.193) where the role of a localised 3D dimple intruding into the surface was investigated numerically by linear and nonlinear analysis, together with complementary experiments. Here, it is shown that if only modification and destabilisation of Tollmien-Schlichting disturbances are assessed in a similar parameter regime as used by Xu et. al. (2017), the transition induced by an isolated bump is more catastrophic than that induced by a surface indentation. In both cases, with a deep (or high) enough indentations, fully 3D laminar separation bubbles arise, which lead to strongly destabilising behaviour. Based on concepts of the critical Reynolds number and global linear stability theory, in the parameter regime, capturing the transition pathway around an isolated bump/dimple will be further discussed.

简历：

徐辉老师是上海交通大学航空航天学院长聘副教授。于西安交通大学数学专业取得学士与硕士学位；并于动力工程与工程热物理专业取得博士学位；随后于巴黎第六大学及帝国理工从事科学研究。他一直在流体力学、应用数学和计算数学交叉领域从事相关理论与应用研究。他是hp 型谱元法开源软件Nektar++的不可压缩及可压缩求解器的开发人员；并将高精度hp 型谱元方法首次应用于重大工程需求中。担任Journal of Hydrodynamics 编委。

他的科研主要涉及高精度数值计算、气动力学与气动声学、湍流、层流-湍流转捩、动力学理论等。他的科研工作与工程问题紧密结合，在理论与应用方面同时开展工作。他的科研论文主要发表在Journal of Fluid Mechanics、Journal of Computational Physics、SIAM Journal on Scientific Computing等国际著名杂志。