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Sharp Interface Models for Solid-State Dewetting Problems

【数学与统计及交叉学科前沿论坛------高端学术讲座第151场】


报告题目:Sharp Interface Models for Solid-State Dewetting Problems

报 告 人:包维柱教授 新加坡国立大学

报告时间:51216:00-17:00

报告地点:阜成路校区综合楼1116会议室


报告摘要:In this talk, I will present sharp interface models with anisotropic surface energy for simulating solid-state dewetting and the morphological evolution of patterned islands on a substrate. We will show how to derive the sharp interface model via thermovariation dynamics, i.e. variation of the interfacial energy via an open curve with two triple points moving along a fixed substrate. The sharp interface model tracks the moving interface explicitly and it is very easy to be handled in two dimensions via arc-length parametrization. An efficient and accurate parameteric finite element method (PFEM) was proposed for the sharp interface models. It is applied to study numerically different setups of solid-state dewetting including short and long island films, pinch-off, hole dynamics, semi-infinite film, tiny particle migration, etc. Our results agree with experimental results very well. In addition, extension to curved substrate and three dimensions will be discussed. Finally, we also present a reduced variatonal model via the Onsager's principle for small particle migration in solid-state dewetting. This is joint works with Wei Jiang, Yifei Li, David J. Srolovitz, Yan Wang and Quan Zhao.


报告人简介:包维柱教授现为新加坡国立大学NUS理学院副院长,新加坡科学院院士,美国工业与应用数学学会会士(SIAM Fellow),美国数学会会士(AMS Fellow)。1987-1995就读于清华大学数学系,先后获学士硕士和博士学位。曾先后在清华大学、英国帝国理工学院及美国佐治亚理工学院任教、做博士后或访问学者。2001年起,在新加坡国立大学工作,并于2009年晋升为教授。现为该校数学系provost’s讲座教授。此外2011年起,兼职于北京计算科学研究中心,任客座教授,指导博士后研究工作。2013年获冯康科学计算奖,2014年应邀在第26届国际数学家大会(ICM)上作45分钟邀请报告,2024年被选为国际工业与应用数学联盟(ICIAM)的Officer-at-Large,担任包括SIAM Journal on Scientific Computing等多个国际期刊杂志编委。包维柱教授长期从事科学与工程计算研究,主要工作涉及偏微分方程数值方法及其在量子物理、流体和材料中的应用。特别是在Bose-Einstein 凝聚的数值方法及应用、高震荡色散类偏微分方程的多尺度算法和分析、无界区域上科学和工程问题的计算等方面取得了多个重要进展。