7月8日(周三)院学术报告

报告人:Professor Weizhu Bao(国际数学家大会特邀45分钟报人),  
                 Department of Mathematics National University of Singapore
 
时间:2015年7月8日(周三),下午16:00-17:00
 
地点:后主楼1223
 
题目:  Modeling and Simulation for Solid-State Dewetting Problems
 
摘要:  In this talk, I will present sharp interface models with anistropic surface energy and a phase field model for simulating solid-state dewetting and the morphological evolution of patterned islands on a 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. The phase field model is governed by the Cahn-Hilliard equation with isotropic surface tension and variable scalar mobility and it easily deals with the complex boundary conditions and/or complicated geometry arising in the solid-state dewetting problem. Since the phase field model does not explicitly track the moving surface, it naturally captures the topological changes that occur during film/island morphology evolution.  Efficient and accurate numerical methods for both sharp interface models and phase field models are proposed. They are applied to study numerically different setups of solid-state dewetting including short and long island films, pinch-off, hole dynamics, semi-infinite film, etc. Our results agree with experimental results very well. This is joint works with Wei Jiang, David J. Srolovitz, Carl V. Thompson and Yan Wang.
 
邀请人:张辉
 

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