主讲人：Professor Weizhu Bao（Department of Mathematics National

        University of Singapore）

时  间：2014年7月2日（周一）上午10:00-11:00

地  点：必赢76net线路官网北一区文科楼 302教室

摘  要：In this talk, I will present sharp interface models with anistropic surface energy anda 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 tensionand 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 modeldoes not explicitly track the moving surface, it naturally captures the topological changes that occurduring 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, holedynamics, 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.