Modeling and Simulation for Solid-State Dewetting Problems
主 题: Modeling and Simulation for Solid-State Dewetting Problems
报告人: Professor Weizhu Bao (National University of Singapore)
时 间: 2014-07-11 10:30-11:30
地 点: 理科一号楼1365室（主持人：李铁军）
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.
