计算数学学术报告
报告人：
Dr. Pengtao Sun
Dept. of Mathematical Sciences
University of Nevada Las Vegas

报告题目：
Dirichlet/Robin Iteration-by-subdomain DDM For Multiphase PEMFC With Micro-porous Layer

时间： 2011年7月4日（星期一）下午：13:30-14:30

地点： 闵行校区数学楼126报告厅

报告摘要：
In this talk, an efficient numerical method for a three-dimensional, two-phase transport model is presented for polymer electrolyte fuel cell (PEFC) including multi-layer diffusion media, composed of two or more layers of porous materials having different pore sizes and/or wetting characteristics. Particularly, capillary pressure is continuous, whereas liquid saturation is discontinuous, across the interface of gas diffusion layer (GDL) and micro-porous layer (MPL), which can improve liquid-water transport in the porous electrode. We design a nonlinear Dirichlet/Robin iteration-by-subdomain domain decomposition method to deal with water transport in such multi-layer diffusion media, where Kirchhoff transformation and its inverse techniques are employed to conquer the discontinuous water diffusivity in the coexisting single- and two-phase regions. In addition, the conservation equations of mass, momentum, charge, hydrogen and oxygen transport are numerically solved by finite element-upwind finite volume method. Numerical simulations demonstrate that the presented techniques are effective to obtain a fast and convergent nonlinear iteration for a 3D full PEFC model within around a hundred steps. A series of numerical convergence tests are carried out to verify the efficiency and accuracy of our numerical algorithms and techniques.