报告题目：

Two-gird methods for semilinear elliptic interface problems by immersed finite element methods

报 告 人：

陈艳萍 教授（华南师范大学）

报告时间：

2018年07月12日 15:00--16:00

报告地点：

理学院东北楼四楼报告厅(404)

报告摘要：

In this talk, three efficient two-grid algorithms are proposed and

analyzed for semi-linear interface problems with discontinuous diffusion coefficients in two dimension. Because of the advantages of simple structure of Cartesian grids and the finite element formulation, we use immersed finite element discretization. To linearize the finite element method equations, two-grid algorithms based on some Newton iteration approach and residual-correction technique are applied. It is shown that the coarse space can be extremely coarse, and yet one can still achieve asymptotically optimal approximations as good as solving the original nonlinear problem on the fine mesh. As a result, solving such a large class of nonlinear equation will not be

much more difficult than solving one linearized equation.