报告人:牛春艳
报告地点:腾讯会议ID:879-565-737
报告时间:2025年09月20日星期六18:15—19:00
邀请人:数学与统计学院
报告摘要:
In this talk, we introduce a hybrid mixed finite element method for Biot’s model. The hybrid P1-RT0-P0 discretization of the displacement-pressure-Darcy’s velocity system of Biot’s model presented in literature is not uniformly stable with respect to the physical parameters, resulting in some issues in numerical simulations. To alleviate such problems, we stabilize the hybrid scheme with face bubble functions and show the well-posedness with respect to physical and discretization parameters, which provide optimal error estimates of the stabilized method. We introduce a perturbation of the bilinear form of the displacement which allows for the elimination of the bubble functions. Together with eliminating Darcy’s velocity by hybridization, we obtain an eliminated system whose size is the same as the classical P1-RT0-P0 discretization. Based on the well-posedness of the eliminated system, we design block preconditioners that are parameter robust.
主讲人简介:
牛春艳,郑州大学数学与统计学院副教授。承担教育部产学合作协同育人项目以及中国博士后基金。研究方向为偏微分方程数值方法、大型稀疏线性系统的快速求解算法及优化、机器学习及其在盾构智能掘进中的应用, 在Computational Geosciences、CNSNS等知名学术期刊发表多篇研究论文。