报告人 ：何晓明（密苏里科技大学）

时间：2023年06月09日 10:00--

地址：理科楼LA106

摘要：In this presentation, we consider the numerical modeling and simulation via the phase field approach for coupled two-phase free flow and two-phase porous media flow of different densities and viscosities. The model consists of the Cahn-Hilliard-Navier-Stokes equations in the free flow region and the Cahn-Hilliard-Darcy equations in porous media that are coupled by several domain interface conditions. It is showed that the coupled model satisfies an energy law. Then we first propose a coupled unconditionally stable finite element method for solving this model and analyze the energy stability for this method. Furthermore, based on the ideas of pressure stabilization and artificial compressibility, we propose an unconditionally stable time stepping method that decouples the computation of the phase field variable, the velocity and pressure of free flow, the velocity and pressure of porous media, hence significantly reduces the computational cost.  The energy stability of this decoupled scheme with the finite element spatial discretization is rigorously established. We verify numerically that our schemes are convergent and energy-law preserving. Numerical experiments are also performed to illustrate the features of two-phase flows in the coupled free flow and porous media setting.

简介：何晓明， 2002年与2005年在四川大学数学学院分别获学士与硕士学位， 2009年在弗吉尼亚理工大学数学系获博士学位，2009年至2010年在佛罗里达州立大学作博士后。2010年至2016年在美国密苏里科技大学任助理教授，2016年晋升为副教授并获终身教职，2021年晋升为正教授。2018年获得Humboldt Research Fellowship for Experienced Researchers。担任计算数学领域国际期刊International Journal of Numerical Analysis & Modeling的Managing editor。从2012年起主持了多项由美国国家科学基金会和美国能源部资助的科研项目。2014-2016年担任SIAM美国中部分会的第一任主席和前两届年会的组织委员会主席。2019年起担任Midwest Numerical Analysis Day的组织委员成员。2021年1月起担任SIAM Committee on Programs and Conferences成员。2021年7月起担任密苏里科技大学Faculty Fellow to Vice Chancellor of Research and Innovation。何晓明教授主要的研究领域是计算科学与工程。研究问题主要包括界面问题，计算流体力学，计算电磁学，有限元方法，各类解耦算法，数据同化，随机偏微分方程，控制问题等。他将计算数学与实际工程应用问题结合起来，在科学计算和应用领域做了大量的工作,在SIAM Journal on Scientific Computing，Journal of Computational Physics，Computer Methods in Applied Mechanics and Engineering, SIAM Journal on Numerical Analysis， Mathematics of Computation，Numerische Mathematik，IEEE Transactions on Plasma Science, Lab on a Chip等杂志发表论文90余篇。

邀请人：王坤

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