报告人：孙海卫（澳门大学）

邀请人：李东方

报告时间：2022年3月2日（星期三）9:00-11:00

报告地点：腾讯会议 668 480 527  密码：0302

报告题目：Strang's splitting method for spatial fractional Allen-Cahn equations

报告摘要：In this talk, we study the numerical solutions of the spatial fractional Allen-Cahn equations. After semi-discretization for the spatial fractional Riesz derivative, a system of nonlinear ordinary differential equations with Toeplitz structure is obtained.  For the sake of reducing the computational complexity, Strang splitting methods are proposed where the Toeplitz matrix in the system is split into the sum of a circulant matrix and a skew circulant matrix. Therefore, the proposed method can be quickly implemented by the fast Fourier transform, substituting to calculate the expensive Toeplitz matrix exponential. Theoretically, the discrete maximum principle of our method is unconditionally preserved. Moreover, the analysis of error in norms in Banach space with second-order accuracy is conducted in both time and space. Finally, numerical tests are given to corroborate our theoretical conclusions and the efficiency of the proposed method.

报告人简介：孙海卫，澳门大学数学系主任、教授。主要研究领域为数值线性代数、分数阶偏微分方程快速算法、数值偏微分方程以及计算金融等。在SIAM J. Numer. Anal, SIAM J. Sci. Comput等众多计算数学权威期刊上发表高水平研究论文80余篇，担任国际期刊“International Joural Computer Mathematics"的编委。