报告人：张继伟 教授（武汉大学）

时间：2026年06月23日 11:15-

地点：理科楼LA103

摘要：While the variable time-steps two-step backward differentiation formula (BDF2) is valuable and widely used to capture the multi-scale dynamics of model solutions, the stability and convergence of BDF2 with variable time steps still remain incomplete. In this talk, we will revisit BDF2 scheme for a class of linear and nonlinear problems and present that BDF2 scheme is unconditionally stable under a mild adjacent time-step ratio condition, and achieve the second-order temporal convergence in L2- and H1-norms. Our analysis shows that the second-order convergence is sharp and robust.

邀请人：邱越

欢迎广大师生积极参与！