2025年數學系學術講座(六)

發布時間: 2025-03-28 來源: 太阳集团1088vip

題目一:Highly efficient and energy stable Multi-step SAV approaches for phase field models

内容簡介:Recently, the scalar auxiliary variable (SAV) approach and its extended SAV-based approaches have been widely used to simulate a series of phase field models. However, many SAV-based schemes are known for the stability of a ‘modified’ energy. In this paper, we construct a series of modified SAV approaches with unconditional energy dissipation law based on several improvements to the traditional SAV approach. Firstly, by introducing the three-step technique, we can reduce the number of constant coefficient linear equations that need to be solved at each time step, while retaining all of its other advantages. Secondly, the addition of energy-optimized technique and SAV/Lagrange multiplier technique can make the numerical schemes have the advantage of preserving the original energy dissipation. Thirdly, we use the first-order approximation of the energy balance equation in the GSAV approach, instead of discretizing the dynamic equation of the auxiliary variable, so that we can construct the high-order unconditional original energy stable numerical schemes. Finally, representative numerical examples show that the efficiency and accuracy of the proposed schemes are improved.

報告人:陳豔萍

報告人簡介:南京郵電大學教授。2008年被聘為廣東省高等學校珠江學者特聘教授,2004年享受國務院頒發的政府特殊津貼、入選教育部首批新世紀優秀人才支持計劃,2002年評為教育部首批全國高等學校優秀骨幹教師。2017年獲教育部自然科學二等獎、2012年獲廣東省科學技術二等獎、2011年獲湖南省自然科學一等獎、2008年獲教育部自然科學一等獎、2004年獲湖南省科學技術進步二等獎。

出版專著《最優控制問題高效算法理論》(英文版,科學出版社,2015年11月,由國家出版基金資助、入選信息與計算科學叢書)和教材《最優控制問題高效算法理論》(英文版)、《偏微分方程數值解》、《數值計算方法》和《數學建模教學與評估指南》,在SIAM Numer. Anal. 和Math. Comp. 等國際一流學術期刊上發表學術論文300餘篇,是ESI高被引論文作者,2014年至2023年連續10年入選Elsevier中國高被引學者榜單。主持國家自然科學基金重點項目1項、面上項目7項、訪問學者項目1項、重大研究計劃培育項目1項。

 

 

時  間:2025年4月1日(周二)上午10:30開始

地  點:騰訊會議:366-243-446

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