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High Order Semi-implicit IMEX WENO Scheme for the Euler System with All-Mach Number

主  办:爆炸科学与技术国家重点实验室

          安全与防护协同创新中心

报告题目:High Order Semi-implicit IMEX WENO Scheme for the Euler System with All-Mach Number

报告人:Prof. Jingmei Qiu

                University of DelawareUSA

时间:20191211日上午10:00

地点:北京理工大学3号教学楼146会议室

报告人简介:邱竞梅,2003年,本科毕业于中国科学技术大学数学系。2007年,博士毕业于美国布朗大学应用数学系。2008.8-2011.8,美国科罗拉多矿业大学数学系,助理教授。2011.9-2014.8,美国休斯顿大学数学系助理教授。2014.9-2016.8,美国休斯顿大学数学系副教授。2016.9至今,美国特拉华大学数学系教授。主要研究方向:针对双曲守恒方程的高阶数值方法,包括WENODG等,全马赫数问题的多尺度算法,对流占优问题的半拉格朗日方法等。

报告摘要:

We propose a high order asymptotic preserving method for all-Mach number simulations. In particular, we focus on finite difference schemes with weighted essentially non-oscillatory (WENO) reconstructions coupled with proper implicit-explicit (IMEX) Runge Kutta (RK) treatments for the system. The proposed method can robustly capture shock fronts in the compressible regime when the Mach number is of order 1; The schemes automatically become high order, stable and consistent solvers for the incompressible Euler system when the Mach number approaches 0; The schemes are high order accurate in both space and in time both when the acoustic waves are well-resolved and are under-resolved. 1D and 2D numerical results will be presented to showcase the method.