OPTIMAL ERROR ESTIMATES OF THE LOCAL DISCONTINUOUS GALERKIN METHOD WITH GENERALIZED NUMERICAL FLUXES FOR ONE-DIMENSIONAL KDV TYPE EQUATIONS  

作　　者：Hongjuan Zhang Xiong Meng Dazhi Zhang Boying Wu 

机构地区：[1]School of Mathematics,Harbin Institute of Technology,Harbin 150001,China

出　　处：《Journal of Computational Mathematics》2025年第1期63-88,共26页计算数学(英文)

基　　金：supported by the National Natural Science Foundation of China(Grant No.11971132);by the Natural Science Foundation of Heilongjiang Province(Grant No.YQ2021A002);by the Fundamental Research Funds for the Central Universities(Grant No.HIT.OCEF.2022031);The third author was supported by the Guangdong Basic and Applied Basic Research Foundation(Grant No.2020B1515310006);The fourth author was supported by the National Natural Science Foundation of China(Grant Nos.11971131,61873071).

摘　　要：In this paper, we investigate the local discontinuous Galerkin method with generalized numerical fluxes for one-dimensional nonlinear Korteweg-de Vries type equations. The numerical flux for the nonlinear convection term is chosen as the generalized Lax-Friedrichs flux, and the generalized alternating flux and upwind-biased flux are used for the dispersion term. The generalized Lax-Friedrichs flux with anti-dissipation property will compensate the numerical dissipation of the dispersion term, resulting in a nearly energy conservative scheme that is useful in resolving waves and is beneficial for long time simulations. To deal with the nonlinearity and different numerical flux weights, a suitable numerical initial condition is constructed, for which a modified global projection is designed. By establishing relationships between the prime variable and auxiliary variables in combination with sharp bounds for jump terms, optimal error estimates are obtained. Numerical experiments are shown to confirm the validity of theoretical results.

关 键 词：Korteweg-de Vries type equations Local discontinuous Galerkin method Generalized fluxes Error estimates 

分 类 号：O17[理学—数学]