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Fourth Order Exponential Time Differencing Method with Local Discontinuous Galerkin Approximation for Coupled Nonlinear Schrödinger Equations

Published online by Cambridge University Press:  23 January 2015

X. Liang*
Affiliation:
Department of Mathematical Sciences and Center for Computational ScienceMiddle Tennessee State University, Murfreesboro, TN 37132-0001, USA
A. Q. M. Khaliq
Affiliation:
Department of Mathematical Sciences and Center for Computational ScienceMiddle Tennessee State University, Murfreesboro, TN 37132-0001, USA
Y. Xing
Affiliation:
Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 and Department of Mathematics, University of Tennessee, Knoxville, TN 37996, USA
*
*Email addresses: xl2h@mtmail.mtsu.edu (X. Liang), Abdul.Khaliq@mtsu.edu (A. Q. M. Khaliq), xingy@math.utk.edu (Y. Xing)

Abstract

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This paper studies a local discontinuous Galerkin method combined with fourth order exponential time differencing Runge-Kutta time discretization and a fourth order conservative method for solving the nonlinear Schrödinger equations. Based on different choices of numerical fluxes, we propose both energy-conserving and energy-dissipative local discontinuous Galerkin methods, and have proven the error estimates for the semi-discrete methods applied to linear Schrödinger equation. The numerical methods are proven to be highly efficient and stable for long-range soliton computations. Extensive numerical examples are provided to illustrate the accuracy, efficiency and reliability of the proposed methods.

Information

Type
Research Article
Copyright
Copyright © Global Science Press Limited 2015