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An Essential Extension of the Finite-Energy Condition for Extended Runge-Kutta-Nyström Integrators when Applied to Nonlinear Wave Equations

Published online by Cambridge University Press:  06 July 2017

Lijie Mei*
Affiliation:
School of Mathematics & Computer Science, Shangrao Normal University, Shangrao 334001, P.R. China
Changying Liu*
Affiliation:
Department of Mathematics, Nanjing University; State Key Laboratory for Novel Software Technology at Nanjing University, Nanjing 210093, P.R. China
Xinyuan Wu*
Affiliation:
School of Mathematical Sciences, Qufu Normal University, Qufu 273165, P.R. China
*
*Corresponding author. Email addresses:bxhanm@126.com (L. Mei), chyliu88@gmail.com (C. Liu), xywu@nju.edu.cn (X.Wu)
*Corresponding author. Email addresses:bxhanm@126.com (L. Mei), chyliu88@gmail.com (C. Liu), xywu@nju.edu.cn (X.Wu)
*Corresponding author. Email addresses:bxhanm@126.com (L. Mei), chyliu88@gmail.com (C. Liu), xywu@nju.edu.cn (X.Wu)
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Abstract

This paper is devoted to an extension of the finite-energy condition for extended Runge-Kutta-Nyström (ERKN) integrators and applications to nonlinear wave equations. We begin with an error analysis for the integrators for multi-frequency highly oscillatory systems , where M is positive semi-definite, . The highly oscillatory system is due to the semi-discretisation of conservative, or dissipative, nonlinear wave equations. The structure of such a matrix M and initial conditions are based on particular spatial discretisations. Similarly to the error analysis for Gaustchi-type methods of order two, where a finite-energy condition bounding amplitudes of high oscillations is satisfied by the solution, a finite-energy condition for the semi-discretisation of nonlinear wave equations is introduced and analysed. These ensure that the error bound of ERKN methods is independent of . Since stepsizes are not restricted by frequencies of M, large stepsizes can be employed by our ERKN integrators of arbitrary high order. Numerical experiments provided in this paper have demonstrated that our results are truly promising, and consistent with our analysis and prediction.

Type
Research Article
Copyright
Copyright © Global-Science Press 2017 

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