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Numerical analysis of a continuous Galerkin method for damped sine‐Gordon equation
Author(s) -
Zhao Zhihui,
Li Hong
Publication year - 2020
Publication title -
numerical methods for partial differential equations
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.901
H-Index - 61
eISSN - 1098-2426
pISSN - 0749-159X
DOI - 10.1002/num.22477
Subject(s) - mathematics , uniqueness , galerkin method , convergence (economics) , norm (philosophy) , grid , numerical analysis , a priori and a posteriori , computation , mathematical analysis , variable (mathematics) , sine , stability (learning theory) , discontinuous galerkin method , finite element method , algorithm , computer science , geometry , philosophy , physics , epistemology , law , economics , thermodynamics , economic growth , machine learning , political science
In this article, we discuss the numerical solution for the two‐dimensional (2‐D) damped sine‐Gordon equation by using a space–time continuous Galerkin method. This method allows variable time steps and space mesh structures and its discrete scheme has good stability which are necessary for adaptive computations on unstructured grids. Meanwhile, it can easily get the higher‐order accuracy in both space and time directions. The existence and uniqueness to the numerical solution are strictly proved and a priori error estimate in maximum‐norm is given without any space–time grid conditions attached. Also, we prove that if the mesh in each time level is generated in a reasonable way, we can get the optimal order of convergence in both temporal and spatial variables. Finally, the convergence rates are presented and analyzed by some numerical experiments to illustrate the validity of the scheme.