Unconditional optimal error estimates of linearized second-order BDF Galerkin FEMs for the Landau-Lifshitz equation

2021 ◽  
Vol 159 ◽  
pp. 21-45
Author(s):  
Yun-Bo Yang ◽  
Yao-Lin Jiang
Keyword(s):  
Error Estimates ◽  
Second Order ◽  
Optimal Error Estimates ◽  
Optimal Error ◽  
Lifshitz Equation

scholarly journals Central discontinuous Galerkin methods on overlapping meshes for wave equations

2020 ◽  
Author(s):  
Yong Liu ◽  
Jianfang Lu ◽  
Chi-Wang Shu ◽  
Mengping Zhang
Keyword(s):  
Error Estimates ◽  
Discontinuous Galerkin ◽  
Wave Equations ◽  
Dispersion Analysis ◽  
Second Order ◽  
Optimal Order ◽  
Optimal Error Estimates ◽  
Optimal Error ◽  
Optimal Order Of Convergence ◽  
Central Discontinuous Galerkin

In this paper, we study the central discontinuous Galerkin (DG) method on overlapping meshes for second order wave equations. We consider the first order hyperbolic system, which is equivalent to the second order scalar equation, and construct the corresponding central DG scheme. We then provide the stability analysis and the optimal error estimates for the proposed central DG scheme for one- and multi-dimensional cases with piecewise ${P}^k$ elements. The optimal error estimates are valid for uniform Cartesian meshes and polynomials of arbitrary degree $k\geq 0$. In particular, we adopt the techniques in \cite{liu2018central, liu2020pk} and obtain the local projection that is crucial in deriving the optimal order of convergence. The construction of the projection here is more challenging since the unknowns are highly coupled in the proposed scheme. Dispersion analysis is performed on the proposed scheme for one dimensional problems, indicating that the numerical solution with $P^1$ elements reaches its minimum with a suitable parameter in the dissipation term. Several numerical examples including accuracy tests and long time simulation are presented to validate the theoretical results.

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