Abstract
In this paper, we study a family of discontinuous Galerkin (DG) fully discrete schemes for solving the second-order wave equation. The spatial variable discretization is based on an application of the DG method. The temporal variable discretization depends on a parameter \(\theta \in [0,1]\). Under suitable regularity hypotheses on the solution, optimal order error bounds are shown for the numerical schemes with \(\theta \in [\frac{1}{2},1]\), unconditionally with respect to the spatial mesh-size and the time-step, and for the numerical schemes with \(\theta \in [0,\frac{1}{2})\) where a Courant–Friedrichs–Lewy stability condition is satisfied relating the mesh-size and the time-step. The optimal order error estimates are derived for \(H^{1}(\Omega )\) and \(L^{2}(\Omega )\) norms. Simulation results are reported to provide numerical evidence of the optimal convergence orders predicted by the theory.

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Communicated by Pierangelo Marcati.
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Limin He: The work of this author was partially supported by the National Natural Science Foundation of China (Grant No. 11801287, 62065015).
Fei Wang: The work of this author was partially supported by the National Natural Science Foundation of China (Grant No. 11771350).
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He, L., Han, W. & Wang, F. On a family of discontinuous Galerkin fully-discrete schemes for the wave equation. Comp. Appl. Math. 40, 56 (2021). https://doi.org/10.1007/s40314-021-01423-8
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DOI: https://doi.org/10.1007/s40314-021-01423-8
Keywords
- Wave equation
- Discontinuous Galerkin methods
- Fully discrete approximation
- Optimal order error estimates