Abstract
A two-level additive Schwarz preconditioner based on the overlapping domain decomposition approach is proposed for the local \(C^0\) discontinuous Galerkin (LCDG) method of Kirchhoff plates. Then with the help of an intergrid transfer operator and its error estimates, it is proved that the condition number is bounded by \(O(1+(H^4/\delta ^4))\), where H is the diameter of the subdomains and \(\delta \) measures the overlap among subdomains. And for some special cases of small overlap, the estimate can be improved as \(O(1+(H^3/\delta ^3))\). At last, some numerical results are reported to demonstrate the high efficiency of the two-level additive Schwarz preconditioner.
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Acknowledgements
The authors thank the referees for their valuable comments leading to improvement of an early version of the paper. The first author was supported under NSFC (Grant no. 11571237). The second author was supported under NSFC (Grant no. 11771338), and the Fundamental Research Funds for the Central Universities.
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Huang, J., Huang, X. A Two-Level Additive Schwarz Preconditioner for Local \(C^0\) Discontinuous Galerkin Methods of Kirchhoff Plates. Commun. Appl. Math. Comput. 1, 167–185 (2019). https://doi.org/10.1007/s42967-019-0003-1
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DOI: https://doi.org/10.1007/s42967-019-0003-1
Keywords
- Kirchhoff plate
- \(C^0\) discontinuous Galerkin
- Two-level additive Schwarz preconditioner
- Intergrid transfer operator