Abstract
We propose an arbitrary-order discontinuous Galerkin method for second-order elliptic problem on general polygonal mesh with only one degree of freedom per element. This is achieved by locally solving a discrete least-squares over a neighboring element patch. Under a geometrical condition on the element patch, we prove an optimal a priori error estimates in the energy norm and in the \(\hbox {L}^2\) norm. The accuracy and the efficiency of the method up to order six on several polygonal meshes are illustrated by a set of benchmark problems.
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Acknowledgements
The authors would like to thank Dr. Fengyang Tang for his help in the earlier stage of the present work, and the authors would like to thank the anonymous referees for the constructive comments that improve the paper. Funding was provided by National Natural Science Foundation of China (Grant Nos. 11425106, 91630313, 91630313, 11671312)
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Li, R., Ming, P., Sun, Z. et al. An Arbitrary-Order Discontinuous Galerkin Method with One Unknown Per Element. J Sci Comput 80, 268–288 (2019). https://doi.org/10.1007/s10915-019-00937-y
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DOI: https://doi.org/10.1007/s10915-019-00937-y