Journal
IMA JOURNAL OF NUMERICAL ANALYSIS
Volume 39, Issue 2, Pages 760-791Publisher
OXFORD UNIV PRESS
DOI: 10.1093/imanum/dry012
Keywords
DG method; Schrodinger equation; numerical flux; global projection; superconvergence
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Funding
- National Science Foundation [DMS-1312636]
- National Science Foundation Research Network [RNMS11-07291(KI-Net)]
- National Natural Science Foundation of China (NSFC) [91430213]
- Hunan Provincial National Science Foundation Project [2016JJ6042, 2015JJ2145]
- National Natural Science Foundation of China (NSFC) Tian Yuan Fund [11626098]
- NSFC Project [11671341]
- Hunan Education Department Project [16A206]
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In this paper, we present two approaches to the error analysis of a semidiscrete mass-preserving discontinuous Galerkin method, introduced by Lu, Huang and Liu (2015, Mass preserving direct discontinuous Galerkin methods for Schrodinger equations. J. Comp. Phys., 282, 210-226), for the solution of multi-dimensional Schrodinger equations. The first approach is based on an explicit global projection using tensor product polynomials on rectangular meshes. The L-2 error bound obtained is optimal, independent of the size of the flux parameter. The second approach is based on an implicit global projection using standard polynomials on arbitrary shape-regular meshes. The L-2 error bound obtained for this method is also optimal, but it is valid only when the flux parameter is sufficiently large. Numerical experiments are presented to demonstrate the theoretical results.
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