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An Online Generalized Multiscale Discontinuous Galerkin Method (GMsDGM) for Flows in Heterogeneous Media

Published online by Cambridge University Press:  07 February 2017

Eric T. Chung*
Affiliation:
Department of Mathematics, The Chinese University of Hong Kong, Hong Kong
Yalchin Efendiev*
Affiliation:
Department of Mathematics, Texas A&M University, College Station, TX 77843-3368, USANumerical Porous Media SRI Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
Wing Tat Leung*
Affiliation:
Department of Mathematics, Texas A&M University, College Station, TX 77843-3368, USA
*
*Corresponding author.Email addresses:tschung@math.cuhk.edu.hk (E. T. Chung), efendiev@math.tamu.edu (Y. Efendiev), leungwt@math.tamu.edu (W. T. Leung)
*Corresponding author.Email addresses:tschung@math.cuhk.edu.hk (E. T. Chung), efendiev@math.tamu.edu (Y. Efendiev), leungwt@math.tamu.edu (W. T. Leung)
*Corresponding author.Email addresses:tschung@math.cuhk.edu.hk (E. T. Chung), efendiev@math.tamu.edu (Y. Efendiev), leungwt@math.tamu.edu (W. T. Leung)

Abstract

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Offline computation is an essential component in most multiscale model reduction techniques. However, there are multiscale problems in which offline procedure is insufficient to give accurate representations of solutions, due to the fact that offline computations are typically performed locally and global information is missing in these offline information. To tackle this difficulty, we develop an online local adaptivity technique for local multiscale model reduction problems. We design new online basis functions within Discontinuous Galerkin method based on local residuals and some optimally estimates. The resulting basis functions are able to capture the solution efficiently and accurately, and are added to the approximation iteratively. Moreover, we show that the iterative procedure is convergent with a rate independent of physical scales if the initial space is chosen carefully. Our analysis also gives a guideline on how to choose the initial space. We present some numerical examples to show the performance of the proposed method.

Information

Type
Research Article
Copyright
Copyright © Global-Science Press 2017