Contrast-Independent, Partially-Explicit Time Discretizations for Nonlinear Multiscale Problems

Eric T. Chung, Yalchin Efendiev, Wing Tat Leung and Wenyuan Li
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Eric T. Chung: Department of Mathematics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
Yalchin Efendiev: Department of Mathematics, Institute for Scientific Computation (ISC), Texas A&M University, College Station, TX 77845, USA
Wing Tat Leung: Department of Mathematics, University of California, Irvine, CA 92697, USA
Wenyuan Li: Department of Mathematics, Institute for Scientific Computation (ISC), Texas A&M University, College Station, TX 77845, USA

Mathematics, 2021, vol. 9, issue 23, 1-24

Abstract: This work continues a line of work on developing partially explicit methods for multiscale problems. In our previous works, we considered linear multiscale problems where the spatial heterogeneities are at the subgrid level and are not resolved. In these works, we have introduced contrast-independent, partially explicit time discretizations for linear equations. The contrast-independent, partially explicit time discretization divides the spatial space into two components: contrast dependent (fast) and contrast independent (slow) spaces defined via multiscale space decomposition. Following this decomposition, temporal splitting was proposed, which treats fast components implicitly and slow components explicitly. The space decomposition and temporal splitting are chosen such that they guarantees stability, and we formulated a condition for the time stepping. This condition was formulated as a condition on slow spaces. In this paper, we extend this approach to nonlinear problems. We propose a splitting approach and derive a condition that guarantees stability. This condition requires some type of contrast-independent spaces for slow components of the solution. We present numerical results and show that the proposed methods provide results similar to implicit methods with a time step that is independent of the contrast.

Keywords: multiscale method; GMsFEM; splitting; nonlinear reaction; CEM-GMsFEM; explicit–implicit (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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