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https://hdl.handle.net/2440/136919
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Type: | Journal article |
Title: | Adaptively Detect and Accurately Resolve Macro-scale Shocks in an Efficient Equation-Free Multiscale Simulation |
Author: | Maclean, J. Bunder, J.E. Kevrekidis, I.G. Roberts, A.J. |
Citation: | SIAM Journal on Scientific Computing, 2022; 44(4):A2557-A2581 |
Publisher: | Society for Industrial & Applied Mathematics (SIAM) |
Issue Date: | 2022 |
ISSN: | 1064-8275 1095-7197 |
Statement of Responsibility: | John Maclean, J. E. Bunder, I. G. Kevrekidis, and A. J. Roberts |
Abstract: | The equation-free approach to efficient multiscale numerical computation marries trusted micro-scale simulations to a framework for numerical macro-scale reduction---the patch dynamics scheme. A recent novel patch scheme empowered the equation-free approach to simulate systems containing shocks on the macro-scale. However, the scheme did not predict the formation of shocks accurately, and it could not simulate moving shocks. This article resolves both issues, as a first step in one spatial dimension, by embedding the equation-free, shock-resolving patch scheme within a classic framework for adaptive moving meshes. Our canonical micro-scale problems exhibit heterogeneous nonlinear advection and heterogeneous diffusion. We demonstrate many remarkable benefits from the moving patch scheme, including efficient and accurate macro-scale prediction despite the unknown macro-scale closure. Equation-free methods are here extended to simulate moving, forming, and merging shocks without a priori knowledge of the existence or closure of the shocks. Whereas adaptive moving mesh equations are typically stiff, typically requiring small time-steps on the macro-scale, the moving macro-scale mesh of patches is typically not stiff given the context of the micro-scale time-steps required for the subpatch dynamics. |
Keywords: | equation-free; multiscale simulation; shock-resolving; materials modeling |
Rights: | © 2022 Society for Industrial and Applied Mathematics |
DOI: | 10.1137/21m1437172 |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.1137/21m1437172 |
Appears in Collections: | Mathematical Sciences publications |
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