# A Multiscale Model Reduction Method for Partial Differential Equations

Maolin Ci; Thomas Y. Hou; Zuoqiang Shi

- Volume: 48, Issue: 2, page 449-474
- ISSN: 0764-583X

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topCi, Maolin, Hou, Thomas Y., and Shi, Zuoqiang. "A Multiscale Model Reduction Method for Partial Differential Equations." ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique 48.2 (2014): 449-474. <http://eudml.org/doc/273347>.

@article{Ci2014,

abstract = {We propose a multiscale model reduction method for partial differential equations. The main purpose of this method is to derive an effective equation for multiscale problems without scale separation. An essential ingredient of our method is to decompose the harmonic coordinates into a smooth part and a highly oscillatory part so that the smooth part is invertible and the highly oscillatory part is small. Such a decomposition plays a key role in our construction of the effective equation. We show that the solution to the effective equation is in H2, and can be approximated by a regular coarse mesh. When the multiscale problem has scale separation and a periodic structure, our method recovers the traditional homogenized equation. Furthermore, we provide error analysis for our method and show that the solution to the effective equation is close to the original multiscale solution in the H1 norm. Numerical results are presented to demonstrate the accuracy and robustness of the proposed method for several multiscale problems without scale separation, including a problem with a high contrast coefficient.},

author = {Ci, Maolin, Hou, Thomas Y., Shi, Zuoqiang},

journal = {ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique},

keywords = {model reduction; effective equation; multiscale PDE; harmonic coordinates; decomposition; convection-diffusion equation},

language = {eng},

number = {2},

pages = {449-474},

publisher = {EDP-Sciences},

title = {A Multiscale Model Reduction Method for Partial Differential Equations},

url = {http://eudml.org/doc/273347},

volume = {48},

year = {2014},

}

TY - JOUR

AU - Ci, Maolin

AU - Hou, Thomas Y.

AU - Shi, Zuoqiang

TI - A Multiscale Model Reduction Method for Partial Differential Equations

JO - ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique

PY - 2014

PB - EDP-Sciences

VL - 48

IS - 2

SP - 449

EP - 474

AB - We propose a multiscale model reduction method for partial differential equations. The main purpose of this method is to derive an effective equation for multiscale problems without scale separation. An essential ingredient of our method is to decompose the harmonic coordinates into a smooth part and a highly oscillatory part so that the smooth part is invertible and the highly oscillatory part is small. Such a decomposition plays a key role in our construction of the effective equation. We show that the solution to the effective equation is in H2, and can be approximated by a regular coarse mesh. When the multiscale problem has scale separation and a periodic structure, our method recovers the traditional homogenized equation. Furthermore, we provide error analysis for our method and show that the solution to the effective equation is close to the original multiscale solution in the H1 norm. Numerical results are presented to demonstrate the accuracy and robustness of the proposed method for several multiscale problems without scale separation, including a problem with a high contrast coefficient.

LA - eng

KW - model reduction; effective equation; multiscale PDE; harmonic coordinates; decomposition; convection-diffusion equation

UR - http://eudml.org/doc/273347

ER -

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