Mixed Multiscale Finite Element Methods on Adaptive Unstructured Grids Using Limited Global Information

J. E. Aarnes*, Y. Efendiev, T. Y. Hou, L. Jiang

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

Abstract

We study mixed multiscale finite element methods (MsFEM) on unstructured coarse grids. Unstructured grids are often used when highly heterogeneous reservoirs are discretized via irregular anisotropic fine grids. Our study is motivated by the development of coarse-scale models for coupled flow and transport equations in a multi-phase system. An unstructured coarse grid is often used to upscale the transport equation with hyperbolic nature in a highly heterogeneous reservoir. Solving the flow equation on the same coarse grid provides a general robust coarse-scale model for the multiphase flow and transport at a low CPU cost. We present numerical results when both the flow and transport equations are solved on the coarse grid. Numerical examples involve highly channelized permeability as well as a 3- D reservoir model using an unstructured fine grid. In all examples, we show that our approach can provide an accurate approximation of the resolved solution at a much lower cost. We also study the convergence of the mixed multiscale finite element method on unstructured coarse grids.

Original languageEnglish (US)
Title of host publicationMultiscale Methods
Subtitle of host publicationBridging the Scales in Science and Engineering
PublisherOxford University Press
Volume9780199233854
ISBN (Electronic)9780191715532
ISBN (Print)9780199233854
DOIs
StatePublished - Oct 1 2009

Keywords

  • Mixed finite element method
  • Multiscale
  • Porous media
  • Two-phase flow
  • Unstructured grid
  • Upscaling

ASJC Scopus subject areas

  • Mathematics(all)

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