Real-Space Renormalization Estimates for Two-Phase Flow in Porous Media

Alex Hansen, Stéphane Roux, Amnon Aharony, Jens Feder, Torstein Jøssang, H. H. Hardy

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

We present a spatial renormalization group algorithm to handle immiscible two-phase flow in heterogeneous porous media. We call this algorithm FRACTAM-R, where FRACTAM is an acronym for Fast Renormalization Algorithm for Correlated Transport in Anisotropic Media, and the R stands for relative permeability. Originally, FRACTAM was an approximate iterative process that replaces the L x L lattice of grid blocks, representing the reservoir, by a (L/2) x (L/2) one. In fact, FRACTAM replaces the original L x L lattice by a hierarchical (fractal) lattice, in such a way that finding the solution of the two-phase flow equations becomes trivial. This triviality translates in practice into computer efficiency. For N = L x L grid blocks we find that the computer time necessary to calculate fractional flow F(t) and pressure P(t) as a function of time scales as τ ∼ N1.7 for FRACTAM-R. This should be contrasted with the computational time of a conventional grid simulator τ ∼ N2.3. The solution we find in this way is an acurate approximation to the direct solution of the original problem.

Original languageEnglish
Pages (from-to)247-279
Number of pages33
JournalTransport in Porous Media
Volume29
Issue number3
DOIs
StatePublished - 1 Jan 1997
Externally publishedYes

Keywords

  • Effective properties
  • Heterogeneity
  • Relative permeability
  • Renormalization numerical algorithm
  • Simulation

ASJC Scopus subject areas

  • Catalysis
  • Chemical Engineering (all)

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