Viscous backflow from a model fracture network: Influence of a permeable boundary

Asaf Dana, Gunnar G. Peng, Howard A. Stone, Herbert E. Huppert, Guy Z. Ramon

Research output: Contribution to journalArticlepeer-review

Abstract

The leakage from a fracture network to a surrounding medium during drainage, or backflow, driven by elastic relaxation, is considered. A network model is extended to include the effects of permeable boundaries, with the permeation through the wall assumed to be proportional to the local pressure. The regimes in which leakage is dominant relative to the parallel flow along the channel are evaluated at different times. Results show that, when the aperture of the channel is large enough, the parallel flow is greater than the permeation through the wall, and the channel thickness decreases in time, with a behaviour, as reported previously. However, when the aperture is small, the channel thickness decreases exponentially in time. An asymptotic investigation of the solution for a single fracture is performed and extended to network systems. The study provides insight into the influence leakage may have on squeezing-induced flows, which is relevant to natural and engineering systems.

Original languageEnglish (US)
Article numberA42
JournalJournal of Fluid Mechanics
Volume911
DOIs
StatePublished - 2021

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • lubrication theory
  • porous media

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