Heterogeneities of flow in stochastically generated porous media

Jeffrey D. Hyman, Piotr K. Smolarkiewicz, C. Larrabee Winter

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

Heterogeneous flows are observed to result from variations in the geometry and topology of pore structures within stochastically generated three dimensional porous media. A stochastic procedure generates media comprising complex networks of connected pores. Inside each pore space, the Navier-Stokes equations are numerically integrated until steady state velocity and pressure fields are attained. The intricate pore structures exert spatially variable resistance on the fluid, and resulting velocity fields have a wide range of magnitudes and directions. Spatially nonuniform fluid fluxes are observed, resulting in principal pathways of flow through the media. In some realizations, up to 25% of the flux occurs in 5% of the pore space depending on porosity. The degree of heterogeneity in the flow is quantified over a range of porosities by tracking particle trajectories and calculating their attributes including tortuosity, length, and first passage time. A representative elementary volume is first computed so the dependence of particle based attributes on the size of the domain through which they are followed is minimal. High correlations between the dimensionless quantities of porosity and tortuosity are calculated and a logarithmic relationship is proposed. As the porosity of a medium increases the flow field becomes more uniform.

Original languageEnglish (US)
Article number056701
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume86
Issue number5
DOIs
StatePublished - Nov 2 2012

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Heterogeneities of flow in stochastically generated porous media'. Together they form a unique fingerprint.

  • Cite this