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Flow through three-dimensional self-affine fractures

H. J. Seybold1,2, H. A. Carmona1, F. A. Leandro Filho1, A. D. Araújo1, F. Nepomuceno Filho1, and J. S. Andrade, Jr.1,*

  • 1Departamento de Física, Universidade Federal do Ceará, Campus do Pici, 60451-970 Fortaleza, Ceará, Brazil
  • 2Physics of Environmental Systems, D-USYS, ETH, Zurich, 8093 Zurich, Switzerland

  • *soares@fisica.ufc.br
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Phys. Rev. Fluids 5, 104101 – Published 9 October, 2020

DOI: https://doi.org/10.1103/PhysRevFluids.5.104101

Abstract

We investigate through numerical simulations of the Navier-Stokes equations the influence of the surface roughness on the fluid flow through fracture joints. Using the Hurst exponent H to characterize the roughness of the self-affine surfaces that constitute the fracture, our analysis reveals the important interplay between geometry and inertia on the flow. Precisely, for low values of Reynolds numbers, Re, we use Darcy's law to quantify the hydraulic resistance G of the fracture and show that its dependence on H can be explained in terms of a simple geometrical model for the geometric tortuosity τ of the channel. At sufficiently high values of Re, when inertial effects become relevant, our results reveal that nonlinear corrections up to third order to Darcy's law are approximately proportional to H. These results imply that the resistance G to the flow follows a universal behavior by simply rescaling it in terms of the fracture resistivity and using an effective Reynolds number, namely, Re/H. Our results also reveal the presence of quasi-one-dimensional channeling, even considering the absence of shear displacement between upper and lower surfaces of the self-affine fracture.

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Information

Phys. Rev. Fluids 5, 104101– Published 9 October, 2020
  • Received 8 June 2020
  • Accepted 11 September 2020
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