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Non-Newtonian fluid flow in geological rough fractures: lubrication approximation versus direct 3D simulations

Alessandro Lenci 1 Yves Méheust 2 Vittorio Di Frederico 1
1 University of Bologna
2 GR - Géosciences Rennes
Abstract : We simulate non-Newtonian flow in rough fractures. Random aperture fields with isotropic spatial correlations are generated using an FFT-based algorithm. We first solve the flow with a finite-difference code based on the lubrication approximation for power law and Carreau rheologies (2D approach). We then solve a modified Navier-Stokes equation incorporating both rheologies, in the 3D fracture space (3D approach). The 2D approach's efficiency to predict the flow distribution in the fracture plane depends on the fracture closure and correlation length.
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Conference papers
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https://hal-insu.archives-ouvertes.fr/insu-03079016
Contributor : Isabelle Dubigeon Connect in order to contact the contributor
Submitted on : Thursday, December 17, 2020 - 8:54:41 AM
Last modification on : Wednesday, November 3, 2021 - 5:17:52 AM

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  • HAL Id : insu-03079016, version 1

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Alessandro Lenci, Yves Méheust, Vittorio Di Frederico. Non-Newtonian fluid flow in geological rough fractures: lubrication approximation versus direct 3D simulations. XXIII Computational Methods in Water Resources, Dec 2020, Stanford, United States. ⟨insu-03079016⟩

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