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A test case for the simulation of three-dimensional variable-density flow and solute transport in discretely-fractured porous media
Authors:Thomas Graf  René Therrien
Institution:1. Center of Geosciences, Georg-August-University Göttingen, Goldschmidtstraße 3, 37077 Göttingen, Germany;2. Département de Géologie et Génie Géologique, Université Laval. Ste-Foy, Québec G1K 7P4, Canada
Abstract:A test case has been developed for three-dimensional simulations of variable-density flow and solute transport in discretely-fractured porous media. The simulation domain is a low-permeability porous matrix cube containing a single non-planar fracture. The initial solute concentration is zero everywhere. A constant solute concentration is assigned to the top of the domain, which increases near-top fluid density and induces downward density-driven flow. The test case is therefore comparable to downwelling of a dense brine below a saline disposal basin or a waste repository. Numerous fingers and distinct convection cells develop early in the fracture but the fingers later coalesce and convection becomes less apparent. To help test other variable-density flow and transport models, results of the test case are presented both qualitatively (concentration contours and velocity fields) and quantitatively (penetration depth, mass flux, total mass stored, maximum fracture and matrix velocity).
Keywords:Test case  3D  Density  Fracture  Numerical model
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