Physics – Fluid Dynamics
Scientific paper
2006-03-08
geothermics 35 (2006) 576 - 588
Physics
Fluid Dynamics
Scientific paper
10.1016/j.geothermics.2006.11.00
The effect on the transport properties of fractures of a relative shear displacement $\vec u$ of rough walls with complementary self-affine surfaces has been studied experimentally and numerically. The shear displacement $\vec u$ induces an anisotropy of the aperture field with a correlation length scaling as $u$ and significantly larger in the direction perpendicular to $\vec u$. This reflects the appearance of long range channels perpendicular to $\vec u$ resulting in a higher effective permeability for flow in the direction perpendicular to the shear. Miscible displacements fronts in such fractures are observed experimentally to display a self affine geometry of characteristic exponent directly related to that of the rough wall surfaces. A simple model based on the channelization of the aperture field allows to reproduces the front geometry when the mean flow is parallel to the channels created by the shear displacement.
Auradou Harold
Boschan Alexandro
Drazer German
Hulin Jean-Pierre
Koplik Joel
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