Parallel Plates Permeability Model
The parallel plates permeability model defines the relationship between the hydraulic fracture aperture and its corresponding permeability following the classic lubrication model (Witherspoon et al. ) . In this model, the two fracture walls are assumed to be smooth and parallel to each other and separated by a uniform aperture.
where denotes the hydraulic fracture aperture.
Remark: , dimensionally, is not a permeability (as it is expressed in ).
The Parallel Plates Permeability Model can be called in the
<Constitutive> block of the input XML file.
This permeability model must be assigned a unique name via the
This name is used to assign the model to regions of the physical
domain via a
materialList attribute in the
The following attributes are supported:
A name is required for any non-unique nodes
Default value of the permeability normal to the surface. If not specified the permeability is updated using the cubic law.