Fracture
This feature is only available in a limited set of add-on products. See http://www.comsol.com/products/specifications/ for more details on availability.
Use this node to model mass transport along thin fractures in porous media. The node assumes that the transport in the tangential direction along the fracture is dominant, as a result of lower flow resistance.
Fracture Properties
Specify a value for the Fracture thickness dfr.
Porous Material
Select an option from the Porous material list. The default is Domain material.
By default the Porosity, εp (dimensionless) is taken From material. Select User defined to enter a different value or expression.
Convection
Select an option from the Velocity field list to specify the convective velocity along the fracture. For a consistent model, use a Fracture Flow feature in a Darcy’s Law interface to compute the fluid flow velocity in the fracture.
For User defined, enter values or expressions for the velocity components in the table shown.
The settings for the Diffusion, and Dispersion sections are the same as for Porous Media Transport Properties.