Subsurface Flow Module Updates
For users of the Subsurface Flow Module, COMSOL Multiphysics ® version 5.2a brings a new Poroelasticityinterface, Gravity feature, and Flownet plot type. Review all of the Subsurface Flow Module updates in detail below.
New Poroelasticity Interface
There is a new Poroelasticity multiphysics coupling between Solid Mechanics and Darcy's Law . When adding aPoroelasticity interface in COMSOL Multiphysics ® version 5.2a, these two separate physics interfaces and the multiphysics coupling, as a series of nodes, are created. This gives you access to all functionality available in the constituent interfaces. As an example, you can now model poroplasticity by adding a Soil Plasticity node in the Solid Mechanics interface.
Application Library path for an example that uses the new Poroelasticity interface:Subsurface_Flow_Module/Flow_and_Solid_Deformation/multilateral_well
Stress distribution in a poroelastic analysis, from the Application Library's Failure of a Multilateral Well tutorial model.
NOTE: In order to model poroelastic behavior, use the Subsurface Flow Module or a combination of the Structural Mechanics Module and a fluid flow add-on module that supports the Darcy's Law interface.
A Gravity feature is now available for the Darcy's Law , Richards' Equation , and Fracture Flow interfaces. A volume force equal to is added on all domains where the fluid flow interface is active and a Gravity feature appears in the model tree.
Two formulations are available to specify Darcy's velocity field under gravity: Acceleration of gravity (default), and Elevation .
New Flownet Plot
The Richards' Equation interface in 2D and 2D axisymmetric geometries now generates a Flownet 2D plot group by default. This plot combines a streamline plot for Darcy's velocity field and a contour plot for the pressure head variable.
Application Library path for an example that uses the new Flownet plot type:Subsurface_Flow_Module/Solute_Transport/pesticide_transport
The Richards' Equation interface showing the new Flownet plot group. Note the combined contour and streamline plots.