The Fluid–Membrane Interaction Interface
Using the Fluid–Membrane Interaction () interface, you can model phenomena where a fluid and a deformable membrane affect each other. The interface includes a predefined condition for the interaction at the fluid–solid boundaries. Arbitrary Lagrangian–Eulerian Formulation (ALE) is used for incorporating the geometrical changes of the fluid domain.
Using a stationary or a time-dependent study, the Fluid–Membrane Interaction interface models bidirectional coupling between solids and fluids.
You add a predefined Fluid–Membrane Interaction interface from the Fluid–Structure Interaction () group in either the Structural Mechanics branch () or the Fluid Flow branch () of the Model Wizard or Add Physics windows. Laminar Flow and Membrane interfaces are then added to the Model Builder.
In addition, the Multiphysics node is added, which automatically includes the multiphysics coupling feature Fluid–Structure Interaction.
At the same time, a Moving Mesh node with a Deforming Domain subnode is created under Definitions. For more information, see Deforming Fluid Domains.
On the Constituent Physics Interfaces
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The Laminar Flow interface is described in The Single-Phase Flow, Laminar Flow Interface. When the CFD Module is available, turbulent flow is supported through the inclusion of a number of turbulence models.
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The Membrane interface is described in The Membrane Interface.
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The Deforming Domain feature is described in the Moving Mesh Features.
Settings for Physics Interfaces and Coupling Features
When physics interfaces are added using the predefined couplings, all specific settings are included with the physics interfaces and the coupling features.
However, if physics interfaces are added one at a time, followed by the coupling features, these modified settings are not automatically included.
For example, if single Laminar Flow and Membrane interfaces are added, COMSOL Multiphysics adds an empty Multiphysics node. You can choose from the available coupling features, but the modified settings are not included.
Coupling Features
The Fluid–Structure Interaction coupling feature is used to couple the interfaces.