The Fluid–Shell Interaction Interface
Using the Fluid–Shell Interaction () interface, you can model phenomena where a fluid and a deformable shell 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–Shell Interaction interface models bidirectional coupling between solids and fluids.
You add a predefined Fluid–Shell 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 Shell 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 Shell interface is described in The Shell and Plate Interfaces.
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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 Shell 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.
Physics Interfaces and Coupling Features
Coupling Features
The Fluid–Structure Interaction coupling feature is used to couple the interfaces.
Physics Interface Features
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The available physics features for The Single-Phase Flow, Laminar Flow Interface are listed in the section Domain, Boundary, Pair, and Point Nodes for Single-Phase Flow in the COMSOL Multiphysics Reference Manual.
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The available physics features for The Shell and Plate Interfaces are listed in the Domain, Boundary, Edge, Point, and Pair Nodes for the Shell and Plate Interfaces section.