The Solid Thin-Film Damping Interface
The Solid Thin-Film Damping () interface can be used to model phenomena where a thin-film fluid and a deformable solid affect each other. The fluid can be either a liquid or a gas, with the possibility to include cavitation in liquids.
Use the Solid Thin-Film Damping interface to apply boundary loads to the surface of a resonator that result from squeeze-film or slide-film damping. Examples of common situations in which these types of damping are appropriate are parallel-plate capacitive and comb-drive actuators for squeeze-film and slide-film damping, respectively.
You add a predefined Solid Thin-Film Damping interface from the Fluid-Structure Interaction () group in the Structural Mechanics branch () of the Model Wizard or Add Physics windows. Solid Mechanics and Thin-Film Flow interfaces are then added to the Model Builder.
In addition, the Multiphysics node is added, which automatically includes the multiphysics coupling feature Structure Thin-Film Flow Interaction.
On the Constituent Physics Interfaces
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The Solid Mechanics interface is described in The Solid Mechanics Interface
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The Thin-Film Flow interface is described in The Thin-Film Flow Interfaces.
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 Thin-Film Flow and Solid Mechanics 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 are available from the context menu (right-click the Multiphysics node) or from the Physics toolbar, Multiphysics Couplings menu.
Physics Interfaces and Coupling Features
Use the online help in COMSOL Multiphysics to locate and search all the documentation. All these links also work directly in COMSOL Multiphysics when using the Help system.
Coupling Features
The Structure Thin-Film Flow Interaction coupling feature is used to couple the interfaces.
Physics Interface Features
Physics nodes are available from the Physics ribbon toolbar (Windows users), Physics context menu (macOS or Linux users), or right-click to access the context menu (all users).
In general, to add a node, go to the Physics toolbar, no matter what operating system you are using. Subnodes are available by clicking the parent node and selecting it from the Attributes menu.
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The available physics features for The Solid Mechanics Interface are listed in the Domain, Boundary, Edge, Point, and Pair Nodes for Solid Mechanics section.
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The available physics features for The Thin-Film Flow Interfaces are listed in the Domain, Boundary, Edge, Point, and Pair Nodes for the Thin-Film Flow Interfaces section in the CFD Module User’s Guide.
See Theory for the Thin-Film Flow Interfaces in the CFD Module User’s Guide.