The Acoustic-Poroelastic Waves Interaction Interface
The Acoustic-Poroelastic Waves Interaction multiphysics interface () combines Pressure Acoustics, Frequency Domain and Poroelastic Waves together with the Acoustic-Porous Boundary multiphysics coupling.
When a predefined Acoustic-Poroelastic Waves Interaction interface is added from the Acoustics>Acoustic-Structure Interaction branch () of the Model Wizard or the Add Physics windows, the Poroelastic Waves and Pressure Acoustics, Frequency Domain interfaces are added to the Model Builder.
In addition, the Multiphysics Couplings node is added, which automatically includes the Acoustic-Porous Boundary multiphysics coupling.
See The Multiphysics Branch and Multiphysics Modeling Workflow in the COMSOL Multiphysics Reference Manual.
Settings for Physics Interfaces and Multiphysics Couplings
When the predefined multiphysics interface is used, for example Acoustic-Poroelastic Waves Interaction, the Selection on the multiphysics coupling is automatically set to All boundaries. In this way the multiphysics coupling is automatically active on all boundaries with Pressure Acoustics, Frequency Domain on one side and Poroelastic Waves on the other.
However, if physics interfaces are added one at a time, followed by the multiphysics coupling, these modified settings are not automatically included.
For example, if single Poroelastic Waves and Pressure Acoustics, Frequency Domain interfaces are added, COMSOL Multiphysics adds an empty Multiphysics Couplings node. You can choose the available multiphysics couplings, but you need manually to select on which boundaries they need to be applied, or select All boundaries to recover the predefined behavior
Multiphysics couplings are available from the context menu (right-click the Multiphysics Couplings node) or from the Physics toolbar, Multiphysics menu.
Physics Interfaces and Multiphysics Couplings
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.
Multiphysics Coupling
The Acoustic-Porous Boundary multiphysics coupling is described in the Multiphysics Couplings chapter.
Physics Interface Features
Physics nodes are available from the Physics ribbon toolbar (Windows users), Physics context menu (Mac 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 Poroelastic Waves Interface are listed in the section Domain, Boundary, and Pair Nodes for the Poroelastic Waves Interfaces.
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The available physics features for The Pressure Acoustics, Frequency Domain Interface are listed in the section Domain, Boundary, Edge, Point, and Pair Nodes for the Pressure Acoustics, Frequency Domain Interface.