Electromechanics, Boundary
Use an Electromechanics, Boundary () coupling to model electromechanical interaction between deformable shells or membranes and electric fields, particularly in case when the deformations of the thin structure can significantly affect the electric field distribution.
The presence of such multiphysics node in the model will enforce the Include geometric nonlinearity option on all applicable study nodes.
Settings
The Label is the default multiphysics coupling feature name.
The Name is used primarily as a scope prefix for variables defined by the coupling node. Refer to such variables in expressions using the pattern <name>.<variable_name>. In order to distinguish between variables belonging to different coupling nodes or physics interfaces, the name string must be unique. Only letters, numbers, and underscores (_) are permitted in the Name field. The first character must be a letter.
The default Name (for the first multiphysics coupling feature in the model) is emfb1.
Domain Selection
All applicable domains are selected automatically. Such domains represent an intersection of the applicable domains under the corresponding Electrostatics and Shell or Membrane interfaces selected in the coupling feature.
Coupled interfaces
This section defines the physics interfaces involved in this multiphysics coupling. The Thin structure and Electrostatics lists include all applicable physics interfaces.
The default values depend on how the coupling node is created.
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If it is added from the Physics ribbon (Windows users), Physics contextual toolbar (macOS and Linux users), or context menu (all users), then the first physics interface of each type in the component is selected as the default.
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If it is added automatically when the physics interface is chosen in the Model Wizard or Add Physics window, then the two participating physics interfaces are selected.
You can also select None from either list to uncouple the coupling from a physics interface. If the physics interface is removed from the Model Builder, for example Membrane is deleted, then the Thin structure list defaults to None as there is nothing to couple to.
If a physics interface is deleted and then added to the model again, then in order to reestablish the coupling, you need to choose the physics interface again from the lists. This is applicable to all multiphysics coupling nodes that would normally default to the once present physics interface. See Multiphysics Modeling Workflow in the COMSOL Multiphysics Reference Manual.