Beam Rotor–Bearing Coupling
The Beam Rotor–Bearing Coupling () transfers the velocity and displacement information of the journal from the Beam Rotor interface to the Hydrodynamic Bearing interface and at the same time applies the pressure on the fluid film from the Hydrodynamic Bearing interface as an external load in the Beam Rotor interface.
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 brbc.
Boundary Selection
When nodes are added from the context menu, all the boundaries selected in the Hydrodynamic Bearing interfaces are selected by default. You can optionally remove the unwanted boundaries from the selection.
Coupled Interfaces
This section defines the physics involved in the multiphysics coupling. The Rotor and Bearing lists include all applicable physics interfaces.
The default values depend on how the coupling node is created.
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If the node is added from the Physics ribbon (Windows users), Physics contextual toolbar (Mac 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 the node added automatically when a multiphysics interface is selected 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 Beam Rotor–Bearing Coupling node from a physics interface. If one of the participating physics interfaces is removed from the Model Builder, the corresponding entry is set 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 Rotor or Bearing lists. This is applicable to all multiphysics coupling nodes that would normally default to the once- present interface. See Multiphysics Modeling Workflow in the COMSOL Multiphysics Reference Manual.