The Solid Rotor with Hydrodynamic Bearing Interface
The Solid Rotor with Hydrodynamic Bearing interface () combines a Solid Rotor interface with a Hydrodynamic Bearing interface. The coupling occurs on the boundary level, where the displacement and velocity from the Solid Rotor interface governs the fluid-film thickness in the Hydrodynamic Bearing interface, and the pressure distribution on the journal surface from the Hydrodynamic Bearing interface acts as an external load on the Solid Rotor interface.
When a predefined Solid Rotor with Hydrodynamic Bearing interface is added from the Structural Mechanics > Rotordynamics branch () of the Model Wizard or Add Physics windows, Solid Rotor and Hydrodynamic Bearing interfaces are added to the Model Builder.
In addition, the Multiphysics node is added, which automatically includes the multiphysics coupling feature Solid Rotor–Bearing Coupling.
On the Constituent Physics Interfaces
The Solid Rotor interface is intended for general rotordynamics analysis of rotors modeled using 3D geometries. The Solid Rotor interface is based on solving Navier’s equations. The interface also includes the effect of the frame acceleration due to rotation and computes results such as displacements, stresses, and strains.
The Hydrodynamic Bearing interface provides features for modeling the flow in thin fluid films such as Journal Bearings. A Hydrodynamic Journal Bearing model is active by default on all boundaries. You should select only those boundaries that correspond to the bearing. The pressure equation used in the fluid film is the Reynolds equation.
Settings for Physics Interfaces and Coupling Features
When physics interfaces are added using the predefined couplings, 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 Solid Rotor and Hydrodynamic Bearing interfaces are added, an empty Multiphysics node appears in the model tree. You can choose from the available coupling features, but the settings in the constituent interfaces are not modified.
Coupling features are available from the context menu (right-click the Multiphysics node) or from the Physics toolbar, Multiphysics menu.
Physics Interfaces and Coupling Features
Coupling Features
The Solid Rotor–Bearing Coupling node is described in this section.