Overview of the User’s Guide
The Rotordynamics Module User’s Guide gets you started with modeling rotordynamics applications using COMSOL Multiphysics. The information in this guide is specific to this module. Instructions on how to use COMSOL Multiphysics in general are included in the COMSOL Multiphysics Reference Manual.
As detailed in the section Where Do I Access the Documentation and Application Libraries?, this information can also be searched from the COMSOL Multiphysics software Help menu.
Modeling with Rotordynamics module
The Rotordynamics Modeling chapter gives you insight into how to approach modeling various rotordynamics problems.
Rotordynamics Theory
The Rotordynamics Theory chapter outlines the theory for the various interfaces present in the Rotordynamics Module.
The Solid Rotor Interface
The Solid Rotor chapter describes The Solid Rotor Interface and all the available feature nodes. Nodes which are unique to the Solid Rotor interface are described in detail. The rest of the feature nodes are described in the Structural Mechanics Module User’s Guide.
The Solid Rotor, Fixed Frame Interface
The Solid Rotor, Fixed Frame chapter describes The Solid Rotor, Fixed Frame Interface and all the available feature nodes. This interface shares all the nodes with Solid Rotor interface. Thus, the details of all the nodes are given in the Solid Rotor chapter.
The Beam Rotor Interface
The Beam Rotor chapter describes the Beam Rotor interface, which uses Timoshenko beam theory for modeling the rotor. This chapter also describes the underlying theory for the physics interface and the available feature nodes in The Beam Rotor Interface. The Bearings and Foundation nodes are described in the Solid Rotor chapter. The rest of the feature nodes are described in the Structural Mechanics Module User’s Guide.
The Hydrodynamic Bearing Interface
The Hydrodynamic Bearing chapter describes the Hydrodynamic Bearing interface and all the available feature nodes. The Hydrodynamic Journal Bearing, Hydrodynamic Thrust Bearing, Floating Ring Bearing and Squeeze-Film Damper features and Bearing Types are therein described in detail.
Multiphysics Interfaces and Couplings
The Multiphysics Interfaces and Couplings chapter describes two multiphysics interfaces found under the Rotordynamics branch when adding a physics interface:
•
The Solid Rotor with Hydrodynamic Bearing Interface combines a Solid Rotor interface with a Hydrodynamic Bearing interface. The coupling appears on the boundary level, where the pressure from the Hydrodynamic Bearing interface acts as a mechanical load for the Solid Rotor interface, causing motion and structural deformation of the rotor. The motion and deformation of the Solid Rotor affect the lubricant film thickness, hence altering the pressure of lubricant film.
•
The Beam Rotor with Hydrodynamic Bearing Interface combines a Beam Rotor interface with a Hydrodynamic Bearing interface. The coupling appears on the boundary level, where the pressure from the Hydrodynamic Bearing interface acts as a mechanical load for the Beam Rotor interface, causing motion and structural deformation of the rotor. The motion and deformation of the Beam Rotor affect the lubricant film thickness, hence altering the pressure of lubricant film.