General
When a Condensed Part Interface includes faces, edges, vertices, or nodes that overlap with other interfaces where constraint equations are applied, such as remote points, boundary conditions scoped to remote points, MPC-based contact, etc.), the solver may remove some master node DOFs in the generation pass. This may interfere with the use pass solve as well as postprocessing.
If you define a joint between a rigid body and flexible body, you need to specify the Condensed Part on the Reference side in order to get accurate results.
Importing Condensed Parts
| Use the right-click options of the Worksheet to automatically create node-based Named selections for use in the analysis to scope features such as Contact, Remote Points, Joints, etc. |
| Remote Points need to be connected to the interfaces of the Imported Condensed parts. To avoid rigid body modes, set the Behavior property of the Remote Point to Coupled. This applies to other connection types, such as a Joint that is also connected through remote points. |
| It is also recommended to use Imported Condensed part interface on the Reference/Source side while connecting the superelements to the rest of the model. |
Rigid Dynamics Analyses
Review the following recommendations when you are defining Condensed Parts.
- Analysis Settings
For the property Time Integration Type of the Analysis Settings, the default option is Program Controlled. This option automatically uses the Implicit Stabilized Generalized Alpha setting. Ansys recommends the use of generalized implicit time integration. The Runge-Kutta explicit time integration option may lead to small time steps and consequently significant computation effort during the Use Pass. Older models (prior to R17.0) may be specified to use a Runge-Kutta option by default. If so, the processing requirements will be significant during the Use Pass. It is also recommended to set Energy Accuracy Tolerance property to for better performance during implicit time integration.
Note: For additional information, see the Analysis Settings Help for the Nonlinear Controls for Rigid Dynamics Analyses.
The number of stored results points has a direct effect on the computational efforts required by Expansion Pass. It is therefore recommended that you specify the Store Results At property of the Output Controls, in the Analysis Settings, as and set the Value property accordingly to limit the number of result time points and to reduce the processing requirements of the expansion.
Analyses Using the Mechanical APDL Solver
You should use the same setting for the number of cores for the generation process for all condensed parts as well as your solution and expansion(s) as defined by the Distribute Solution option in the Advanced Settings of the Solve Process Settings dialog.