Cyclic Symmetry Boundary Condition Generation
Description: Defines parameters for automatic cyclic symmetry boundary condition generation on an axisymmetric model.
Format:
CYSYMGEN,
cid,
ptol
Example:
CYSYMGEN, 12, 1.-6
| Option
|
Definition
|
Type
|
Default
|
|---|
|
cid
|
Reference cylindrical coordinate system id that matches a
CORD1C or
CORD2C Bulk Data entry.
|
Integer > 0
|
Required
|
|
ptol
|
Near tolerance used to identify boundary grid points for the application of cyclic symmetric boundary conditions.
|
Real or blank
|
1.0E-10
|
Remarks:
- When set to a valid cylindrical coordinate system id, boundary conditions are automatically generated which force cyclic symmetric behavior. Grid points are automatically identified at each r-z boundary plane based on the specified near tolerance,
ptol. The two symmetry planes must have identical mesh patterns.
- The near tolerance is used to identify boundary grid points for the application of cyclic symmetric boundary conditions. The actual tolerance is derived using
ptol and a model reference dimension. Each r-z boundary is identified as all grid points within this tolerance at the minimum and maximum
θ values of the model.
- The CYSYMGEN and CYSYMTOL model parameters provide the same functionality as this command. See Section 5,
Parameters, for more information on
CYSYMGEN and
CYSYMTOL.