CEIMS
CEIMS, TOLER,
--, Sname1,
Sname2, KPRINT,
--, --, --,
--, IntF1Nod,
IntF2Nod
Generates constraint equations at the interstage boundary in a
multistage cyclic symmetry analysis.
Note: CEIMS command is not part of the CYCLIC procedure for cyclic symmetry analysis. This command is used in a multistage cyclic symmetry analysis (see also MSOPT) to generate interstage constraint equations.
TOLERTolerance for determining if selected nodes are on the interface.
TOLERis a fraction of the element dimension (defaults to 0.25 (25%)). Nodes outside the element by more than the tolerance are not accepted as being on the interface.--Unused field.
Sname1The name of the first stage or part. For details on required node and element selections, see Node and Element Selection Requirements.
Sname2The name of the second stage or part. For details on required node and element selections, see Node and Element Selection Requirements.
KPRINTOption to print mapped nodes and elements.
0 (or OFF)
—
Do not print mapped nodes and elements (default).
1 (or ON)
—
Print mapped nodes and elements.
--,--,--,--Unused fields.
IntF1NodThe name of the interstage nodal component of the first stage or sector part to be tied to the second stage or part named
IntF2Nod. It is optional to specifyIntF1Nod(see Node and Element Selection Requirements), but if used,IntF2Nodmust also be specified.IntF2NodThe name of the interstage nodal component of the second stage or sector part to be tied to the first stage or part named
IntF1Nod. It is optional to specifyIntF2Nod(see Node and Element Selection Requirements), but it used,IntF1Nodmust also be specified.
Notes
This command can be used to generate constraint equations to tie the interface nodes of two cyclic sector parts.
Mapping is performed so mesh patterns at the interface of both parts can be different.
This command is supported for the following degrees of freedom (DOFs) at the interstage boundary: UX, UY, UZ, ROTX, ROTY, ROTZ. Since only 3D elements are supported, UX, UY, and UZ are required. Note that if rotational DOFs are included, all three of them must be present.
Node and Element Selection Requirements
You can specify the interface nodes in one of two ways:
If you specify
IntF1NodandIntF2Nodnodal components, there are no other node or element selection requirements.Otherwise, prior to issuing CEIMS:
the nodes at the interface of the first cyclic sector part (
Sname1, part having the largest cyclic sector angle) must be selected, andthe elements at the interface of the second cyclic sector part (
Sname2, part having the smallest cyclic sector angle) must be selected.
For cyclic sector parts, select only base sector quantities (not duplicate sector ones). See also the NSEL and ESEL commands for selecting nodes and elements.
The degrees of freedom of the first part interface nodes are interpolated with the corresponding degrees of freedom of the nodes of the second part interface elements using the shape functions of those elements.
Constraint equations are created between interface nodes. Those nodes should not have any other constraints defined, but if so they must be compatible.