CYCOPTCYCOPT, OPTION, Value1, Value2, Value3, Value4, Value5, Value6, Value7
Specifies solution options for a cyclic symmetry analysis.
OPTIONOne of the following options:
BCMULT | — | Controls whether cyclic sector
array parameter names are reused or created new for multiple entities. Value1
| — | The flag value. 0 (OFF or NO) | — | Create new array parameter names (default) | 1(ON or YES) | — | Reuse array parameter names |
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COMBINE | — | For linear static cyclic symmetry
analysis with non-cyclically symmetric loading only,
expands and combines all harmonic index solutions and writes them
to the results file during the solution phase of the analysis. Value1
| — | The flag value. 0 (OFF or NO) | — | Disable combining of harmonic index solutions (default) | 1 (ON or YES) | — | Enable combining of harmonic index solutions |
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DEFAULT | — | Set the default cyclic solution
settings. |
DOF | — | The degrees of freedom to couple from
the nodes on the low sector boundary to nodes on the high boundary: Value1
| — | The component pair ID number. | Value2, Value3, Value4, . . . , Value7
| — | The constraint-equation/-coupling degree of freedom
(DOF) for this pair. Repeat the command to add other DOFs. The default
is constraint-equation/-coupling all applicable DOFs. |
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FACETOL | — | Tolerance for inclusion of surface
nodes into your basic sector. Autodetect defaults to 15°, accommodating
most sections. Specify a new Value1 only
when extreme cut angles or complex model geometry cause surface nodes
to be excluded. See Notes (below) for more information. ANSYS, Inc. recommends that successful auto-detection depends more
on the value of ANGTOL than the value of FACETOL. Please refer to CYCOPT Auto Detection Tolerance Adjustments for Difficult
Cases for more
information about auto-detection and the CYCOPT command. Value1
| — | The face tolerance applies only to auto detection
from node/element models (already meshed and no solid model), and
it defaults to 15°. |
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HINDEX | — | The harmonic index solution ranges
for modal or buckling cyclic symmetry analyses. The SOLVE command initiates
a cyclic symmetry solution sequence at the harmonic indices specified.
(By default, the SOLVE command solves for all available harmonic indices.) Static and harmonic cyclic symmetry solutions always use all harmonic indices required
for the applied loads. EVEN / ODD | — | For low-frequency electromagnetic analysis only, EVEN
specifies a symmetric solution and ODD specifies an antisymmetric
solution. The value you specify is based on the harmonic index: EVEN (default) indicates harmonic index = 0, and ODD indicates
harmonic index = N / 2 (where N is an integer representing the number of sectors
in 360°). A value of ODD applies only when N is an even number. The CYCOPT command with this HINDEX option
is cumulative. To remove an option (for example, EVEN), issue this
command: CYCOPT,HINDEX,EVEN,,,-1 | ALL | — | Solve all applicable harmonic indices.
Note: Value2 must be blank.
| Value1, Value2, Value3
| — | Solve harmonic indices in range Value1 through Value2 in steps of Value3. Repeat the command to add other ranges. The
default solves all applicable harmonic
indices. | Value4
| — | The only valid value is -1. If specified, it removes Value1 through Value2 in
steps of Value3 from the set to solve.
By default, if Value4 = -1 then Value1 = 0, Value2 = 0,
and Value3 = 1. | Value5
| — | For static and harmonic analyses, the tolerance for
determining if a Fourier contribution of a load contributes to the
response (default = 1.0E-5). If Value5=STATIC, it forces the program to solve only the specified harmonic
indices (even if a load may have a Fourier contribution in an index
not specified). |
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LDSECT | — | Restricts subsequently defined
force loads and surface loads to a specified sector. The restriction
remains in effect until you change or reset it. This option is not
available for harmonic analyses based on mode-superposition (CYCOPT,MSUP,1) Value1
| — | The sector number. A value other than 0 (default)
is valid for a cyclic symmetry analysis with non-cyclically symmetric
loading only. A value of 0 (or ALL) resets the default behavior
for cyclic loading (where the loads are identical on all sectors). |
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MOVE | — | Specifies if the program should move
high- or low-edge component nodes paired within the specified tolerance
(TOLER) to create precisely matching pairs. Value1
| — | The flag value. 0 | — | Do not move edge component nodes (default) | 1 or HIGH | — | Move the high-edge component nodes to precisely match
the low-edge component nodes | -1 or LOW | — | Move the low-edge component nodes to precisely match
the high-edge component nodes |
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MSUP | — | This flag is used to limit the results written to the
Jobname.MODE and Jobname.RST files in a modal
cyclic symmetry analysis. In a linear perturbation analysis, the modal analysis and the
first load step of the preceding base analysis must be set to the same value. Value1
| — | The flag value. 0 (OFF or NO) | — | Write results for the basic and duplicate sectors to the Jobname.MODE and
Jobname.RST files | 1 (ON or YES) | — | Write only the basic sector results to the Jobname.MODE and
Jobname.RST files for use in a subsequent
mode-superposition-based analysis (default) |
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STATUS | — | List the solution option settings
active for the cyclic model. |
TOLER | — | The tolerance used to determine
whether a node on the low edge is paired with a node on the high edge. Value1
| — | The tolerance value. Greater than 0 | — | The absolute distance tolerance for automatic sector-boundary
detection and low-/high-edge component node pairing | Less than 0 | — | The relative tolerance for automatic sector-boundary
detection and low-/high-edge component node pairing. In this case,
the tolerance is Value1 * Length, where Length is
the length of the diagonal of an imaginary box enclosing the model | 0 | — | Tolerance is set to -1.0 x 10-4 (default) |
| Value2
| — | ANGTOL = Maximum allowable
angle tolerance. (default = 0.01°)
The valid range
for ANGTOL is model dependent. If you input both the number of sectors and a sector angle,
the angle must match 360/(number of sectors) within ANGTOL. If you input only a sector angle, it must divide evenly into
360° within ANGTOL. If you input a sector angle, the final cyclic sector must span
that angle within ANGTOL. For auto detected sector angle, the final cyclic sector must
span 360/(number of sectors) within ANGTOL, everywhere along the LOW/HIGH boundaries. If ANGTOL is too small, your CAD
or FEA model may not be accurate enough to allow auto detection or
verification. If ANGTOL is too large, you may get
an unexpected or incorrect boundary definition, or in other cases
fail to detect the boundaries. For some difficult cases from FEA models (not solid models),
you may need to change the value of FACETOL to achieve auto detection. Please refer to CYCOPT Auto Detection Tolerance Adjustments for Difficult
Cases for more
information about auto-detection and the CYCOPT command. |
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USRROT | — | Flag specifying whether ANSYS should
override automatic nodal rotations to edge components and allow you
to apply nodal rotations manually. Value1
| — | The flag value. 0 (OFF or NO) | — | Allow automatic node rotation (default) | 1 (ON or YES) | — | Suppress automatic node rotation. If you select this
option, you must apply appropriate
nodal rotations to all edge component nodes; otherwise, your analysis
will yield incorrect solution results. | LOW | — | Suppresses automatic rotation of low-edge component
nodes only, allowing you to apply them manually. Automatic rotation
of high-edge component nodes occurs to produce the matching edge nodes
required for a valid cyclic solution. | HIGH | — | Suppresses automatic rotation of high-edge component
nodes only, allowing you to apply them manually. Automatic rotation
of low-edge component nodes occurs to produce the matching edge nodes
required for a valid cyclic solution. |
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VTSOL | — | Employ Variational Technology to
accelerate your cyclic symmetry analysis. Value1
| — | The flag value. 0 (OFF or NO) | — | Do not use Variational Technology (VT) (default) | 1 (ON or YES) | — | Use Variational Technology (VT) |
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Command Default
No defaults are available for the CYCOPT command.
You must specify an argument (OPTION) when
issuing the command. Other values which may be necessary depend upon
which argument you specify.
Notes
The program solves a cyclically symmetric model (set up via
the CYCLIC command during preprocessing) at the
harmonic indices specified via the CYCOPT command.
The CYCOPT,COMBINE option is an alternative
to the /CYCEXPAND command and is especially useful
for testing purposes. However, ANSYS, Inc. recommends specifying COMBINE
only when the number of sectors is relatively small. (The option expands
nodes and elements into the full 360° and can slow postprocessing
significantly.
If you issue a CYCOPT,TOLER command to set
a tolerance for edge-component pairing before issuing the CYCLIC command, the CYCLIC command uses the specified tolerance when performing automatic edge-component
detection.
In cases involving non-cyclically symmetric loading (that
is, when LDSECT > 0), the underlying command operations create
or modify the required SECTOR tabular boundary condition (BC) data
to apply on the appropriate sector. Therefore, it is not necessary
to manipulate tables for situations where the applied BC is not a
function of other tabular BC variables such as TIME, X, Y, Z, and
so on.
To delete a previously applied load on a specified sector, issue
an FDELE command.
Because edge nodes are rotated into the cyclic coordinate system
during solution, any applied displacements or forces on sector edges
will be in the cyclic coordinate system.
The CYCOPT command is valid in the preprocessing
and solution stages of an analysis.
To learn more about analyzing a cyclically symmetric structure,
see the Cyclic Symmetry Analysis Guide.
Distributed ANSYS Restriction The COMBINE and VTSOL options are not supported in Distributed ANSYS.