Define boundary coupling using the Manual method

The manual cyclic symmetry pairing method lets you select both the source and target region faces.

1. Choose Home tab→Loads and Conditions group→Simulation Object Type list→Cyclic Symmetry .

2. In the Cyclic Symmetry dialog box, from the type list, select Manual Cyclic Symmetry.

3. In the Source Region group, select a region or click Create Region to create one. Both regions can be geometry-based, FEM-based, or one region can be geometry-based and one FEM-based.

4. In the Target Region group, select a region or click Create Region to create one.

5. From the CSYS list, select the global cyclic analysis coordinate system or select User-Defined Cylindrical to create your own. The coordinate system you select must be cylindrical and its Z-axis must be collinear with the global cyclic analysis coordinate system.

6. If you selected User-Defined Cylindrical, from the Local list, select the method and create the coordinate system. For more information, see the CSYS dialog box.

7. (Optional) To have the software use the designated reference coordinate system as the nodal displacement coordinate system of the target set objects, select the Set Displacement CSYS check box

8. Set how you want to define the number of segments:To let the software determine the number of segments, clear the Override Calculated Number of Segments (NSEG) check box and set the distance and angles tolerances allowed between segments. Note: The software automatically computes the segment angle and the number of segments. It uses the distance and angle tolerances during the computation to determine if your modeled segment is appropriate for cyclic symmetry. Ideally, the topology of your source and target geometry match, and your modeled segment is an even division of 360°. Models that are less than ideal may require increased tolerance or geometry corrections. Before you increase the tolerances, make sure you defined the global cyclic analysis coordinate system correctly. In the Distance Tolerance box, type a distance tolerance.The software uses sample points to compute bounding boxes in the source and target regions. The bounding boxes must be identical within the distance tolerance you specify. In addition, the software rotates the source into the target region. It uses the distance tolerance to compare whether the source and target have matching topology. Caution: Modeling non-cyclic symmetric features is not an ideal modeling scenario.Features, such as holes or slots, that are present in one region but not in the other can cause the regions to fail the compatibility check. When this occurs, the software cannot compute the number of segments (NSEG). To override the incompatibility check, type a value for NSEG in the Number of Segments box. In the Angle Tolerance box, type a value.The software computes the difference between the actual segment angle as it is modeled, and the segment angle computed using the closest integer NSEG in a full circumference. These angles should match within the angle tolerance. For example, if you model the geometry as a 20.5° segment, the closest integer number of segments in a full circumference is 18, which corresponds to a 20° segment. The Angle Tolerance value, in this case, must be larger than (20.5 – 20) = .5°. To override the values the software calculates for the number of segments, select the Override Calculated Number of Segments (NSEG) check box and in the Number of Segments (NSEG) box, type the number of segments.

9. Click Calculate Segment.

10. Review the values shown in the Segments group of the dialog box. The value in the Calculated Segment Angle box is the angle between the faces, and the value in the Calculated Number of Segments box is the number of segments (360° divided by the angle between the faces). For example, if the angle is 10°, the calculated number of segments is 36. The software uses the modeled geometry to automatically compute the angle and the calculated number of segments. For example, if your model is a 20.5° segment, the software displays 20.5 in the Calculated Segment Angle box. The software also computes the number of segments based on the modeled geometry as 360/20.5 = 17.56 and displays the value in the Calculated Number of Segments box. The software also writes the value to the input file in the NSEG field on the CYCSET bulk entry. The software uses the NSEG value when sweeping the source nodes into the target regions. The value in the Number of Segments box is the value computed in the Calculated Number of Segments box rounded to the closest integer. The software also writes it to the NSEG card. For example, if the angle is a 20.57° segment, the software displays 18 (360/20.5 = 17.56, then rounded to 18).

11. Click OK.

How do I

Define boundary coupling using the Automatic method

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Cyclic symmetric boundary coupling

Simcenter 3D Multiphysics workflow—cyclic symmetric boundary coupling

Cyclic symmetric post-processing options

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Define boundary coupling using the Manual method, Simcenter 3D 2021.1 Series

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