Constraint Checks Reference

Set up constraint checks to specify criteria for mapping. If you enable a constraint check, the mapper only maps field data to target points that pass the constraint check. You can specify alternate field values at target points that fail the constraint checks.

Proximity Constraint Check Reference

The proximity check is relevant if the surfaces are physically separated from each other or have some mismatch to avoid mapping data. Such a situation is possible if the source parts do not completely represent some of the target parts. This scenario is often encountered in solid/fluid coupling, especially with external packages. For co-located surfaces, a proximity check is not required. When the proximity constraint is activated, the distance between parts is compared to a tolerance you define. If the distance is greater than this tolerance, an alternate value is used. Activate and set the proximity constraint in the properties of the Target Specifications > [Target] > Proximity Constraint node.
注 Be aware of the general mesh sizes on parts while choosing this tolerance. If the mesh sizes vary extensively among the various selected parts, choose appropriate subsets of the parts for mapping.
Properties
Enable
When activated, the mapper checks if the target point and its nearest source point are within a certain distance. The mapper only maps field data to target points that pass the proximity check. You can specify alternate field values at target points that fail the proximity check. See Alternate Value Specification Reference.
Use Absolute Tolerance
When activated, the mapper checks if the target point and its nearest source point are within the value that you specified for the Absolute Proximity Tolerance. When deactivated, the mapper checks if the target point and its nearest source point are within the value specified for the Relative Proximity Tolerance, multiplied by the longest element edge-length of the target surface mesh.
Relative Proximity Tolerance
Specifies a multiplication factor for checking proximity. The tolerance is calculated by multiplying this factor by the longest element edge-length of the target surface mesh. For example, if the maximum target edge length is 0.05 mm and the source and target meshes are 0.1 mm apart, then a factor of 2 is required to enable mapping.

The mapper uses the value when you activate Enable, and deactivate Use Absolute Tolerance.

Absolute Proximity Tolerance
Specifies a value for the tolerance for checking proximity. The mapper uses the value when you activate both Enable and Use Absolute Tolerance.

Normal Direction Constraint Check Reference

The normalcy check is relevant for surface-to-surface mapping. This check ensures that the source and target faces are matched if the angle between their face normals is within the specified tolerance. The desired angle depends on the specific mapping scenario. For example, for interfaces, where the mapping is between the opposing sides of an interface, source and target faces must have opposite surface normals. In remeshing applications, where the mapping is between different meshes of the same surface, aligned surface normals are desired. This check provides the required controls for these scenarios.

Depending on the specified normalcy tolerance, Simcenter STAR-CCM+ checks that the surface normals of source and target faces are aligned (tolerance in the range [0, 90]), or are opposite (tolerance in the range [90, 180]):

  • range [0, 90): if the angle between the surface normals of the target and source faces is less than the specified tolerance, the surface normals are considered aligned and the normalcy check is satisfied.

  • range [90, 180]: if the angle between the surface normals of the target and source faces is greater than or equal to the specified tolerance, the surface normals are considered opposite and the normalcy check is satisfied.

To activate and define the normal direction constraint, set the properties of the Target Specifications > Surface > Normal Direction Constraint node.

Properties
Enable
When activated, the mapper checks if the angle between surface normals at the target point and the corresponding source point is in the range of an allowable angle (degrees). This check only applies to surface-to-surface mapping. The mapper only maps field data to target points that pass the check. You can specify alternate field values at target points that fail the normal direction constraint check. See Alternate Value Specification Reference.
Minimum angle (degrees)
Specify an allowable angle between source and target normals.
  • [0,90) — align
  • [90, 180] — opposite