Repairing Surfaces

Diagnose and fix surfaces before running the surface remesher.

It is important to repair the tessellated surface before moving onto the next stage in the meshing process.

The surface repair operations can affect association with underlying CAD parts. In general, any surface repair operation that creates new faces causes a loss of CAD association for the new faces, and possibly the face neighbors. If you activate CAD projection, no projection takes place for these disassociated faces. Therefore, if CAD association is important, keep surface repair to a minimum. You can view the current CAD association for a given surface using the Color Faces display control.

A typical workflow to follow to fix surfaces errors is presented below:

1. In the Surface Repair tool, in the Diagnostics slide out, select Surface and click Manage.
   The Create/Modify Thresholds panel appears.
   

   

   
   
2. In the Create/Modify Thresholds panel:
   • Deactivate and activate the desired thresholds using the corresponding checkboxes in the first column. To activate or deactivate all thresholds, use the Enable All Thresholds option in the table header.
   • For each of the desired thresholds, specify the required custom settings. See Custom Threshold Options.
   • Click New Table Entry to create a custom threshold and define it. See Custom Threshold Options.

     You cannot change the diagnostic type once it has been created.

   • Select a custom threshold and click Delete Selected to delete it. You can only delete custom thresholds.
3. Click OK to run the diagnostics.
   The tool analyzes the surfaces for errors and displays the results in the Diagnostics slide out.
   

   

   
   
   Errors are classified into color-coded categories. The colored boxes in the Diagnostics slide out report the number of times that a category of error is found in the active model. The same colors are used in the active scene to highlight the faces and edges on which the errors were found.
   

   

   
   

   See Surface Errors for a list of errors.

   As you fix errors, the number in each category updates to indicate the remaining number of items for which that category of error is found. It is common for the number errors to increase for error types while fixing another error type. For example, deleting faces to remove a pierced surface temporarily increases the number of free edges.

   Note	When you click OK in the Create/Modify Thresholds panel, Simcenter STAR-CCM+ only reruns diagnostics that need to be rerun due to changes to the input.

   Diagnostics are marked as out-of-date if:

   • You modified its threshold properties in the panel.
   • You execute other diagnostics while it was not activated. This condition is true even if the other diagnostics are up-to-date.
   • Once you deactivate a diagnostic and click OK, it is marked out-of-date.
4. Control what displays in the Diagnostics slide out. See Diagnostics Slide Out Threshold Input Reference.