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What does the acuPrep message regarding surfaces 'in the interior' represent?

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During the processing stage, acuPrep determines whether or not 'surfaces' from Simple BC or Element BC commands are boundaries or internal to the parent element set. If a surface element (tri or quad) has a volume element on only one side - or volume elements from different sets on both sides - it is considered to be a boundary. If a surface element has a volume element on both sides, and those volume elements are in the same element set - it is considered to be internal.

If there are surfaces in the geometry between volumes in the same element set, these surfaces should not have Boundary Conditions defined. If there truly is an internal 'wall' (such as a baffle) within a given volume, the mesh surfaces should be split to yield two sets of nodes and two sets of surface elements.


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