In an assembly, faces that come into contact with each other should have aligned nodes so that the results, such as heat transfer across the surface, are as accurate as possible.
By default, a precision alignment of nodes is generated when an assembly is imported with Autodesk Moldflow Design Link. If there are errors in the imported CAD model, such as misalignment of the contact faces, faces intersecting with opposite surfaces, or boundaries not aligning, the alignment of nodes may not be possible and in some instances the meshing may fail. If this occurs, you can select Fault tolerant and re-import the model.
With the Fault tolerant option, small variations in the CAD model are compensated for, and the mesh is aligned where possible. You should check your mesh to ensure a suitable result. If the CAD model is still not suitable for this option, the model should be reimported with the Ignore contact option selected.
The Ignore contact option is used when the CAD model has errors that cannot be automatically resolved. In this case, a mesh will be generated for the component parts, regardless of any errors in the CAD model. The resultant mesh may have to be modified manually to improve the match on contact surfaces or remove surface intersections.