Or, do the opposite: Start out with a very simple geometry, make sure that the model solves and gives you reasonable results, and then add on complexity as you go. Simplify or avoid small structures, utilize symmetries, eliminate narrow intersections with curved objects, and remove all unnecessary parts. If it does not seem to help, try also the next tip.Ĭhange the geometry. Trial-and-error is usually the only way to work around the error. Try to perform the same operation with different Repair tolerances or change the order of the input objects if you get a failure. The repair tolerance in the Union feature makes the algorithm more intelligent in terms of accepting flaws, and also repairing them.
If you have several geometry objects it is often a good idea to do a manual union of these. It can be changed in the Settings window of the Geometry head node, under Geometric Representation. If the Parasolid® CAD kernel is already used to represent the geometry and if you have the Design Module, enable the Design Module Boolean operations for even more robust solid operations. The geometry kernel, or Geometric Representation, can be changed in the Settings window of the Geometry head node. Any of these products makes the Parasolid® CAD kernel available and enables more robust solid operations in the COMSOL environment. If you plan to create more elaborate 3D models it is highly recommended that you get one of the products: Design Module, CAD Import Module, LiveLink™ for AutoCAD®, LiveLink™ for SOLIDWORKS®, LiveLink™ for PTC® Pro/ENGINEER®, LiveLink™ for PTC® Creo® Parametric®, LiveLink™ for Revit®, LiveLink™ for Solid Edge®, or LiveLink™ for Inventor®. Sometimes the new improved features can fix the problem. If you are not running the latest version of COMSOL Multiphysics, please upgrade.
What can you do to get around this problem? But you may also get similar problems when you have complicated geometry models containing large aspect ratios in surfaces, small angles between edges in vertices, or very small entities. You can get these problems when there is a lack of accuracy in the geometry model either due to a CAD import with low accuracy in the data, or by difficulties in drawing exactly matching parts inside COMSOL Multiphysics. It may be difficult to determine the exact cause of this error, it might arise for seemingly very simple geometries. The action of combining the objects is rather complex and unfortunately it can fail. If your geometry consists of several objects, the objects are automatically combined into a single object when you Finalize the geometry, which happens automatically when you go from the Geometry branch to any other branch in the Model Tree. This error means that COMSOL Multiphysics failed to resolve the geometry relations.