I have experience an error which I've never seen before when trying to subtract a model from a cylindrical domain in GAMBIT.

I get the error:

Problematic geometry. There are output entities with badly checking geometry

I can't see anything wrong as I just created a cylinder to act as the domain and tried to cut the model volume from this cylindrical volume. Has anyone had this error before or have any ideas of what might be wrong?

Thanks in advance for any help anyone can give.

Jenny

Could it be that the geometry you are trying to subtract is not entirely embedded within the cylinder? If there is an edge outside or sharing a exterior boundary with the cylinder this could cause problems. - Phil

Thanks for your reply Phil. It's some problem in GAMBIT I've discovered since posting this query to the forum.

I have imported a fan model from SolidWorks which is a fully enclosed surface. In GAMBIT 2.3.16 it is seeing a "hole" in the area where the blade attaches to the hub, even though the surface is fully enclosed so it shouldn't be "seeing" the hole. When I imported the geometry into an older version of GAMBIT it worked perfectly! So it seems to be a problem with GAMBIT which is a nusciance!

I guess you have it figured out then. One of the possible reasons could be the difference in tolerances in the two versions. This might not be the solution, but you might want to check this for future reference! Good Luck - Phil

Thanks Phil. I do think it's a problem that it sees an internal hole when there is a closed surface around the whole fan. I'm going to talk to Fluent about it and see what they have to say.

Best wishes, Jenny