Negative element error

fluidmechanics · July 10, 2015, 09:53

Dear All;

I have meshed a geometry with prism\tet elements and have run it in Fluent successfully introducing interface in some places. Now I want to import the Fluent case file into CFX. It will be imported and interfaces will also made. When the solver manager starts to run, it reports a negative element error at interface region: an element with -0.4E-10. So the solution stops. Is there any idea to solve this problem? Any CFX threshold change?

ghorrocks · July 11, 2015, 06:13

No, there is a negative volume element. You must fix it.

Either something went wonky in the import to CFX or for some reason I do not understand Fluent is tolerant of a few negative volume elements.

Steffen595 · July 12, 2015, 20:05

doesnt CFX has another mesh than CFX, maybe there it went belly up. Guess you have to import the model again and mesh it.

July 10, 2015, 09:53	Negative element error	#1
fluidmechanics Member mike Join Date: Jun 2011 Posts: 42 Rep Power: 14	Dear All; I have meshed a geometry with prism\tet elements and have run it in Fluent successfully introducing interface in some places. Now I want to import the Fluent case file into CFX. It will be imported and interfaces will also made. When the solver manager starts to run, it reports a negative element error at interface region: an element with -0.4E-10. So the solution stops. Is there any idea to solve this problem? Any CFX threshold change?

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July 11, 2015, 06:13		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	No, there is a negative volume element. You must fix it. Either something went wonky in the import to CFX or for some reason I do not understand Fluent is tolerant of a few negative volume elements.

July 12, 2015, 20:05		#3
Steffen595 Senior Member Join Date: May 2012 Location: Melbourne Posts: 161 Rep Power: 13	doesnt CFX has another mesh than CFX, maybe there it went belly up. Guess you have to import the model again and mesh it.