A negative ELEMENT volume

Pavelko · November 14, 2010, 16:56

Hello all,

I'm doing an Transient FSI using CFX. When I start the CFX solver I get A NEGATIVE ELEMENT VOLUME error.
I'm using a moving mesh, so I think this is the source of the problem.
How can prevent it?

Thanks,
Pavelko

ghorrocks · November 14, 2010, 17:46

This is a common problem in FSI simulation. It simply means you have moved the mesh far enough to cause some elements to turn inside out and that means the solver will fail. You have to improve the mesh motion specification to bettyer handle the motion, include remeshing or change the model to use other approaches (for instance GGI interfaces).

November 14, 2010, 16:56	A negative ELEMENT volume	#1
Pavelko Member Pavelistyj Join Date: Jul 2010 Posts: 42 Rep Power: 16	Hello all, I'm doing an Transient FSI using CFX. When I start the CFX solver I get A NEGATIVE ELEMENT VOLUME error. I'm using a moving mesh, so I think this is the source of the problem. How can prevent it? Thanks, Pavelko

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November 14, 2010, 17:46		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	This is a common problem in FSI simulation. It simply means you have moved the mesh far enough to cause some elements to turn inside out and that means the solver will fail. You have to improve the mesh motion specification to bettyer handle the motion, include remeshing or change the model to use other approaches (for instance GGI interfaces).