a negative element volume has been detected

alirezame · June 9, 2014, 06:39

Hello guys,

I am simulating a centrifugal compressor consists of rotor and stator zones via Ansys CFX 15. when I wanna run the calculation I face with an error which says:
'' a negative element volume has been detected ... ''
type is steady state and I examined with both stage and frozen rotor models.
Also, grid was created by Pointwise software.
I would appreciate if someone could help me.

ghorrocks · June 10, 2014, 08:40

This error is common in ICEM when people smooth the mesh too much in the mistaken belief that more smoothing is good. I do not know Pointwise/Gridgen very well, but I presume it has the same trap.

I recommend you remesh and do little or no mesh smoothing.

alirezame · June 10, 2014, 08:46

many thanks for your consideration.

When I wanna run this problem without any rotation part, I mean I try to just check either it works or not, it works without any error, but when I use turbo mode and define centrifugal compressor,.... after all this error is shown.

June 9, 2014, 06:39	a negative element volume has been detected	#1
alirezame Member Join Date: Nov 2013 Posts: 57 Rep Power: 13	Hello guys, I am simulating a centrifugal compressor consists of rotor and stator zones via Ansys CFX 15. when I wanna run the calculation I face with an error which says: '' a negative element volume has been detected ... '' type is steady state and I examined with both stage and frozen rotor models. Also, grid was created by Pointwise software. I would appreciate if someone could help me.

June 10, 2014, 08:40		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	This error is common in ICEM when people smooth the mesh too much in the mistaken belief that more smoothing is good. I do not know Pointwise/Gridgen very well, but I presume it has the same trap. I recommend you remesh and do little or no mesh smoothing. alirezame likes this.

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June 10, 2014, 08:46		#3
alirezame Member Join Date: Nov 2013 Posts: 57 Rep Power: 13	many thanks for your consideration. When I wanna run this problem without any rotation part, I mean I try to just check either it works or not, it works without any error, but when I use turbo mode and define centrifugal compressor,.... after all this error is shown.