negative volume ..,mesh update failed

wolverine · April 15, 2015, 04:59

i have been encountering this pbm . my case is a sinusoidal accelerated boundary wall .. is there any specific criteria to enhance the meshing ?

pumpkin · April 15, 2015, 07:04

Try setting a really small time step, so that the mesh does not move more than a single cell.

wolverine · April 15, 2015, 10:23

i tried lower time steps.. will mesh morphing helps??

pumpkin · April 16, 2015, 04:08

I'm not sure mesh morphing will help.

I suggest you to check where are your negative volumes. Try doing a plot of volume (with different iso-values).

Then check if there are some left-handed cells. If so, I think you can repair them with in the command line with /grid/modify-zones/repair-face-handedness

Hope this helps.

April 15, 2015, 04:59	negative volume ..,mesh update failed	#1
wolverine New Member logan Join Date: Feb 2012 Posts: 10 Rep Power: 14	i have been encountering this pbm . my case is a sinusoidal accelerated boundary wall .. is there any specific criteria to enhance the meshing ?

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April 15, 2015, 07:04		#2
pumpkin New Member Marc Pelegri Join Date: Mar 2014 Posts: 5 Rep Power: 12	Try setting a really small time step, so that the mesh does not move more than a single cell.

April 15, 2015, 10:23		#3
wolverine New Member logan Join Date: Feb 2012 Posts: 10 Rep Power: 14	i tried lower time steps.. will mesh morphing helps??

April 16, 2015, 04:08		#4
pumpkin New Member Marc Pelegri Join Date: Mar 2014 Posts: 5 Rep Power: 12	I'm not sure mesh morphing will help. I suggest you to check where are your negative volumes. Try doing a plot of volume (with different iso-values). Then check if there are some left-handed cells. If so, I think you can repair them with in the command line with /grid/modify-zones/repair-face-handedness Hope this helps.