negative volume encountered

March 12, 2008, 23:34

Hi,

I encountered an error message while i was solving using cfx-solver. i think it might be due to the mesh. Is there any reason for a mesh to becomes negative volume?

I am modelling a cylinder,and what i am thinking is it may be caused by the higher length scale used.Any such problems before? I had copy the error message below.

Thanks, Maga

| ERROR #002100011 has occurred in subroutine cVolSec. | | Message: | | A negative SECTOR volume has been detected. Execution will proceed | | but this is a possible cause of robustness problems. | | The location of the first negative volume is reported below. | | Volume : -0.2421E-14 | | Location : ( -0.99474E-02, 0.28970E+00, -0.39715E+00) | | This warning may be made fatal by setting the expert parameter | | 'negative volume option = 1'.

alinik · October 7, 2009, 08:53

hi maga

have u found a way to overcome ur problem?, coz I am facing it now and I need a solution as soon as possible

thanks ,alinik

ghorrocks · October 7, 2009, 17:31

You have to debug the mesh motion and find why it is folding the mesh. Do a simulation where you write out the mesh every timestep for a few timesteps before it crashes and you should see where it folds.

Once you have found the location then you need to fix it, but I will wait for your return posting before we go there.

March 12, 2008, 23:34	negative volume encountered	#1
Maga Guest Posts: n/a	Hi, I encountered an error message while i was solving using cfx-solver. i think it might be due to the mesh. Is there any reason for a mesh to becomes negative volume? I am modelling a cylinder,and what i am thinking is it may be caused by the higher length scale used.Any such problems before? I had copy the error message below. Thanks, Maga \| ERROR #002100011 has occurred in subroutine cVolSec. \| \| Message: \| \| A negative SECTOR volume has been detected. Execution will proceed \| \| but this is a possible cause of robustness problems. \| \| The location of the first negative volume is reported below. \| \| Volume : -0.2421E-14 \| \| Location : ( -0.99474E-02, 0.28970E+00, -0.39715E+00) \| \| This warning may be made fatal by setting the expert parameter \| \| 'negative volume option = 1'.

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October 7, 2009, 08:53		#2
alinik Senior Member ali Join Date: Oct 2009 Posts: 318 Rep Power: 17	hi maga have u found a way to overcome ur problem?, coz I am facing it now and I need a solution as soon as possible thanks ,alinik

October 7, 2009, 17:31		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	You have to debug the mesh motion and find why it is folding the mesh. Do a simulation where you write out the mesh every timestep for a few timesteps before it crashes and you should see where it folds. Once you have found the location then you need to fix it, but I will wait for your return posting before we go there.