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Pipe flow in settlingFoam floating point exception |
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December 21, 2011, 12:18 |
Pipe flow in settlingFoam floating point exception
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#1 | ||||||
New Member
Jochem van den Bosch
Join Date: Oct 2011
Location: Rotterdam, The Netherlands
Posts: 20
Rep Power: 15 |
Dear fellow FOAM'ers,
I'm trying to simulate a two phase (sand/water) flow in a straight pipe using settlingFoam. To start, I altered the tank3D tutorial of settlingFoam. I use a pipe mesh which I already have succesfully used with single phase flows. Unfortunately, whatever I try, I'm getting a 'Floating point exception' after 5-20 iterations. I suppose this has something to do with the boundary conditions but I cannot find my mistake. These are them. Would anybody know where I went wrong??? Quote:
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December 21, 2011, 17:03 |
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#2 |
New Member
Stephen Lucchesi
Join Date: Jul 2011
Posts: 8
Rep Power: 15 |
your courant number is going crazy. Likely the timestep is set too big. try reducing it.
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December 22, 2011, 05:12 |
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#3 | |
New Member
Jochem van den Bosch
Join Date: Oct 2011
Location: Rotterdam, The Netherlands
Posts: 20
Rep Power: 15 |
Hi Stephen, my courant number is going like crazy indeed, but when I reduce my timestep with a factor 1000! to 0.0001 I get the same message after 54 iterations.
But when I look at those 54 iterations in ParaView I see no pressure distribution (see attachment) and also no speeds... This makes me believe there is something wrong in the boundary conditions.... Quote:
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February 16, 2012, 04:05 |
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#4 |
New Member
Matt
Join Date: Sep 2011
Posts: 1
Rep Power: 0 |
Hi Jochem, I am having a similar issue to this, did you manage to fix it?
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February 16, 2012, 04:24 |
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#5 |
New Member
Jochem van den Bosch
Join Date: Oct 2011
Location: Rotterdam, The Netherlands
Posts: 20
Rep Power: 15 |
Hi Matt, my problem was that I set the speed in a direction perpendicular to the wall instead of parallel. But in general the problem can be solved by decreasing your time step. What solver are you using?
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