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August 10, 2007, 06:12 |
Hi,
I am trying to use the
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#1 |
Member
Lasse Boehling
Join Date: Mar 2009
Posts: 35
Rep Power: 17 |
Hi,
I am trying to use the simpleBouyantFoam solver with inlets and outlets. The problem is that it is complaining over a continuity error in the outflow. --> FOAM FATAL ERROR : Continuity error cannot be removed by adjusting the outflow. Please check the velocity boundary conditions and/or run potentialFoam to initialise the outflow. Total flux : 76.8043 Specified mass inflow : 10.4276 Specified mass outflow : 0 Adjustable mass outflow : 1.17153e-16 From function adjustPhi(surfaceScalarField& phi, const volVectorField& U,const volScalarField& p in file cfdTools/general/adjustPhi/adjustPhi.C at line 111. FOAM exiting So I tried to look at my boundaryconditions. They seem fine. Then I looked at potentialFoam. My problem is that if I want to initialise the outflow. p is calculated as p/rho. That is: the dimensions for p are not the same in potentialFoam as they are in bouyantSimpleFoam. If someone has any ideas how to solve/omit this problem I would be very happy. Best Regards, Lasse |
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August 10, 2007, 06:22 |
Yes: take the same geometry, s
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#2 |
Senior Member
Hrvoje Jasak
Join Date: Mar 2009
Location: London, England
Posts: 1,907
Rep Power: 33 |
Yes: take the same geometry, solve potential flow separately and copy ONLY the velocity field.
Alternatively (I take it you've got zeroGradient on U at outlet), set the initial field to something that is non-zero and try again. Please let me know what happens, I'm interested if I'm guessing right. Hrv
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Hrvoje Jasak Providing commercial FOAM/OpenFOAM and CFD Consulting: http://wikki.co.uk |
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August 10, 2007, 08:27 |
Hi,
Thanks for replying so
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#3 |
Member
Lasse Boehling
Join Date: Mar 2009
Posts: 35
Rep Power: 17 |
Hi,
Thanks for replying so fast. You were right. If I run potentialFoam and then copy the velocity field and run it with buoyantSimpleFoam it works. But it can only run for a limited amount of time, then it says: --> FOAM FATAL ERROR : Maximum number of iterations exceeded I can see that it is crashing trying to calculate pd. I'm not sure how to solve this. Any ideas? Lasse |
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August 10, 2007, 08:49 |
The solver itself is not limit
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#4 |
Senior Member
Hrvoje Jasak
Join Date: Mar 2009
Location: London, England
Posts: 1,907
Rep Power: 33 |
The solver itself is not limited in any way: there is no question of the solver running to a limited amount of time or any similar dishonesty.
I bet it is failing when trying to calculate some material properties as a function of temperature and pressure using Janaf. Try using constant material properties - it should run without trouble. Onc eyou get that sorted out, switch back to Janaf and see what happens. Enjoy, Hrv
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Hrvoje Jasak Providing commercial FOAM/OpenFOAM and CFD Consulting: http://wikki.co.uk |
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August 10, 2007, 09:31 |
Thanks, I bet you're right.
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#5 |
Member
Lasse Boehling
Join Date: Mar 2009
Posts: 35
Rep Power: 17 |
Thanks, I bet you're right.
I'm still learning OpenFOAM and has no idea where I can find material properties nor how to switch them on and off. Where do I do that? I don't know what Janaf is, but I guess it's not that important. Sorry for my stupid questions. Lasse |
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August 28, 2015, 13:32 |
How to run potentialFoam Separately
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#6 | |
Member
Werner
Join Date: Jul 2015
Location: West Lafayette, USA
Posts: 34
Rep Power: 11 |
Hi !!
could you please explain with more details how do you run potentialFoam separately and introduce that to my actual model? I'm trying to do this creating a new folder and trying to make my model as similar as posible to the tutorial potentialFoam/pitzDaily. So far I had some results as you can see in the image. How do I Insert the results of the simulation in my actual model ? Where are these results ? It seems as if they are are saved in the files of folder 0 because files U, P and Phi are very heavy. Quote:
thank you in advance for any help or interest . regards, Werner p.s. If you are curious why I started trying this please check my other reply in "Initializing with PotentialFoam" http://www.cfd-online.com/Forums/ope...tml#post561363. |
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