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June 10, 2014, 02:13 |
very simple problem with interFoam
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#1 |
Member
sajad
Join Date: Aug 2013
Posts: 70
Rep Power: 12 |
dear foamer
I have very simple problem with interFoam: I wanna saw the surface tension true implemented in interFoam. I used a square without gravity and I must saw square change into circle and steady. I run my case after that square change to circle but droplet start move in domain and has a unsteady regime and stream line is wrong. I change boundary conditions and mesh. answer be better but still answer is wrong and just amplitude move is decrease. I'm used openFoam 2.2.1 and ubuntu 12.04 do you have any idea about my problem? best regards Sajad |
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June 10, 2014, 03:14 |
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#2 |
Senior Member
Niels Gjoel Jacobsen
Join Date: Mar 2009
Location: Copenhagen, Denmark
Posts: 1,900
Rep Power: 37 |
Hi Sajad,
Yes, it is because of the generation of spurious current because of numerical inaccuracies in the surface treatment. You will find a huge number of threads on this forum and scientific publications on this matter. Kind regards, Niels P.S. This is not a "Programmering and development" question, so proper choice of subforum will help you in the future.
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August 9, 2014, 22:19 |
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#3 |
Senior Member
Santiago Marquez Damian
Join Date: Aug 2009
Location: Santa Fe, Santa Fe, Argentina
Posts: 452
Rep Power: 23 |
Hi, the main problem is the curvature calculation.
Regards.
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Santiago MÁRQUEZ DAMIÁN, Ph.D. Research Scientist Research Center for Computational Methods (CIMEC) - CONICET/UNL Tel: 54-342-4511594 Int. 7032 Colectora Ruta Nac. 168 / Paraje El Pozo (3000) Santa Fe - Argentina. http://www.cimec.org.ar |
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August 10, 2014, 00:37 |
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#4 |
Member
sajad
Join Date: Aug 2013
Posts: 70
Rep Power: 12 |
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August 13, 2014, 12:36 |
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#5 |
New Member
Simon
Join Date: Jun 2014
Posts: 9
Rep Power: 11 |
Hi Sajad,
As others have said there is a lot of prior work looking into these numerical effects. I've found the following very useful as a reference when using interFoam http://m.iopscience.iop.org/1749-469...014016/article You might find the time-step limits helpful in your problem, although they can be restrictive in terms of solve time - I would suggest starting with them to see if they help and then backing off to find a suitable compromise for your model. |
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