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May 27, 2014, 06:43 |
interFoam channel hull parasitic currents?
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#1 |
New Member
Mirco Brunke
Join Date: May 2014
Location: Germany
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Hi Foamers,
this is my first post and i'm not sure if it is at the right place... and not so good in writing englisch... But my problem is: I use interFoam with OpenFoam 2.3. The case is a wind tunnel with two phases and a geometrie inside. Boundary conditions and all other settings are like the tutorial DTCHull in interDyMFoam but without moving mesh. There are only some changes at the velocity. It starts with 0 m/s and then speed up with 0.3m/s² for the whole area. The result shows, everywhere where the grid split into smaller cells are non-physical velocities near the surface in the air phase. The picture shows a sitution like this. This is the result after 0.1 seconds. So the velocity should be 0.03m/s. Is here anybody who knows what I did wrong or are these parasitic currents? Is there a trick to handle this problem? I changed a little bit the interFoam solver after seeing these results. But only at the pEqn.H like some people wrote here in the Forum for parasitic currents (Brackbill or Raeini). But I didn't test the complete code of Raeini. This changing had no effect. Greetings, Mock |
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June 8, 2014, 10:27 |
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#2 |
Retired Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
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Greetings Mock and welcome to the forum!
It looks to me that the mesh transition is in a very bad place. Have a look into this blog post of mine, so that you can get a better idea on how important the mesh is, specially "Case two": OpenFOAM: Interesting cases of bad meshes and bad initial conditions Best regards, Bruno
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August 9, 2014, 23:23 |
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#3 |
Senior Member
Santiago Marquez Damian
Join Date: Aug 2009
Location: Santa Fe, Santa Fe, Argentina
Posts: 452
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Hi, do you see these spikes at interphases?
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 11, 2014, 04:15 |
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#4 |
New Member
Mirco Brunke
Join Date: May 2014
Location: Germany
Posts: 2
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Hi santiagomarquezd,
these spikes are at the air-phase. Maybe a these pictures show it better: ErrorOverview.jpg ErrorOverview1s.jpg The red oval shows the location from the upper part of the picture (xz-plane). Best regards, Mock Last edited by Mock; August 11, 2014 at 07:05. |
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August 14, 2014, 19:26 |
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#5 |
Senior Member
Santiago Marquez Damian
Join Date: Aug 2009
Location: Santa Fe, Santa Fe, Argentina
Posts: 452
Rep Power: 23 |
As Bruno said, probably mesh problems.
Regards.
__________________
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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