[GAMBIT] Face boundary in 2d

flow_CH · July 10, 2013, 01:36

Hello.

I am modeling a 2d channel in Gambit. I have a face that air enters into the model. I am defining 5 edges for boundaries like wall and pressure inlet and pressure outlet and etc. But after defining the face for air, i can not export mesh for fluent. Is that possible to define face boundary in 2d model? see attached image ( Gambit error and geometry)

Thanks

Far · July 10, 2013, 04:28

No you cannot define face as boundary condition for 2d case. Give pressure condition to two outermost edges instead of four.

flow_CH · July 10, 2013, 04:37

Quote:

Originally Posted by Far

No you cannot define face as boundary condition for 2d case. Give pressure condition to two outermost edges instead of four.

You mean i erase two wall boundary edges and define that to pressure inlet boundary? if yes, since we are not defining the wall boundary then is the flow going out of model?

-mAx- · July 10, 2013, 04:47

don't set any BC to internal edge.
As Far explained, assign pressure inlet to both outer edges.
If you are running multiphase, you can use your air-face to initialise your vof. For that you need to assign your surface as another fluid domain

flow_CH · July 10, 2013, 04:50

Quote:

Originally Posted by -mAx-

don't set any BC to internal edge.
As Far explained, assign pressure inlet to both outer edges.
If you are running multiphase, you can use your air-face to initialise your vof. For that you need to assign your surface as another fluid domain

Yes. My model is multiphase. Can you explain more last sentence?
Thanks

-mAx- · July 10, 2013, 04:53

http://aerojet.engr.ucdavis.edu/gamb...zone_cont_type

Far · July 10, 2013, 05:01

yes. Define that wall edges as pressure inlet

flow_CH · July 12, 2013, 02:10

I Defined that wall edges as pressure inlet and tested 2d in my model . But in 2d i could not simulate that because every time the flow arrive that boundary, solution is converged!!! and flow not going to outlet (downstream)!!!!

Thanks

-mAx- · July 12, 2013, 03:29

sounds connectivity problem.
can you post picture of velocity contour (with mesh) on this area?

flow_CH · July 12, 2013, 03:55

Quote:

Originally Posted by -mAx-

sounds connectivity problem.
can you post picture of velocity contour (with mesh) on this area?

Thank you for your quick reply.
sounds connectivity problem? What is that?
I should say my continuity criteria for residuals is 0.001.
I will send pics for you in private.

July 10, 2013, 04:47		#4
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	don't set any BC to internal edge. As Far explained, assign pressure inlet to both outer edges. If you are running multiphase, you can use your air-face to initialise your vof. For that you need to assign your surface as another fluid domain __________________ In memory of my friend Hervé: CFD engineer & freerider

July 10, 2013, 04:53		#6
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	http://aerojet.engr.ucdavis.edu/gamb...zone_cont_type __________________ In memory of my friend Hervé: CFD engineer & freerider

July 12, 2013, 02:10		#8
flow_CH Senior Member FHydro Join Date: Jan 2013 Posts: 197 Rep Power: 13	I Defined that wall edges as pressure inlet and tested 2d in my model . But in 2d i could not simulate that because every time the flow arrive that boundary, solution is converged!!! and flow not going to outlet (downstream)!!!! Thanks Last edited by flow_CH; July 12, 2013 at 03:41.

July 12, 2013, 03:29		#9
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	sounds connectivity problem. can you post picture of velocity contour (with mesh) on this area? __________________ In memory of my friend Hervé: CFD engineer & freerider

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July 10, 2013, 04:28		#2
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	No you cannot define face as boundary condition for 2d case. Give pressure condition to two outermost edges instead of four.

July 10, 2013, 05:01		#7
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	yes. Define that wall edges as pressure inlet