[GAMBIT] axis Boundary conditions

sofie1 · September 4, 2011, 03:03

Hi
I need some help,how can i define the axis when it is out of domain in case of 2D annular flow in circular duct it is axsi symetric and the only mesh(annular domain ) is importes in fluent how can i do???

-mAx- · September 5, 2011, 02:09

good question...
*Did you try to import your mesh in the 2d-axisymetric solver?Check your solver's specifications for axis BC (for instance in Fluent it has to be x>0 and your domain should belong to xy postive quarter (x&y>0))
In this case if your domain is in (xy)>0 and no cells at y=0, maybe fluent will automatically treat it right (go and display your grid with symmetries to check if Fluent reflects your grid around x)

*I never tried it, but you can also try that: in 2d you can mesh a solid domain in which your axis will be meshed. Define the solid region as solid and export

*Else you can try a workaround by switching in 3d and using symmetries.

sofie1 · September 6, 2011, 02:42

thank you-mAx-
I think ,i'll try the second case with meshing the solid domain,i tried with importing mesh in the 2d-axisymetric solver but the results were wrong.

September 4, 2011, 03:03	axis Boundary conditions	#1
sofie1 Member sofia Join Date: Apr 2010 Location: world Posts: 31 Rep Power: 16	Hi I need some help,how can i define the axis when it is out of domain in case of 2D annular flow in circular duct it is axsi symetric and the only mesh(annular domain ) is importes in fluent how can i do???

September 5, 2011, 02:09		#2
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	good question... Did you try to import your mesh in the 2d-axisymetric solver?Check your solver's specifications for axis BC (for instance in Fluent it has to be x>0 and your domain should belong to xy postive quarter (x&y>0)) In this case if your domain is in (xy)>0 and no cells at y=0, maybe fluent will automatically treat it right (go and display your grid with symmetries to check if Fluent reflects your grid around x) I never tried it, but you can also try that: in 2d you can mesh a solid domain in which your axis will be meshed. Define the solid region as solid and export *Else you can try a workaround by switching in 3d and using symmetries. __________________ In memory of my friend Hervé: CFD engineer & freerider

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September 6, 2011, 02:42		#3
sofie1 Member sofia Join Date: Apr 2010 Location: world Posts: 31 Rep Power: 16	thank you-mAx- I think ,i'll try the second case with meshing the solid domain,i tried with importing mesh in the 2d-axisymetric solver but the results were wrong.