[GAMBIT] Boundary Layer without using Cooper scheme

Lilly · March 4, 2011, 06:25

Dear all,
does anybody know, whether it’s possible to create a boundary layer at the inner wall of a geometry, if I am not using the Cooper scheme to create my volume mesh? My problem is: I want to mesh the geometry of a vessel having a bifurcation. At this I want to create a boundary layer of hexahedral elements, because I need a good spatial resolution close to the wall. Afterwards I would like to fill up the rest of the geometry with tetrahedral or unstructured hexahedral elements. Unfortunately gambit refuses to mesh the surface via “Quad Map” or “Quad Submap” and due to the bifurcation I cannot use the Cooper scheme. Does anybody have an idea how I can get such a hexahedral boundary layer by using Gambit or Tgrid?
Thanks a million,
Lilly

-mAx- · March 4, 2011, 10:15

you can mesh your surface with tri, and your BL will be made of wedges.

Lilly · March 9, 2011, 10:07

Thank you for your help!
I tried to do so, but unfortunately the Boundary Layer only exists on the surface and the volume is filled up just with tets in this case...
Do you have any idea what I did wrong?
Thanks a million,
Lilly

-mAx- · March 9, 2011, 10:10

post pictures

Lilly · March 9, 2011, 10:48

I attached two pics that I shot in the "Examine Mesh" mode.

Thank you!
Lilly

-mAx- · March 9, 2011, 11:29

where did you apply the BL?

Lilly · March 17, 2011, 16:14

I see:I have to attach the Boundary Layer to the wall (face) of the geometry and not to the inlet and outlet edge.
It's working perfect now.
Thanks a million for your help, mAx!

March 4, 2011, 06:25	Boundary Layer without using Cooper scheme	#1
Lilly Senior Member Join Date: Feb 2011 Posts: 140 Rep Power: 15	Dear all, does anybody know, whether it’s possible to create a boundary layer at the inner wall of a geometry, if I am not using the Cooper scheme to create my volume mesh? My problem is: I want to mesh the geometry of a vessel having a bifurcation. At this I want to create a boundary layer of hexahedral elements, because I need a good spatial resolution close to the wall. Afterwards I would like to fill up the rest of the geometry with tetrahedral or unstructured hexahedral elements. Unfortunately gambit refuses to mesh the surface via “Quad Map” or “Quad Submap” and due to the bifurcation I cannot use the Cooper scheme. Does anybody have an idea how I can get such a hexahedral boundary layer by using Gambit or Tgrid? Thanks a million, Lilly

March 4, 2011, 10:15		#2
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	you can mesh your surface with tri, and your BL will be made of wedges. __________________ In memory of my friend Hervé: CFD engineer & freerider

March 9, 2011, 10:07	just tets in volume	#3
Lilly Senior Member Join Date: Feb 2011 Posts: 140 Rep Power: 15	Thank you for your help! I tried to do so, but unfortunately the Boundary Layer only exists on the surface and the volume is filled up just with tets in this case... Do you have any idea what I did wrong? Thanks a million, Lilly

March 9, 2011, 10:10		#4
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	post pictures __________________ In memory of my friend Hervé: CFD engineer & freerider

March 9, 2011, 11:29		#6
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	where did you apply the BL? __________________ In memory of my friend Hervé: CFD engineer & freerider Last edited by -mAx-; March 9, 2011 at 11:59.

March 17, 2011, 16:14		#7
Lilly Senior Member Join Date: Feb 2011 Posts: 140 Rep Power: 15	I see:I have to attach the Boundary Layer to the wall (face) of the geometry and not to the inlet and outlet edge. It's working perfect now. Thanks a million for your help, mAx!

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