[GAMBIT] how mwsh a connect cylinder

bob12 · October 13, 2009, 02:56

hi all,
i have a problem with a 3d mesh; i have two volume in my geometry the first is a cylinder and the second is another cylinder when the first is partially connect. i have connect the common face, and now when i'm going to mesh the first don't have problem but the second signal me error if use a cooper mesh. so what i do for mesh this second cylinder if i want mesh with cooper mesh system?

thank you for the attention

-mAx- · October 13, 2009, 04:10

*what do you mean with partially connect?
*what's the matter if you delete all the meshes and you try to mesh the second cylinder first?
*a picture of your 2 cylinders may help

bob12 · October 13, 2009, 07:36

this is the picture

Immagine1.bmp

-mAx- · October 13, 2009, 08:07

according to your schema, B isn't a cylinder.
Anyway, you may split your volume B with a plane (same location as the surface you mentionned). Take care that plane split all the volume, the split operation should give you 2 volumes: a real volume (left from the split-plane) and a annular cylinder (right from split plane).
Then for successfull meshing, you have to mesh in this order: cylinder A, annular cylinder, then B cylinder with taking all the right surfaces (already meshed) as source.

bob12 · October 13, 2009, 08:39

thank you for the answer i will try to do same as you indicate.
i have a another question after the mesh, will i go to connect the volume?
if no, are sufficient only two boundary condiction 1 flow in(for cylinder A) and 1 flow out (for anular volume create to split cylinder B) for all volume,that are three now?

-mAx- · October 13, 2009, 10:18

if you did the split as I mentionned, the volumes shoud be connected.
The BC you need to define, are the one for the entire domain (so don't look after subvolumes)

bob12 · October 14, 2009, 09:31

hi all
i try to do as you indicate, and it is all ok. i have a question if before i split the volume B , after i don't turn out connect the volume B with A.
also if i connect the volume A and B after i can't split volume B because the connection is a virtual with a t-junction.

-mAx- · October 15, 2009, 02:28

try to restart from beginning, and just split your volume, with the adequate plane.
Gambit should create 3 connected volumes

October 13, 2009, 02:56	how mwsh a connect cylinder	#1
bob12 Member Join Date: Oct 2009 Location: Italy Posts: 88 Rep Power: 16	hi all, i have a problem with a 3d mesh; i have two volume in my geometry the first is a cylinder and the second is another cylinder when the first is partially connect. i have connect the common face, and now when i'm going to mesh the first don't have problem but the second signal me error if use a cooper mesh. so what i do for mesh this second cylinder if i want mesh with cooper mesh system? thank you for the attention

October 13, 2009, 04:10		#2
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	what do you mean with partially connect? what's the matter if you delete all the meshes and you try to mesh the second cylinder first? *a picture of your 2 cylinders may help __________________ In memory of my friend Hervé: CFD engineer & freerider

October 13, 2009, 08:07		#4
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	according to your schema, B isn't a cylinder. Anyway, you may split your volume B with a plane (same location as the surface you mentionned). Take care that plane split all the volume, the split operation should give you 2 volumes: a real volume (left from the split-plane) and a annular cylinder (right from split plane). Then for successfull meshing, you have to mesh in this order: cylinder A, annular cylinder, then B cylinder with taking all the right surfaces (already meshed) as source. __________________ In memory of my friend Hervé: CFD engineer & freerider

October 13, 2009, 10:18		#6
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	if you did the split as I mentionned, the volumes shoud be connected. The BC you need to define, are the one for the entire domain (so don't look after subvolumes) __________________ In memory of my friend Hervé: CFD engineer & freerider

October 15, 2009, 02:28		#8
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	try to restart from beginning, and just split your volume, with the adequate plane. Gambit should create 3 connected volumes __________________ In memory of my friend Hervé: CFD engineer & freerider

October 13, 2009, 07:36		#3
bob12 Member Join Date: Oct 2009 Location: Italy Posts: 88 Rep Power: 16	this is the picture Immagine1.bmp

October 13, 2009, 08:39		#5
bob12 Member Join Date: Oct 2009 Location: Italy Posts: 88 Rep Power: 16	thank you for the answer i will try to do same as you indicate. i have a another question after the mesh, will i go to connect the volume? if no, are sufficient only two boundary condiction 1 flow in(for cylinder A) and 1 flow out (for anular volume create to split cylinder B) for all volume,that are three now?

October 14, 2009, 09:31		#7
bob12 Member Join Date: Oct 2009 Location: Italy Posts: 88 Rep Power: 16	hi all i try to do as you indicate, and it is all ok. i have a question if before i split the volume B , after i don't turn out connect the volume B with A. also if i connect the volume A and B after i can't split volume B because the connection is a virtual with a t-junction.

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