Shared surface between bodies for better meshing?

alxe · August 16, 2011, 03:44

Hi!

I am doing a model of a wind tunnel consisting of several different frozen bodies (since I want different types of mesh at different sections of the tunnel). The bodies lies exactly next to eachother but there are two surfaces between them, one for each body. I suspect I will run into problems in the meshing if the meshing at the boundaries between the bodies doesn't match so I would like to have a shared surface between two adjacent bodies. How do I make a surface shared? (And please tell me if I'm totally wrong about the mesh-matching)

Thanks!

-mAx- · August 16, 2011, 05:39

which software are you using?

alxe · August 16, 2011, 06:06

Right, forgot that. I'm using ansys CFX and doing the geometry in ansys DM.

PSYMN · August 17, 2011, 14:59

You have two choices...

You can have each zone meshed independently and let the solver sort it out... or you can have each zone mesh conformally (matching mesh).

If you have separate parts, it will mesh each independently.

If you want matching mesh, you must create a multibody part and drag and drop all the other parts into it.

Simon

alxe · August 17, 2011, 18:04

Quote:

Originally Posted by PSYMN

You have two choices...

You can have each zone meshed independently and let the solver sort it out... or you can have each zone mesh conformally (matching mesh).

If you have separate parts, it will mesh each independently.

If you want matching mesh, you must create a multibody part and drag and drop all the other parts into it.

Simon

Okay, thanks. If I do a multibody part, can I still vary between a hexahedral and tetrahedral mesh at the different parts of the body or do I have to have the same mesh-type all over the multipart body?

brunoc · August 18, 2011, 11:52

Quote:

Originally Posted by alxe

Okay, thanks. If I do a multibody part, can I still vary between a hexahedral and tetrahedral mesh at the different parts of the body or do I have to have the same mesh-type all over the multipart body?

Hi alxe,
You can have different mesh types on a multibody (conformal) mesh. All you need to do is create a different meshing method for each of your bodies (RMB on Mesh > Insert > Method) and them select the mesh method you want.

Cheers

August 16, 2011, 03:44	Shared surface between bodies for better meshing?	#1
alxe New Member Alexander Join Date: Aug 2011 Posts: 8 Rep Power: 14	Hi! I am doing a model of a wind tunnel consisting of several different frozen bodies (since I want different types of mesh at different sections of the tunnel). The bodies lies exactly next to eachother but there are two surfaces between them, one for each body. I suspect I will run into problems in the meshing if the meshing at the boundaries between the bodies doesn't match so I would like to have a shared surface between two adjacent bodies. How do I make a surface shared? (And please tell me if I'm totally wrong about the mesh-matching) Thanks!

August 16, 2011, 05:39		#2
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	which software are you using? __________________ In memory of my friend Hervé: CFD engineer & freerider

August 17, 2011, 14:59		#4
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	You have two choices... You can have each zone meshed independently and let the solver sort it out... or you can have each zone mesh conformally (matching mesh). If you have separate parts, it will mesh each independently. If you want matching mesh, you must create a multibody part and drag and drop all the other parts into it. Simon __________________ ----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey

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August 16, 2011, 06:06		#3
alxe New Member Alexander Join Date: Aug 2011 Posts: 8 Rep Power: 14	Right, forgot that. I'm using ansys CFX and doing the geometry in ansys DM.