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-   -   [ANSYS Meshing] long pipe mesh (http://www.cfd-online.com/Forums/ansys-meshing/105785-long-pipe-mesh.html)

trinitron August 9, 2012 03:58

long pipe mesh
 
I have a long pipe which has narrow cross section.
I need a mesh that must be narrow at cross section and long in pipe length.
actually I need a cube mesh which has tall length and short width.
pls help me.
software: ANSYS 12

nitinbansal184 August 13, 2012 06:07

Quote:

Originally Posted by trinitron (Post 376134)
I have a long pipe which has narrow cross section.
I need a mesh that must be narrow at cross section and long in pipe length.
actually I need a cube mesh which has tall length and short width.
pls help me.
software: ANSYS 12

Can you more specific Need Files

trinitron August 16, 2012 01:48

Quote:

Originally Posted by nitinbansal184 (Post 376773)
Can you more specific Need Files

what kind of files?

nitinbansal184 August 16, 2012 04:46

.tin and prj files

trinitron August 17, 2012 04:09

2 Attachment(s)
Quote:

Originally Posted by nitinbansal184 (Post 377315)
.tin and prj files

let to explain with picture:
attached figures show my mesh and desired mesh.
if I use "my mesh", since the pipe is long (10 m) the number of mesh become too high. so I want the mesh like "desired mesh".
Can you help me about this?
--------------------------------
I only have these files:
.cfx-.def-.out-.res

jrunsten August 17, 2012 04:29

If you are meshing in workbench, and the tube is indeed just a tube, then you can select a face at a short end and insert "mapped face meshing"

See http://img401.imageshack.us/img401/7...0817092223.png

trinitron August 17, 2012 10:29

1 Attachment(s)
Quote:

Originally Posted by jrunsten (Post 377453)
If you are meshing in workbench, and the tube is indeed just a tube, then you can select a face at a short end and insert "mapped face meshing"

See http://img401.imageshack.us/img401/7...0817092223.png

yes I work in workbench
thank you so much
I try mapped face meshing but the final mesh become like attached file(mesh.png). Not to "desired mesh".
Is there any way?

jrunsten August 17, 2012 10:38

Increase the number of cells in radial direction. It's in the image i posted as well.

trinitron August 17, 2012 10:57

1 Attachment(s)
Quote:

Originally Posted by jrunsten (Post 377498)
Increase the number of cells in radial direction. It's in the image i posted as well.

Your help is so useful.
but there is a problem which is still exist.
the elements on cross section are triangular, but I need rectangular mesh.
I attach the picture which shows triangular mesh on cross section.
If you look again to "desired mesh" picture in previous posts, you will see rectangular mesh Not triangular.

jrunsten August 17, 2012 11:07

Ah I see. Then just add a method, choose sweep and change "Free mesh type" to All Quad.

See images :

http://i.imgur.com/sA2am.png
http://i.imgur.com/nlyKo.png

EDIT: Just occured to me that inflation of the boundary layer might be difficult if you want to keep it an hex mesh. For some reason its a hard thing for workbench meshing to do.. ICEM does this easily btw

trinitron August 17, 2012 11:52

1 Attachment(s)
Quote:

Originally Posted by jrunsten (Post 377506)
Ah I see. Then just add a method, choose sweep and change "Free mesh type" to All Quad.

See images :

http://i.imgur.com/sA2am.png
http://i.imgur.com/nlyKo.png

I found the solution.
The mesh has been created normally.
thank Josef Runsten for your useful answers.

jrunsten August 20, 2012 03:48

Couldnt quite let this go, since I knew you wouldn't be able to get a hex mesh with inflation layers using that method. A way that will work, and that isn't that complicated, is to split the cylinder in quarters in Design Modeler, then use a Multizone meshing method. The right click on the method and choose "Inflate this method". Choose the inner and outer wall on the four inflation items and you should be good to go. See http://i.imgur.com/qf2DB.png , or http://www12.zippyshare.com/v/74996362/file.html for the archived project (v14).

If anyone know a better way, other than ICEM, I would be interested in knowing.

David2013 November 5, 2013 04:39

Hi Jrunsten,

I am having difficulties to successfully apply Multizone meshing with inflation to an object, which is half hollow cylinder and half hollow cone. I would appreciate if you share with me your archived examples.

Thank you.

ncwss_ncwss November 4, 2014 17:45

Quote:

Originally Posted by jrunsten (Post 377726)
Couldnt quite let this go, since I knew you wouldn't be able to get a hex mesh with inflation layers using that method. A way that will work, and that isn't that complicated, is to split the cylinder in quarters in Design Modeler, then use a Multizone meshing method. The right click on the method and choose "Inflate this method". Choose the inner and outer wall on the four inflation items and you should be good to go. See http://i.imgur.com/qf2DB.png , or http://www12.zippyshare.com/v/74996362/file.html for the archived project (v14).

If anyone know a better way, other than ICEM, I would be interested in knowing.

The archived project is expired.


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