CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

2D in CFX 5.5 (2)

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   December 18, 2001, 18:06
Default 2D in CFX 5.5 (2)
  #1
Astrid
Guest
 
Posts: n/a
Hi all again,

In search of a route to a decent 2D-grid in CFX 5.5, the next chapter:

I have been able to create a suitable 2D-grid in CFX 5.5 using the MESH-only mode and the PATRAN-mesher. I exported the unstructured HEX-mesh in NEUTRAL format. Then I imported the grid again in CFX 5.5. Everthing works fine so far. However, somehow I am not able to define patches (e.g. inlets, walls). Not in the MESH-only PATRAN-mode (as the NEUTRAL-format does not contain patches) and not after I have imported the grid (as the imported grid remains frozen). Does anyone know how to define these?

Thanx for reading, Astrid
  Reply With Quote

Old   December 19, 2001, 00:22
Default Re: 2D in CFX 5.5 (2)
  #2
Robin Steed
Guest
 
Posts: n/a
Hi Astrid,

While you are in the Patran volume mesh mode, create mesh groups (using the groups feature) to define boundary patches. Then export your mesh.

Incidentally, you can make a really nice 2-D hex mesh using the paving tool, then extruding it. The same tool can also be used to sweep out a paved surface, along a pipe for instance.

Regards, Robin
  Reply With Quote

Old   December 19, 2001, 03:21
Default Re: 2D in CFX 5.5 (2)
  #3
Astrid
Guest
 
Posts: n/a
Hi Robin,

- Thank you for the tip. I will try it today.

- Indeed. I have created a nice 2D-unstructured hex-mesh on a symmetry plane and then extruded it in z-direction using the sweep tool. Step 2 is to associate the obtained volume mesh to the Solid. Interesting.....eh...... is it somehow possible to extrude a tet-mesh on a surface to a volume mesh with only prisms (wedge6)????

Thanx, Astrid
  Reply With Quote

Old   December 19, 2001, 20:59
Default Re: 2D in CFX 5.5 (2)
  #4
Robin Steed
Guest
 
Posts: n/a
Hi Astrid,

No need to associate it to a solid, just create the necessary mesh groups for your boundaries, then export the mesh in the Patran neutral format. You must then start a new database, selecting the "Import Mesh" feature this time.

Regards, Robin
  Reply With Quote

Old   December 20, 2001, 08:46
Default Re: 2D in CFX 5.5 (2)
  #5
Astrid
Guest
 
Posts: n/a
Hi Robin,

- It worked. Thanks a lot.

- You didn't answer my second question: can you extrude a tet surface mesh to a 2D wedge volume mesh?

Regs, Astrid
  Reply With Quote

Old   December 21, 2001, 01:09
Default Re: 2D in CFX 5.5 (2)
  #6
Robin Steed
Guest
 
Posts: n/a
Hi Astrid,

It is possible to do this. You will have to contact your technical support representative at CFX to get an additional meshing executable and setup details.

As far as the mesh goes, you can make a better quality mesh by doing exactly as you have done. The only advantage you will gain by creating a 2-D mesh with the CFX mesher is when adaption is used; if you use the automatic adaption on an imported mesh, it will not adapt to your geometry, whereas if you meshed it with the CFX mesher, new nodes at your boundaries will snap to the original geometry.

Best regards, Robin
  Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Transient animation performance in CFX 5.5 POST Sjoerd Romkes CFX 8 February 5, 2013 15:53
CFX 5.5 how to import? Marco CFX 4 November 14, 2004 17:40
Help: 2D model in CFX 5.5 Dejun Jing CFX 1 July 24, 2002 00:25
Please compare between CFX 5.5 and CFX 4.4 p CFX 2 April 8, 2002 16:43
CFX 5.5 Roued CFX 1 October 2, 2001 16:49


All times are GMT -4. The time now is 03:58.