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

CFX-mesh for a long pipe

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 22, 2005, 12:54
Default CFX-mesh for a long pipe
  #1
Julian
Guest
 
Posts: n/a
I am investigating the potential for CFX to model a variety of multiphase flows and have more familiarity with cfx-mesh than I do with ICEM. The problem is this:

The pipe is 10m long and 0.08m diameter. I can easily mesh the ends of the pipe extrude the mesh axially to give cells that are aligned in the direction of flow. However, my version of CFX (currently 5.7.1) will only allow me to extrude up to 100 layers maximum. This means that my cells are 0.1m long, which is fine for stratified flow, but no good for slug or bubbly flow.

Is there a user variable that I can tweak to allow me to have more cells in the axial direction, i.e. can I override the default setting for the number of layers?
  Reply With Quote

Old   September 22, 2005, 19:30
Default Re: CFX-mesh for a long pipe
  #2
Glenn Horrocks
Guest
 
Posts: n/a
Hi,

Can you extrude in two or more sub-sections and join them up? Also you might consider a structured mesh with ICEM-hexa.

Regards, Glenn Horrocks
  Reply With Quote

Old   September 26, 2005, 04:10
Default Re: CFX-mesh for a long pipe
  #3
Julian
Guest
 
Posts: n/a
Yes the extrude in sections and then join up is an option, though one that will probably leave me with unmatched boundaries every metre (though that itself will be an interesting test.)

As I said initially, I am not that familiar with ICEM and the battle that it will be to get the program to work just for a pipe is not on that I look forward to, though it is starting to appear that it might be the only way out.

Thanks for the coments, Julian
  Reply With Quote

Old   September 26, 2005, 23:23
Default Re: CFX-mesh for a long pipe
  #4
Glenn Horrocks
Guest
 
Posts: n/a
Hi,

Don't forget you can rotate, scale, stretch and copy meshed items in CFX-Pre. That means you might be able to assemble your pipe geoemtry from smaller bits. If you extrude and sweep each bit from the same cross section mesh then the mesh will match up between segments and you will not need unmatched boundaries. Even though your mesh is composed of smaller mesh fragments they will still be one domain with no interfaces.

Regards, Glenn Horrocks
  Reply With Quote

Old   September 27, 2005, 04:19
Default Re: CFX-mesh for a long pipe
  #5
Julian
Guest
 
Posts: n/a
Thanks, I didn't know that. Julian
  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
Missing math.h header Travis FLUENT 4 January 15, 2009 12:48
Problem with meshing long, thin faces in CFX Martin CFX 3 January 8, 2009 21:51
fluent add additional zones for the mesh file SSL FLUENT 2 January 26, 2008 12:55
CFX mesh & ICEM mike CFX 3 April 27, 2006 15:27
Meshing divergent nozzle entry of a long pipe Aly FLUENT 1 September 25, 2005 17:07


All times are GMT -4. The time now is 02:36.