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

inflation area with steps

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

Reply
 
LinkBack Thread Tools Display Modes
Old   December 3, 2007, 14:41
Default inflation area with steps
  #1
fat bug
Guest
 
Posts: n/a
Several small steps are included in flow axial direction due to diameter change.

I'm having a hard time adding inflation layers to these features.

To me, all these steps will cause local turbulence. Therefore, I'd like to inflate this area to get more accurate results. The mesher will freeze at "surface mesh" level. I'm going nowhere on this.

I'd appreciate any help!

  Reply With Quote

Old   December 3, 2007, 17:39
Default Re: inflation area with steps
  #2
Glenn Horrocks
Guest
 
Posts: n/a
Hi,

If you want to resolve the turbulence generation caused by little steps then you will need a very fine mesh in the area to fully resolve the flow in this area. If you do this you will then have a fine surface mesh to resolve the steps.

My guess is you are trying to put too large a mesh on the steps and that is why it is having problems generating the mesh.

Glenn Horrocks
  Reply With Quote

Old   December 4, 2007, 09:08
Default Re: inflation area with steps
  #3
fat bug
Guest
 
Posts: n/a
I did run a Geometry check and set the surface mesh size smaller then 1/5 the min sliver or edge length.

Without inflation, all the other meshing setup will work fine on this model. It will only stall when I add inflation layers.

I did try refining the mesh, it worked, however, the mesh file was huge.

Would I be able to refine the mesh locally and do a "fast" transition to minimize the file size?

Thanks!
  Reply With Quote

Old   December 4, 2007, 10:29
Default Re: inflation area with steps
  #4
CycLone
Guest
 
Posts: n/a
You can do this, but you'll lose all the detail of the flow through your "fast" transition. If this level of detail is indeed necessary, you'll need to have a very large mesh.

You might be able to slice your geometry into sweepable regions and use the sweep method on these instead (assuming you are using the Workbench Meshing App). Alternatively, use a structured meshing tool like ICEM CFD Hexa to craft a hex mesh that resolves your details more efficiently.

-CycLone
  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
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
Problem with reference area alfaben STAR-CCM+ 2 September 17, 2011 03:46
Non overlap area fractions saisanthoshm88 CFX 9 April 26, 2011 13:05
CFX Solver Memory Error mike CFX 1 March 19, 2008 08:22
Storing Surface Area of each cell in a file? Markus Alzon FLUENT 0 June 21, 2007 08:38


All times are GMT -4. The time now is 19:03.