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

Turbulent Intensity too large!

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 2, 2008, 12:25
Default Turbulent Intensity too large!
  #1
donde
Guest
 
Posts: n/a
Fluent's modeling of duct incompressible flow shows turbulent intensity about I=100-400% in regions closed to the walls, in the vortex wake after central body and outlet jet. Turbulence model is k-epsilon. Mesh is rather fine (y+=3). Pressure inlet and outlet conditions are set to I=1% and hydraulics diameter=2m.

Would you help me?
  Reply With Quote

Old   October 2, 2008, 15:09
Default Re: Turbulent Intensity too large!
  #2
John S.
Guest
 
Posts: n/a
What kind of mesh are you analyzing?
  Reply With Quote

Old   October 2, 2008, 21:00
Default Re: Turbulent Intensity too large!
  #3
donde
Guest
 
Posts: n/a
Mesh generating fragments:

'undo begingroup' 'blayer create "bl_virtual_wall_3" first 0.0001 growth 1.2 total 0.0186688 \' 'rows 20 transition 1 trows 0 continuous' 'blayer attach "bl_virtual_wall_3" face "face_throat_1" edge "virtual_wall_3"' 'undo endgroup' ... 'face mesh "face_throat_1" triangle size 1' 'face mesh "face_throat_2" triangle size 1' 'face mesh "face_before_grid" triangle size 1' 'face mesh "face_grid" map size 1' 'face mesh "face_after_grid" map size 1' 'face mesh "face_camera" pave size 1' 'face mesh "face_dif" map size 1' 'face mesh "face_outlet" pave size 1'

  Reply With Quote

Old   October 4, 2008, 05:36
Default Re: Turbulent Intensity too large!
  #4
Friend
Guest
 
Posts: n/a
Hi,

May I suggest that you have a look into the reference values used in calculating the intensity as that may give you a clearer meaning of what that intensity means in your model.
  Reply With Quote

Old   October 20, 2008, 13:22
Default Re: Turbulent Intensity too large!
  #5
donde
Guest
 
Posts: n/a
Friend:

Thanks for the help!
  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
Turbulent Intensity John Haynes Main CFD Forum 2 December 24, 2008 04:07
Specifying turbulent intensity ken FLUENT 6 June 2, 2005 02:50
turbulent intensity zwdi FLUENT 4 June 24, 2004 04:57
what is turbulent intensity? LG.P FLUENT 2 February 12, 2002 11:55
Turbulent intensity and turbulent dissipation Phil FLUENT 1 September 1, 2000 07:05


All times are GMT -4. The time now is 01:10.