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

turbulence model fr Core annular flow

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   November 6, 2007, 01:00
Default turbulence model fr Core annular flow
  #1
anup
Guest
 
Posts: n/a
i hv to simulate core annular flow(thus 2 immisible fluids, one flowing in the core of another) ....i m able to do it without turbulence. thr reynolds no is about 5000. which turbulence model should be the best ?
  Reply With Quote

Old   November 6, 2007, 01:07
Default Re: turbulence model fr Core annular flow
  #2
k.baker
Guest
 
Posts: n/a
try the k-epsilon model and use the VOF model for multiphase flow but you need also check your y+ for best wall treatment method.

K.Baker

  Reply With Quote

Old   November 6, 2007, 01:12
Default Re: turbulence model fr Core annular flow
  #3
anup
Guest
 
Posts: n/a
which k-e model to use?... and i hv used VOF model and how do we check the y+ for best wall treatment?
  Reply With Quote

Old   November 6, 2007, 01:30
Default Re: turbulence model fr Core annular flow
  #4
k.baker
Guest
 
Posts: n/a
the k-elsilon model one of models for turbulence you can use the standard or rng its best for multiphase flow siumlations. choosing wall treatment is important to improve your results near wall and this depend on the value of y+ (see the manual for more information about y+) but you cannot know the value of y+ before starting the simulation after the run is complete (at post-processing) you can draw a line or iso-surface at the wall then go to display contours then select turbulence>Wall Yplus then select the line or iso-surface you draw in the last step hence you will get the contours for Y+. Hence you can decide which the perfect choice for wall treatment as follows: 1) when you see y+<=5 you have to use enhanced wall treatment. 2) if your 30 <y+< 300 you can use either standard WF (wall functions) or non-equlibrium WF.

The second choice is better for multiphse flow.

Hope this be useful

k.baker

  Reply With Quote

Old   November 6, 2007, 01:32
Default Re: turbulence model fr Core annular flow
  #5
k.baker
Guest
 
Posts: n/a
the k-elsilon model one of models for turbulence you can use the standard or rng its best for multiphase flow siumlations. choosing wall treatment is important to improve your results near wall and this depend on the value of y+ (see the manual for mor
  Reply With Quote

Old   November 6, 2007, 02:54
Default Re: turbulence model fr Core annular flow
  #6
anup
Guest
 
Posts: n/a
thnk u a lot ... that was very helpful.. may i know what do u do ?
  Reply With Quote

Old   November 6, 2007, 13:58
Default Re: turbulence model fr Core annular flow
  #7
anup
Guest
 
Posts: n/a
plz help me .. i m not able to simulate core anuular flow .. ( i could only do it if i give the initial boundary condition of the inlet as a core of the fluid itself..otherwise if i give a mixture it forms just bubles n not CAF) ..plz gimme ur mail id
  Reply With Quote

Old   November 7, 2007, 01:42
Default Re: turbulence model fr Core annular flow
  #8
k.baker
Guest
 
Posts: n/a
hi anup unfortunately I work with stratified flow not annular so i cannot help you more sorry. K.Baker
  Reply With Quote

Old   November 7, 2007, 02:30
Default Re: turbulence model fr Core annular flow
  #9
anup
Guest
 
Posts: n/a
can i know abt u and ur occupation?
  Reply With Quote

Old   November 7, 2007, 02:51
Default Re: turbulence model fr Core annular flow
  #10
k.baker
Guest
 
Posts: n/a
How you know my occupation?
  Reply With Quote

Old   November 7, 2007, 02:52
Default Re: turbulence model fr Core annular flow
  #11
anup
Guest
 
Posts: n/a
i m asking your occupation dude
  Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Wrong calculation of nut in the kOmegaSST turbulence model FelixL OpenFOAM Bugs 27 March 27, 2012 09:02
Turbulence model for Laminar flow Terry Main CFD Forum 8 August 14, 2010 05:45
Code release: Flow Transition and Turbulence Chaoqun Liu Main CFD Forum 0 September 26, 2008 17:15
plz help on core annular flow Anup Kumar Roy FLUENT 1 October 8, 2007 08:47
Turbulence Model for flow between corotating disk Felipe FLUENT 0 January 10, 2004 12:01


All times are GMT -4. The time now is 08:50.