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

turbulent viscosity problem

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 6, 2006, 07:22
Default turbulent viscosity problem
  #1
majie023
Guest
 
Posts: n/a
In my caculation,it apprears the following information again and again:turbulent viscosity limited to viscosity ratio of 1.000000e+005 in 262718 cells.

And certainly it can't reach convergence even after 600 iterations.What's going wrong with it?
  Reply With Quote

Old   October 6, 2006, 15:40
Default Re: turbulent viscosity problem
  #2
Neelima
Guest
 
Posts: n/a
Hello,

I would recommend you to check whether you have scaled the grid properly when you first read the mesh into Fluent Solver.

Neelima
  Reply With Quote

Old   October 6, 2006, 20:12
Default Re: turbulent viscosity problem
  #3
majie023
Guest
 
Posts: n/a
Thanks for your help.

I am sure I have scaled the grid properly,but the problem still exits.I don't know what to do next.
  Reply With Quote

Old   October 6, 2006, 20:27
Default Re: turbulent viscosity problem
  #4
zxaar
Guest
 
Posts: n/a
initiate the calculation with very low value to k, (default init is 0.1), I usually use 0.0001. In most cases this would solve the problem.
  Reply With Quote

Old   October 7, 2006, 05:07
Default Re: turbulent viscosity problem
  #5
sam
Guest
 
Posts: n/a
as i guess this is problem due to ill posed boundary condition. are u sure abt ur BC?

  Reply With Quote

Old   October 9, 2006, 03:35
Default Re: turbulent viscosity problem
  #6
sach
Guest
 
Posts: n/a
check the following 1) this comes mailny due to mesh quality issue (skewness and aspect ratio) 2) it may go off after few thousand iteration 3)

let me know for any quary sachcool80@gmail.com
  Reply With Quote

Old   October 11, 2006, 21:40
Default Re: turbulent viscosity problem
  #7
mahendran.n
Guest
 
Posts: n/a
hello ,

increase the limit values in the solve menu ... this will solve the problem .. i used to do this when such a situation comes

mahendran
  Reply With Quote

Old   October 11, 2006, 21:42
Default Re: turbulent viscosity problem
  #8
mahendran.n
Guest
 
Posts: n/a
increase the limit values in the solve - controls - limits ... this will solve the problem .. i used to do this when such a situation comes

mahendran

  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 viscosity limited to viscosity ratio of 1.000000e+05 syler3321 FLUENT 4 March 16, 2012 17:00
RSM+2nd ordedr causes turbulent viscosity limited to viscosity ratio of.... khsiavash Main CFD Forum 7 October 19, 2011 06:21
User-defined turbulent viscosity - kinematic or dynamic? tstorm Main CFD Forum 4 January 29, 2010 11:08
setting value of turbulent intensity and turbulent viscosity ratio in wind tunnel nuimlabib Main CFD Forum 0 August 4, 2009 00:05
Modified turbulent viscosity Christoph Oehy CFX 4 April 27, 2000 22:06


All times are GMT -4. The time now is 11:22.