CFD Online Logo CFD Online URL
Home > Forums > FLUENT

What is the meaning.. ???

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

LinkBack Thread Tools Display Modes
Old   January 1, 2003, 15:21
Default What is the meaning.. ???
Posts: n/a
Hi all,

Happy New Year to Fluent-Users!!!

What is the meaning of the following Message:- "Turbulent Viscosity limited to viscosity ratio of 1.0e+5."

What is the implication? What action is to be taken in this case?

Waiting for reply.

With regards,

  Reply With Quote

Old   January 2, 2003, 05:51
Default Re: What is the meaning.. ???
Jinbok Yoo
Posts: n/a
1.0e+5 is set on solve/limit panel(you can change the limit values), and when the values of some cells exceed the limit value in the iteration, Fluent prints the message and replaces the exceeded values with the limit value.

  Reply With Quote

Old   January 3, 2003, 05:14
Default Re: What is the meaning.. ???
Posts: n/a
In that case usually u need to under reluxed the control criterion, decrease the URF and keep going.


  Reply With Quote

Old   January 4, 2003, 04:12
Default Re: What is the meaning.. ???
Posts: n/a
Dear Alamgir,

Thanx for reply. What is the implication of this? what does it physically mean? How much the URF to be decreased, Please give some guidelines for this.

  Reply With Quote

Old   January 5, 2003, 20:52
Default Re: What is the meaning.. ???
Posts: n/a
Ref: NUMERICAL HEAT TRANSFER AND FLUID FLOW-By S V Patankar. In this book u will have clear idea about ur 1st 2 questions. If u under relax that means u r taking that much quantiy from the past iteration. There is no hard and fast rule how much u need to decrease but every time decrease it by 1/2 and keep going upto 0.01. Remind if URF less u need more iterations to have converged results.

  Reply With Quote

Old   September 11, 2009, 10:01
Join Date: Jul 2009
Posts: 56
Rep Power: 9
bitak is on a distinguished road
I work on project about subsonic ejector like you.
My solve is :air - couple - axisymetric - k-e rng - pressure inlet and outlet ideal gas - my presure inlet are 150 ,250 ,350 ,450 Kpa and out let is atmosphere.
unfortunately my solve is divergence!!!!!!!!!
really I need to your help.
I change k-e to k-omega and pressure inlet to mass flow but devegence again.I know i have a shoke and so reverse flow in fluent.
bitak is offline   Reply With Quote


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
Physical meaning of pressure in pressure eqn dontknow Main CFD Forum 2 August 30, 2010 10:12
What's meaning of UDF FUNCTION zhaoxinyu Fluent UDF and Scheme Programming 0 March 31, 2010 08:04
what is the meaning of patching shyam FLUENT 1 July 29, 2008 06:25
want to know meaning Sangamesh CD-adapco 0 May 15, 2007 05:15
What's the meaning of "combustion scalar"and.... cfdbeginner CFX 0 November 27, 2003 10:02

All times are GMT -4. The time now is 18:58.