CFD Online Logo CFD Online URL
Home > Forums > FLUENT

turbulent viscosity

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

LinkBack Thread Tools Display Modes
Old   May 22, 2007, 16:22
Default turbulent viscosity
Posts: n/a

what if the turbulent viscosity warning message persists until convergence but it's limited to few cells? is the solution still valid? would you suggest to adapt the grid cells where the turbulent viscosity is high? Thanks
  Reply With Quote

Old   May 25, 2007, 09:28
Default Re: turbulent viscosity
Brian Tang
Posts: n/a
I would say that it's a problem, even if limited to a few cells. The warning only appears when the turbulent viscosity hits unrealistic levels, so even cells that do not trigger the warning are likely to have overpredicted turbulent viscosity.

When you say "until convergence", is this from FLUENT's convergence criteria? If so, turn those off and continue to run the simulation until the residual history is flat and low for all variables. You will probably find if you examine the residual history, your turbulence residuals are still dropping and will be for some time yet (i.e., your solution is not actually converged yet).
  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
reversed flow at pressure inlet and turbulent viscosity is limited.... cfdiscool FLUENT 10 June 10, 2015 06:15
k-epsilon problem: non-physical turbulent viscosity production in coaxial free-jet Felipeb Main CFD Forum 1 July 26, 2010 17:02
Turbulent viscosity and shear rate shib FLUENT 0 June 22, 2010 12:44
setting value of turbulent intensity and turbulent viscosity ratio in wind tunnel nuimlabib Main CFD Forum 0 August 4, 2009 00:05
Problem of Turbulent Viscosity Ratio Limited David Yang FLUENT 3 June 3, 2002 06:13

All times are GMT -4. The time now is 09:20.