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

Error message

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 27, 2012, 05:04
Default Error message
  #1
New Member
 
Amir sadeghi pour marvi
Join Date: Dec 2011
Posts: 25
Rep Power: 5
Prince of Persia is on a distinguished road
hi all
I am a new user for CFX so I might ask some stupid questions here. Sorry for that.
my question is when I run the simulation...I got the message:
turbulent viscosity limited to viscosity ratio of 1.000000e+005 in 1081594 cells
What should I do?
Prince of Persia is offline   Reply With Quote

Old   March 28, 2012, 10:49
Default
  #2
New Member
 
Snail
Join Date: Mar 2012
Posts: 9
Rep Power: 5
evswbok is on a distinguished road
change the viscosity ratio
evswbok is offline   Reply With Quote

Old   May 7, 2012, 02:15
Question How we can change viscosity ratio?
  #3
New Member
 
Himanshu Sharma
Join Date: May 2012
Posts: 8
Rep Power: 5
drhim86 is on a distinguished road
How can the viscosity ratio be changed in FLUENT 6.3?
drhim86 is offline   Reply With Quote

Old   May 7, 2012, 02:22
Default
  #4
Senior Member
 
Join Date: Mar 2009
Location: Indiana, US
Posts: 185
Rep Power: 8
delaneyluke is on a distinguished road
Reduce your under-relaxation parameters.
Which turbulence model are you using?

Regards
Luke
delaneyluke is offline   Reply With Quote

Old   May 7, 2012, 02:28
Default
  #5
New Member
 
Himanshu Sharma
Join Date: May 2012
Posts: 8
Rep Power: 5
drhim86 is on a distinguished road
I have used standard k-omega model and unsteady DES
drhim86 is offline   Reply With Quote

Old   May 7, 2012, 03:03
Default
  #6
Senior Member
 
Join Date: Mar 2009
Location: Indiana, US
Posts: 185
Rep Power: 8
delaneyluke is on a distinguished road
By unsteady DES, do you mean a transient simulation?

1) Try reducing your under relaxation factors
2) Start your simulation with the standard k-epsilon model and later switch to k-omega
3) If your run is transient, then try reducing your time step

regards
Luke
delaneyluke is offline   Reply With Quote

Old   May 7, 2012, 05:45
Unhappy Done all
  #7
New Member
 
Himanshu Sharma
Join Date: May 2012
Posts: 8
Rep Power: 5
drhim86 is on a distinguished road
Dear Mr. Luke,
As per your recommendations I have tried:

1) reducing under relaxation factors
2) Started simulation with the standard k-epsilon model but observed oscillations persisted
3) By running transient run solution diverged
Kindly acknowledge me with your suggestions
regards
Himanshu
drhim86 is offline   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



All times are GMT -4. The time now is 08:54.