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

why did Time step is too small in stiffbs?

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 7, 2008, 20:46
Default why did Time step is too small in stiffbs?
  #1
satum
Guest
 
Posts: n/a
Hi, everyone. The following message appears when I activate the heat mass coupling in DPM panel. "Time step too small in stiffbs:

Time step too small in stiffbs: dt = 3.819282e-21, t = 4.316239e-04 0 y = 2.000002e-11 dy/dt = -1.075370e+03 1 y = 2.312000e+02 dy/dt = 0.000000e+00

Time step too small in stiffbs: dt = 3.589703e-21, t = 4.311432e-04 0 y = 2.000000e-11 dy/dt = -1.076570e+03 1 y = 2.312000e+02 dy/dt = 0.000000e+00

Time step too small in stiffbs: dt = 3.513279e-21, t = 4.311310e-04 0 y = 2.000002e-11 dy/dt = -1.076599e+03 1 y = 2.312000e+02 dy/dt = 0.000000e+00

Can you explain it?Thank you very much!

  Reply With Quote

Old   December 10, 2012, 10:15
Default
  #2
New Member
 
hityangsir's Avatar
 
Y. Yang
Join Date: Mar 2010
Location: Miami, United States
Posts: 28
Rep Power: 16
hityangsir is on a distinguished road
Hey, satum. I met the same problem. BTW, have you found the reason? Thank you
hityangsir is offline   Reply With Quote

Reply


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
Time step size and max iterations per time step pUl| FLUENT 31 October 23, 2020 23:50
SELECTING TIME STEP SIZE, NUMBER OF TIME STEP NITUL KALITA FLUENT 2 November 22, 2012 09:28
Time step too small in stiffbs Zhigang Hu FLUENT 1 September 22, 2007 07:55
Small time step and CFX solver crashing Vanessa CFX 2 June 21, 2006 10:18
Small physical time step Roued CFX 4 March 19, 2002 18:50


All times are GMT -4. The time now is 12:29.