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

oil combustion

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 15, 2004, 05:51
Default oil combustion
  #1
Krishnarao
Guest
 
Posts: n/a
Hi I am solving oil combustion problem on CFX 5.7, in which I am facing problem of convergence.

a. I started with a timescale of 5 e-3, but problem was not converging even after 970 iterations.

b. I tried to keep a timescale of 1e-3, but mass and momentum residuals showed oscillations, so stopped solver.

c. I restarted the problem with timescale of 1e-3 for mass fractions and 5e-3 for global model. But still the convergence rate is very slow.

Can somebody suggest me some tips to improve the convergence in oil combustion or combustion related problems Thanks Krishnarao
  Reply With Quote

Old   November 16, 2004, 15:29
Default Re: oil combustion
  #2
tuki72@hotmail.com
Guest
 
Posts: n/a
Try lovering time step and then increase when runing...Sometimes the time step could be as low as 1e-8 [s]
  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
Oil combustion problem brajh11 CFX 1 December 7, 2012 02:49
Oil combustion brajh11 CFX 0 March 8, 2011 17:55
Non-premixed turbulent combustion of oil fuel Mary FLUENT 0 September 7, 2005 11:04
heavy fuel oil combustion imet FLUENT 0 April 11, 2005 03:57
how to heat the oil in pipe with combustion fume flyingcfd CFX 5 August 16, 2002 14:30


All times are GMT -4. The time now is 03:20.