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

URGENT...natural convection

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 26, 2005, 12:49
Default URGENT...natural convection
  #1
alanna
Guest
 
Posts: n/a
HI!trying to carry out natural convection in a 2d rectangular cavity (100mm X 50mm. the solution will not converge. Using Boussinesq approximation. Rayleigh num is of the order of 10^7 so flow is laminar. Left wall appplied temperature of ninety degrees and right wall at 50....Have used suggested set up as in user tutorial and have altered under relaxation values but residuals wont converge!!Any tips PLease????
  Reply With Quote

Old   February 28, 2005, 21:59
Default Re: URGENT...natural convection
  #2
abong
Guest
 
Posts: n/a
try using ideal gas, lower under-relax factor.
  Reply With Quote

Old   March 1, 2005, 10:07
Default Re: URGENT...natural convection
  #3
alanna
Guest
 
Posts: n/a
Hi thanks for responding!im using water. Have tried lowering under-relaxation values but still wont converge. If you have any more advice please post it....need to finish this project soon
  Reply With Quote

Old   March 2, 2005, 12:46
Default Re: URGENT...natural convection
  #4
Evan Rosenbaum
Guest
 
Posts: n/a
Don't use Boussinesq. Define water as having density as a function of temperature (either a polynomial or piecewise linear).
  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
Natural Convection problem in Fluent - urgent NSV FLUENT 10 May 6, 2014 04:25
natural convection problem with radiation jorien CFX 0 October 14, 2011 09:26
Coupled vs Seg - Natural vs. Forced Convection Alex CD-adapco 5 December 12, 2007 05:58
natural convection at high Rayleigh mauricio FLUENT 2 February 23, 2005 20:43
Natural Convection, Urgent elyyan FLUENT 5 September 29, 2003 22:06


All times are GMT -4. The time now is 14:16.