CFD Online Logo CFD Online URL
Home > Forums > FLUENT

benard convection

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

LinkBack Thread Tools Display Modes
Old   April 19, 2008, 15:22
Default benard convection
Posts: n/a
i am doing the simulation of benard convection in FLUENT. i am facing a problem and need a way out. i tried to plot the nusselt no variation with rayleigh no. to do that i first solved the energy equation only and found the total heat transfer rate ( report/fluxes/total heat tranfer rate /wall) . as expected it came exactly as a pure conduction heat tranfer rate. later i solved both flow and energy but contrary to expectation the heat transfer rate came much low. i expected it to be more than earlier as after rolls form Nu>1. i am consulting a book by E.L.Koschmieder which says for 1700<Ra<3000 , Nu~ 0.24 (Ra)^0.25. now i cant find a way to extract this data from plotting surface nusselt no did not gave me the expected result( i got a periodic plot with the min value 30 and max value 110 for Ra 2500,aspect ratio 2 case).
  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
benard convection samik FLUENT 0 April 2, 2008 16:41
Three dimensional Rayleigh-Benard Renato Main CFD Forum 0 December 9, 2005 13:32
convection......-> conduction......-> convection madasu FLUENT 3 November 24, 2002 02:15
Benard convection tantianyueke Main CFD Forum 0 August 2, 2001 09:47
convection dominated convection-diffusion problem Kang, S. K. Main CFD Forum 0 December 22, 2000 15:25

All times are GMT -4. The time now is 19:04.