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

Radiative Transfer Equation

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 11, 2010, 14:49
Default Radiative Transfer Equation
  #1
New Member
 
Zoltán Hercz
Join Date: Sep 2009
Posts: 17
Rep Power: 7
zmester is on a distinguished road
Hi

Those who ever used the radiation modelling features in fluent, or know from elsewhere the Radiative Transfer Equation, please help me.

from the fluent theory guide:


I understand that the 1st term on the right hand side is the normal intensity of a plate perpendicular to the beam and its temperature is the same as the temperature of the medium in that point.

I also understand that the sigma*t^4 is the total emission of the black body, and the normal intensity of the black body is the totalemission/pi in 3D. it comes from Lambert's law that states that intensity=normalintensity*cos(alfa).

But using this law in 2d, the normalintensity=totalemission/2
Am I right ?
So in case of 2d simulation, in the equation below sigam*T^4, 2 should be instead of pi.
Please explain it. I want to use Discret ordinate model in a 2d simulation.

Last edited by zmester; April 12, 2010 at 13:15.
zmester is offline   Reply With Quote

Old   April 13, 2010, 15:02
Default
  #2
New Member
 
Zoltán Hercz
Join Date: Sep 2009
Posts: 17
Rep Power: 7
zmester is on a distinguished road
___________________________________?
zmester is offline   Reply With Quote

Old   May 1, 2010, 09:24
Default
  #3
New Member
 
Zoltán Hercz
Join Date: Sep 2009
Posts: 17
Rep Power: 7
zmester is on a distinguished road
Other question also arisen in me. Dont you know why it is necessary to give both theta and phi numbers for angular discretization in 2d (fluent)? I think angular discretization should be possible with just one. In 2d we have angle intead of solid angle.
thanks

Last edited by zmester; May 2, 2010 at 20:35.
zmester 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Calculation of the Governing Equations Mihail CFX 7 September 7, 2014 06:27
mass flow in is not equal to mass flow out saii CFX 2 September 18, 2009 08:07
Turbulent Heat Transfer Transport Equation Flo.duck Main CFD Forum 0 May 6, 2009 03:37
Mass transfer Term in Mixture Energy Equation CFDtoy Main CFD Forum 0 July 3, 2008 16:14
radiative heat transfer Tim FLUENT 0 February 20, 2004 14:28


All times are GMT -4. The time now is 21:10.