CFD Online Logo CFD Online URL
Home > Forums > CFX

Radiation Properties of MultiComponents

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

LinkBack Thread Tools Display Modes
Old   April 30, 2013, 14:43
Default Radiation Properties of MultiComponents
New Member
Join Date: Nov 2011
Posts: 10
Rep Power: 7
Cosme is on a distinguished road

I write to ask about the configuration of the radiation properties of a reactive mixture. I'm modeling internal flow combustion in a boiler, after selecting the turbulence model and define the emissivity of the walls, the program gives me this warning:

"In Analysis 'Flow Analysis 1' - Domain 'Default Domain': Radiation properties for the Mixtures 'reaction mixture' will be based on a mass weighted average of the constitutive components, Unless overridden with explicit Mixture Property settings."

Reading the CFX help I found that by default the program calculates the radiation properties through a weighted sum of its components, which computationally is not recommended (my simulation has 10 components).

I wonder who could give me recommendation to avoid this problem, or how to calculate these properties.

Cosme is offline   Reply With Quote

Old   April 30, 2013, 19:39
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 13,805
Rep Power: 107
ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
Unless you have a better model of what the mixture properties are then why not just accept the default?
ghorrocks is offline   Reply With Quote

Old   May 1, 2013, 22:19
Senior Member
Join Date: Feb 2011
Location: Earth (Land portion)
Posts: 666
Rep Power: 13
evcelica is on a distinguished road
Right, I don't see why that would make it that much more computationally expensive. taking the average of 10 values is not hard far a computer to do considering all the other calculations its performing.
It has to do this for every other material property anyways, so whats the big deal?
evcelica is offline   Reply With Quote

Old   May 27, 2013, 11:35
New Member
Join Date: Nov 2011
Posts: 10
Rep Power: 7
Cosme is on a distinguished road

I thought these calculations represented a high computational cost.

Cosme is offline   Reply With Quote


cfx, mixture, multicomponents, properties, radiation

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
Modeling both radiation and convection on surfaces - Ansys Transient Thermal R13 s.mishra ANSYS 0 March 31, 2012 04:12
error message cuteapathy CFX 14 March 20, 2012 07:45
Constant velocity of the material Sas CFX 15 July 13, 2010 08:56
Multiphase radiation in CFX Luk_Fiz CFX 5 March 17, 2009 04:51
Two-Phase Buoyant Flow Issue Miguel Baritto CFX 4 August 31, 2006 12:02

All times are GMT -4. The time now is 11:14.