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Cosme April 30, 2013 14:43

Radiation Properties of MultiComponents

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.


ghorrocks April 30, 2013 19:39

Unless you have a better model of what the mixture properties are then why not just accept the default?

evcelica May 1, 2013 22:19

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?

Cosme May 27, 2013 11:35


I thought these calculations represented a high computational cost.


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