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Barney July 24, 2006 04:24

Radiation - WSGGM + Soot

I'm simulation a methane combustion. so i took the multi-grey methane radiation templet for radiation modelling. But how can i include the radiation effects of soot. I have a temperature dependend formulare but no weight coefficients. If i set the radiation properties at the material properties, they are ignored by the multi grey gases. Can somebody help me?

opaque July 24, 2006 09:02

Re: Radiation - WSGGM + Soot
Dear Barney,

You must modify the template to add the soot radiation properties..

I do not have the soot coefficients for the CFX template; however, the required modifications require the soot volume fraction, soot density, and those coefficients.

Take a look at

Dr. Rubini is stil active and may be able to provide you with additional properties information. Then, it is up to you to add them to the CFX template.. He can be contacted at

Dr Phil A. Rubini

Head of Computational Flows and Combustion Group

Cranfield University

Beds MK43 0AL, UK

Tel: +44 (0) 1234 754649

Fax: +44 (0) 1234 750728


Good luck,


Barney July 26, 2006 02:27

Re: Radiation - WSGGM + Soot
Hi opaque,

do you know the difference between Multigrey and WSGGM?

opaque July 26, 2006 07:35

Re: Radiation - WSGGM + Soot
Dear Barney,

They are exactly the same model.. Former CFX-4.x users were used to the Multigrey name; however, standard literature refers to it as Weighted Sum of Gray Gases.. It is just a convenience for the transition..Multigrey may go away in future releases.

Did you find the information for soot?

Good luck,


Barney July 27, 2006 09:09

Re: Radiation - WSGGM + Soot
Dear opaque,

Thanks for explanation.

Unfortunately I got no response from Dr. Rubini yet.

Best Regards,


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