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Old   June 5, 2004, 20:27
Default Radiation in CFX5
Jay Chang
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I have a model involved solid, fluid, radiation and heat conduction. I use CFX5 to solve it. But, I could not get good converged solution. RMS for most of the domains just stayed unchanged after several iterations and could not go lower than 1e-4, and the RMS for radiation even could not go lower than 1. I would highly appreciated it if someone could help me. I have been struggling at this problem for weeks. And, it seems that CFX support could not give me too much support at this problem. Thank you very much!
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Old   June 5, 2004, 21:27
Default Re: Radiation in CFX5
Juan Carlos
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Dear Jay,

From your description is not very clear what you are doing, for example:

1 - What kind of flow you have: laminar or turbulent, natural convection or forced convection driven.

2 - Solids? How many? Are they of many different materials with a wide spectrum of thermal conducticvities?

3 - Radiation? Which model are you using? If MonteCarlo, is there radiation in the solids? What is you optical thickness range, thin or thick?

4 - An RMS of 1.E-4 is not perfect, but it is not bad either. Then, there might a subtle physics or numerics issue which is not easy to infer from your description.

I would organize your available data and contact CFX support again.

Good luck, Juan Carlos
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