Dear Essence!
    What version of fluent are you using, I tried it on 2021R2 and it still doesn't work? Also my radiation model is S2S model, what is your radiation model?
   If I use the DO radiation model,I can I can get the same results as you.Why is the radiant heat on the surface I'm interested in 0 in the S2S model, but there are results in the DO radiation model? Can I get results on the S2S model? Is it possible to get the radiant heat at the surface using UDF inside the S2S model?
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