[buckngnr11]

I'm trying to include some very simple radiation in my computation. I'm reading through the different models but I'm not sure which is best to use for what I want. I have a conjugate simulation and one of my external boundaries is exposed to the environment. I'd like to include radiation from that surface (I know the emissivity of the surface) to the surroundings. I'm not sure which is best, and I know in some other CFD packages you can specify a surroundings temperature. I don't see this is 2019R2 Fluent. Thanks for your help!

[vinerm]

A radiation model is used only if radiation is to be modeled within the domain. If you want to model the effect of the incident radiation on the external boundaries of the domain, then you don't need a radiation model, only a radiation boundary. Just enable it for wall and provide the wall emissivity and radiation temperature.