How can I activate the radiator boundary condition in FLUENT?

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Zahid Ahmed Qureshi

In the thermal boundary conditions, you can activate it. You would need to define internal and external emissivity, as well as the external radiation temperature. you can go through ANSYS-FLUENT manual for this.

https://www.afs.enea.it/project/neptunius/docs/fluent/html/ug/node478.htm

Good luck