DO boundary Radiation Flux
 

Hello all,
I am modelising greenhouse climate and I need to use the DO model so I can change fluid properties depending on its coordinates. The problem is that Star CCM+ does not allow Radiation Flux Option on boundaries like it does with S2S. I need this feature so I can impose multiband radiation (Sun radiation) on the cover of the greenhouse (since Solar Loads are only with S2S).
My guess would be there's a way to enforce this condition with a User function...
I know would be easier to use Fluent that has solar model for DO radiation.
Thanks