Information on multiband radiation
 

Hello all,


I'm trying to incorporate (solar) radiation into one of my models and I'm a bit confused on the multiband setup.


Clearly in the viewFactorCoeffs subdict I can put in nBands 2. But where do I choose the frequency cutoffs for those bands?


Further in the solarLoadCoeffs model I see the tutorials have written:
spectralDistribution (2 1)


What exactly is this referring to? I can't find any notes about it in the source code, just that somehow it's describing the energy spectrum.


Anyone with any clues?


Thanks!

do you solved the problem?

I think it's simply the proportion between the different frequencies you have. If the distribution is (2 1) it means 2 thirds of the radiation is of the first frequency and one third of the radiation is of the second frequency.


Then in boundaryRadiationProperties you can specify the emissivity and aborptivity of the boundaries. For example emissivity ( 0.5 0.8) absorptivity ( 0.5 0.8 ) means that the patch absorbs and emits 50% of the energy from the first frequency band and 80% of the second one.


I don't think the actual frequency in Hz matters to the solver. You just make a mental note of which frequency each column represents.