[Gopal_Åbo]

Q. How can I give different transmissivity with more than 3 wavelength region?

I used Discrete Ordinates (DO) Model since it is the only model with 'semi-transparent' and 'non-gray' mode.

I want to give material A (semi-transparent) transmissivity or emissivity like this:

ex) t=0.75 in 0 to 4 µm, or e = 0.25

t= 0.75 in 4 ~8 µm, or e = 0.25

t=0.75 in 8~14 µm, or e = 0.25
t = 0.0001 in 14 – 1000 µm, or e = 0.9999
(t is transmissivity), e = emissivity.
But when I change BC type of a material A from opaque to semi-transparent in boundary condition - radiation tab,
I made four bands, 0 – 4, 4 – 8, 8-14, 14-1000 µm in Model - Radiation - Number of Bands, but I could only change Direct / Diffuse Irradiation and Diffuse Fraction of each band, not transmissivity or emissivity of each band.

Please, someone can guide me, it would be a great help,
Is it possible to give each band different emissivity?