Chtmultiregionfoam + fvdom

Atieh.alizadeh · June 22, 2021, 07:46

i want to model the greenhouse effect in a solarchimney, i have considered the ambient air and i want to study the effects of the solar chimney on the ambient air
so i need to model the solar radiation and use FVDOM (to model the transparent parts )
how can i consider solar radiation in my model?

lumpor · June 22, 2021, 08:38

Have you looked at the solarBeamWithTrees tutorial? It uses both solarLoad and FvDOM, so it could lend some inspiration.

I don't think OF support for semi-transparent boundaries is all there yet. I don't know exactly what your setup looks like, but I think most of the changes you want to do can be done in boundaryRadiationProperties. There you can set different absorptivities and emissitivities for different wavelengths of boundaries, you can make boundaries transparent or opaque, and you can set separate conditions for solid-to-air and air-to-solid.

Atieh.alizadeh · June 22, 2021, 08:48

yes i have glass, concrete and earth
and the glass should have different absorption and transmission in different wavelenths

lumpor · June 22, 2021, 09:02

Setting aborptivity for different wavelengths can be done in boundaryRadiationProperties but wavelength-dependent transmissivity is not implemented from what I know. All the if clauses in the solarLoad code only check for transmissivity == 0, not transmissivity < 1, and they only check a single value for each face, not multiple values, which probably means that they don't store multple transmissivities for each face. You're probably going to have to make modifications in the radiation library.

June 22, 2021, 07:46	Chtmultiregionfoam + fvdom	#1
Atieh.alizadeh New Member Join Date: Jun 2021 Posts: 6 Rep Power: 5	i want to model the greenhouse effect in a solarchimney, i have considered the ambient air and i want to study the effects of the solar chimney on the ambient air so i need to model the solar radiation and use FVDOM (to model the transparent parts ) how can i consider solar radiation in my model?

June 22, 2021, 08:38		#2
lumpor Member Fabian Friberg Join Date: Dec 2020 Posts: 31 Rep Power: 6	Have you looked at the solarBeamWithTrees tutorial? It uses both solarLoad and FvDOM, so it could lend some inspiration. I don't think OF support for semi-transparent boundaries is all there yet. I don't know exactly what your setup looks like, but I think most of the changes you want to do can be done in boundaryRadiationProperties. There you can set different absorptivities and emissitivities for different wavelengths of boundaries, you can make boundaries transparent or opaque, and you can set separate conditions for solid-to-air and air-to-solid. Atieh.alizadeh likes this.

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June 22, 2021, 08:48		#3
Atieh.alizadeh New Member Join Date: Jun 2021 Posts: 6 Rep Power: 5	yes i have glass, concrete and earth and the glass should have different absorption and transmission in different wavelenths

June 22, 2021, 09:02		#4
lumpor Member Fabian Friberg Join Date: Dec 2020 Posts: 31 Rep Power: 6	Setting aborptivity for different wavelengths can be done in boundaryRadiationProperties but wavelength-dependent transmissivity is not implemented from what I know. All the if clauses in the solarLoad code only check for transmissivity == 0, not transmissivity < 1, and they only check a single value for each face, not multiple values, which probably means that they don't store multple transmissivities for each face. You're probably going to have to make modifications in the radiation library.