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By default, the Surface emissivity ε (dimensionless) and Surface reflectivity ρs (dimensionless) use values From material. These are properties of the material surface that depend both on the material itself and the structure of the surface. Make sure that a material is defined at the boundary level (by default materials are defined at the domain level).
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For User defined, set values or expressions. You may set temperature-dependent emissivity and reflectivity through the use of the variable rad.T.
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By default, the Surface emissivity ε (dimensionless) and Surface reflectivity ρs (dimensionless) use values From material.
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When Surface reflectivity is set to User defined, enter a value or expression for the Surface reflectivity ρs. The wavelength may be accessed through the rad.lambda variable. Any expression set for the reflectivity is then averaged on each spectral band to obtain a piecewise constant reflectivity. If the average value of the reflectivity on each band is known, you may use instead the User defined for each band option to avoid the evaluation of the average.
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When Surface emissivity is set to User defined, enter a value or expression for the Surface emissivity ε. The wavelength may be accessed through the rad.lambda variable. Any expression set for the emissivity is then averaged on each spectral band to obtain a piecewise constant emissivity. If the average value of the emissivity on each band is known, you may use instead the User defined for each band option to avoid the evaluation of the average.
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When Surface emissivity is set to User defined for each band, enter a value for the Surface emissivity for each spectral band. Within a spectral band, each value is supposed to be wavelength-independent. By default, the same emissivity is defined on both sides. Select the Define initial surface emissivity on each side check box and fill the Upside and Downside columns of the table for a specific definition on each side.
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When Surface reflectivity is set to User defined for each band, enter a value for the Surface reflectivity for each spectral band. Within a spectral band, each value is supposed to be wavelength-independent. By default, the same reflectivity is defined on both sides. Select the Define initial surface reflectivity on each side check box and fill the Upside and Downside columns of the table for a specific definition on each side.
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