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By default, the Surface emissivity ε (dimensionless), Surface transmissivity τd (dimensionless), and Surface specular transmissivity τs (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 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 can define temperature-dependent emissivity and transmissivities using the variable rad.T.
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By default, Surface emissivity ε (dimensionless), Surface transmissivity τd (dimensionless), and Surface specular transmissivity τs (dimensionless) use values From material.
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When Surface emissivity is User defined, enter a value or expression for the Surface emissivity ε. The wavelength is accessible 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 can use instead the User defined for each band option to avoid the evaluation of the average.
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When Surface transmissivity is User defined, enter a value or expression for the Surface transmissivity τd. The wavelength is accessible through the rad.lambda variable. Any expression set for the transmissivity is then averaged on each spectral band to obtain a piecewise constant transmissivity. If the average value of the transmissivity on each band is known, you can use instead the User defined for each band option to avoid the evaluation of the average.
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When Surface specular transmissivity is User defined, enter a value or expression for the Surface specular transmissivity τs. The wavelength is accessible through the rad.lambda variable. Any expression set for the specular transmissivity is then averaged on each spectral band to obtain a piecewise constant specular transmissivity. If the average value of the specular transmissivity on each band is known, you can use instead the User defined for each band option to avoid the evaluation of the average.
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When Surface emissivity is User defined for each band, enter a value for the Surface emissivity for each spectral band. Within a spectral band, each value is assumed to be independent of wavelength. By default, the same emissivity is defined on both sides. Select the Define 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 transmissivity is User defined for each band, enter a value for the Surface transmissivity for each spectral band. Within a spectral band, each value is assumed to be independent of wavelength. By default, the same transmissivity is defined on both sides. Select the Define surface transmissivity 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 specular transmissivity is User defined for each band, enter a value for the Surface specular transmissivity for each spectral band. Within a spectral band, each value is assumed to be independent of wavelength. By default, the same transmissivity is defined on both sides. Select the Define surface specular transmissivity 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 Discrete ordinates method is selected, the components of each discrete ordinate vector can be used in this expression. The syntax is name.sx, name.sy, and name.sz, where name is the name of the physics interface node. By default, the Radiation in Participating Media interface is rpm so rpm.sx, rpm.sy, and rpm.sz correspond to the components of discrete ordinate vectors.
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