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The default option for the Radiative Source node is Solid, which specifies that the heat source Q0 is defined in the material frame. Because the radiation variables and equations are defined in the spatial frame, the inputs are internally converted Absorbing Medium (Radiative Beam in Absorbing Medium Interface)to the spatial frame. See Conversion Between Material and Spatial Frames for details.
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The From material option uses the option selected in the Material type list of the Material Properties section of the material applied on the domain on which the node is active.
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For Power density enter a value for the power density Q0. When the Radiation discretization method is Discrete ordinates method, Q0 is divided by 4π to obtain the directional power density q0,j to be added in the radiative heat transfer equation. When the Wavelength dependence of radiative properties is Solar and ambient or Multiple spectral bands, the power density can also be User defined for each band, or set as a User defined distribution.
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For Directional power density (available when the Radiation discretization method is Discrete ordinates method) enter directly a value for the directional power density q0,j. When the Wavelength dependence of radiative properties is Solar and ambient or Multiple spectral bands, the directional power density can also be User defined for each band, or set as a User defined distribution.
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For Energy rate enter a value for the energy rate P0. In this case Q0 = P0⁄V, where V is the total volume of the selected domains. When the Radiation discretization method is Discrete ordinates method, Q0 is divided by 4π to obtain the directional power density q0,j to be added in the radiative heat transfer equation. When the Wavelength dependence of radiative properties is Solar and ambient or Multiple spectral bands, the energy rate can also be User defined for each band, or set as a User defined distribution.
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