•
|
Keep the default value, Constant, to define a gray radiation model. In this case, the radiative properties (emissivity, absorption and scattering coefficients) have the same definition for all wavelengths. These properties can still depend on other quantities, in particular on the temperature.
|
•
|
Select Solar and ambient to define a spectral radiation model with two spectral bands, one for short wavelengths, [0, λsol/amb], (solar radiation) and one for large wavelengths, [λsol/amb, +∞[, (ambient radiation). It is then possible to define the Separation point between spectral bands (SI unit: m), λsol/amb, to adjust the wavelength intervals corresponding to the solar and ambient radiation. The radiative properties can then be defined for each spectral band.
|
•
|
Select Multiple spectral bands and set the value of the Right endpoint for each spectral band in the table, to define a spectral radiation model. These values should be set in an ascending order. The value of the Left endpoint for the next spectral band is updated in consequence. It is then possible to provide a definition of the radiative properties for each spectral band.
|
The first Left endpoint and the last Right endpoint are predefined and equal to 0 and +∞, respectively.
|
•
|
When Discrete ordinates method is selected, Opaque Surface (Radiation in Participating Medium and Radiation in Absorbing-Scattering Medium Interfaces) and Continuity on Interior Boundary (Radiation in Participating Medium and Radiation in Absorbing-Scattering Medium Interfaces) are automatically added as default boundary features. The Incident Intensity (Radiation in Participating Medium and Radiation in Absorbing-Scattering Medium Interfaces) and Periodic Condition (Radiation in Participating Medium and Radiation in Absorbing-Scattering Medium Interfaces) features are made available from the Physics ribbon toolbar (Windows users), Physics context menu (Mac or Linux users), or the context menu (all users).
|
•
|
When P1 approximation is selected, Opaque Surface (Radiation in Participating Medium and Radiation in Absorbing-Scattering Medium Interfaces) is automatically added as a default boundary feature. The Incident Intensity (Radiation in Participating Medium and Radiation in Absorbing-Scattering Medium Interfaces), Periodic Condition (Radiation in Participating Medium and Radiation in Absorbing-Scattering Medium Interfaces), and Symmetry (Radiation in Participating Medium and Radiation in Absorbing-Scattering Medium Interfaces) features are made available from the Physics ribbon toolbar (Windows users), Physics context menu (Mac or Linux users), or the context menu (all users). Continuity on Interior Boundary (Radiation in Participating Medium and Radiation in Absorbing-Scattering Medium Interfaces) is not available.
|
The choice of Radiation discretization method also offers different settings for the Absorbing-Scattering Medium (Radiation in Absorbing-Scattering Medium Interface), Opaque Surface (Radiation in Participating Medium and Radiation in Absorbing-Scattering Medium Interfaces), and Incident Intensity (Radiation in Participating Medium and Radiation in Absorbing-Scattering Medium Interfaces) nodes.
|
•
|
The Level Symmetric Even (the default), Level Symmetric Hybrid, and Equal Weight Odd sets are SN approximations. Depending on the set and the order selected in the Discrete ordinates method list, different moment conditions are satisfied. In 3D, S2, S4, S6, and S8 generate 8, 24, 48, and 80 directions, respectively. In 2D, S2, S4, S6, and S8 generate 4, 12, 24, and 40 directions, respectively.
|
•
|
The Quasi-uniform weight approximation discretizes the angular space by using a reference octahedron with 8 triangular faces, further discretized in function of the order of the method. This corresponds to a TN approximation, for which 8N2weights are computed at order N.
|