The Material Editor is used to create additional materials not supplied with the software. There are four basic properties that are necessary to define a solid for use with Autodesk® Simulation CFD. Most of these properties can vary with temperature, pressure or scalar, in several different . These properties and methods are listed in the following table:
|Conductivity -- the same value for thermal conductivity can be used for all three directions, or each component can be different.|
Constant, Polynomial, Inverse Polynomial, Piecewise Linear.
Y and Z directions also have: Same as X-Dir.
|Density -- only needed for transient analyses.||Constant, Polynomial, Inverse Polynomial, Piecewise Linear.|
|Specific Heat -- only needed for transient analyses.||Constant, Polynomial, Inverse Polynomial, Piecewise Linear.|
|Emissivity -- useful for radiation analyses. The emissivity specified on a solid will override the value assigned to contacting fluid.||Constant, Piecewise Linear variation with temperature (useful for specrowal radiation analyses.)|
|Transmissivity -- useful for radiation analyses; see note below||Constant, Piecewise Linear variation with temperature|
|ElectricalResistivity -- only needed for Joule heating analyses.||Constant, Polynomial, Inverse Polynomial, Piecewise Linear (varies with temperature).|
|Wall Roughness -- useful for applying variable roughness height to include effects of friction||Constant. Please see section about Wall Roughness.|
Transmissivity is a measure of how much radiative energy can pass through an object. A value of 1 indicates that the object is completely transparent, and that radiative energy can pass completely through it. A value of 0 means that the object is opaque. The permissible range of Transmissivity values is between 0 and 1.
Surface parts cannot be used to simulate transparent media. A non-zero value of transmissivity applied to surface parts will be ignored. Likewise, non-zero values of transparency assigned to moving solids are ignored--transparency is not supported for moving solids or within rotating regions.