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Models –› Radiation –› Edit

Note that when the DTRM, the S2S, or the DO model is activated, the Radiation Model dialog box
expands to show additional parameters. These parameters will not appear if you select one of the
other radiation models. If you are running a 3d case, you will have the added option of using the solar
load model. The solar load options will be displayed in the dialog box, below the radiation model
settings.

When the radiation model is active, the radiation fluxes will be included in the solution of the energy
equation at each iteration. If you set up a problem with the radiation model turned on, and you then
decide to turn it off completely, you must select the Off button in the Radiation Model dialog box.

7.4.1 Setting Up the DTRM

(a) Defining the Rays
When you select the Discrete Transfer model and click OK in the Radiation Model dialog box, the DTRM
Rays dialog box (Figure 13.3.2) will open automatically. (Should you need to modify the current
settings later in the problem setup or solution procedure, you can open this dialog box manually using
the Define/DTRM Rays... menu item.)

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