Training Guide > Heat Transfer Tutorials > Transparent Fin Tutorial > Setting up the Radiation Model
Setting up the Radiation Model
Most of the models required in this case have already been selected (see Setting up the Models in the Heated Fin Tutorial) and so do not need to be specified again. The radiation model, however, does need to be changed.
- Open the Continua node, right-click on the Air node and select item
- In the Physics Model Selection dialog, deselect the Surface-to-Surface Radiation model.
- Select the Discrete Ordinate Radiation button in the Radiation group box.
The Physics Model Selection dialog should now look as shown below.
- Click Close.
- Select the Continua > Air > Models > Discrete Ordinate Radiation node.
- Change the Ordinate Sets property to . This setting gives the least accurate results but is also the fastest to run, so it is the most suitable for the purposes of this tutorial.
Since radiative heat transfer is to be modeled in the glass fin as well as in air, the radiation model must also be activated in the solid continuum. First, we will rename this continuum.
- Right-click the Continua > Aluminium Alloy node and select
- Change the name of the continuum to
Glass.
- Right-click the Glass node and select .
- In the Physics Model Selection dialog:
- Select the Radiation radio button in the Optional Physics Models group box.
- Select the Gray Thermal Radiation radio button in the Thermal Radiation group box.
- Select the Discrete Ordinate Radiation button in the Radiation group box.
The Physics Model Selection dialog should now look as shown below.
As for the Air continuum, the number of ordinate sets to be used by the model should be reduced.
- Select the Glass > Models > Discrete Ordinate Radiation node.
- Change the Ordinate Sets property to .
- Save the simulation by clicking on the
(Save) button.
The next stage in the tutorial is Setting Material Properties.
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