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13.3.10 Steps in Using the Radiation Models

The procedure for setting up and solving a radiation problem is outlined below, and described in detail in referenced sections. Steps that are relevant only for a particular radiation model are noted as such. Remember that the steps that are pertinent to radiation modeling, only, are shown here. For information about inputs related to other models that you are using in conjunction with radiation, see the appropriate sections for those models.

1.   Activate radiative heat transfer by selecting a radiation model ( Rosseland, P1, Discrete Transfer (DTRM), Surface to Surface (S2S), or Discrete Ordinates) under Model in the Radiation Model panel (Figure  13.3.14).

Note, select Off to deactivate radiation.

Define $\rightarrow$ Models $\rightarrow$ Radiation...

Figure 13.3.14: The Radiation Model Panel (DO Model)

2.   Set the appropriate radiation parameters.

(a)   If you are using the DTRM, define the ray tracing as described in Section  13.3.11.

(b)   If you are using the S2S model, compute or read the view factors as described in Section  13.3.12.

(c)   If you are using the DO model, choose DO/Energy Coupling if desired, define the angular discretization as described in Section  13.3.13 and, if relevant, define the non-gray radiation parameters as described in Section  13.3.13.

Note that when the DTRM, the S2S, or the DO model is activated, the Radiation Model panel 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 panel, below the radiation model settings.


The Rosseland model can be used only with the pressure-based solver.

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 panel.

Note that, when you enable a radiation model, FLUENT will automatically enable the energy equation so that step is not needed.

3.   Define the material properties as described in Section  13.3.14.

4.   Define the boundary conditions as described in Section  13.3.15. If your model contains a semi-transparent medium, see the information below on setting up semi-transparent media.

5.   Set the parameters that control the solution (DTRM, DO, S2S, and P-1 only) as described in Section  13.3.16.

6.   Iterate the solution as described in Section  13.3.16.

7.   Postprocess the results as described in Section  13.3.17.

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