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You should have all the surfaces shown in the above snapshot.  Clicking on a surface name in the Mesh Display menu will toggle between select and unselect. Click Clicking Display to view will show all the currently selected surface entities in the graphics pane. Uselect Unselect all surfaces and then select each one in turn to see which part of the domain or boundary the particular surface entity corresponds to (you will need to zoom in/out and translate the model as you do this). For instance, the surface labeled heated_section should correspond to the part of the wall where heating occurs. 

Next, we specify that we want FLUENT to solve the axisymmetric form of the governing equations.
General > Solver > 2D Space > Axisymmetric

 
The energy equation is turned off by default. Turn on the energy equation.
Models > Energy - Off > Edit...
Turn on the Energy Equation and click OK.
 
By default, FLUENT will assume the flow is laminar. Let's tell it that our flow is turbulent rather than laminar and that we want to use the k-epsilon turbulence model to simulate our turbulent flow. This means FLUENT will solve for mean (i.e. Reynolds-averaged) quantities at every point in the domain and . It will add the k and epsilon equations to the governing equations as discussed in the powerpoint presentation. The k and epsilon equations are used to calculate the effect of the turbulent fluctuations on the mean, as discussed in the powerpoint presentation.

Models > Viscous - Laminar > Edit...

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