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Select Inviscid under Model.

Click OK. This means the solver will neglect the viscous terms in the governing equations.

Define > Models > Energy

The energy equation needs to be turned on since this is a compressible flow where the energy equation is coupled to the continuity and momentum equations.

Make sure there is a check box next to Energy Equation and click OK.
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Define > Materials

Select air under Fluid materials. Under Properties, choose Ideal Gas next to Density. You should see the window expand. This means FLUENT uses the ideal gas equation of state to relate density to the static pressure and temperature.
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Click Change/Create. Close the window.

Define > Operating Conditions

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