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Select Print to Console and Plot under Options (these are the defaults). This will print as well plot the residuals as they are calculated which you will use to monitor convergence.

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We'll use an initial guess that is constant over the entire flow domain and equal to the values at the inlet:

Solution > Solution Initialization > Standard Initialization

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In the Solution Initialization menu that comes up, choose inlet under Compute From. The Axial Velocity for all cells will be set to 1 m/s, the Radial Velocity to 0 m/s and the Gauge Pressure to 0 Pa. The Turbulence Kinetic Energy and Dissipation Rate(scroll down to see it) values are set from the prescribed values for the Turbulence Intensity and Hydraulic Diameter at the inlet.

Click Initialize (this is easy to overlook).  Now every cell-center value for velocity components and pressure are set to the initial guess value.

This completes the problem specification. Save your project.

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In addition to the standard data quantities used in FLUENT, we would also like to view the results for the Skin Friction Coefficient. This quantity is not transferred to the post-processor by default; so we have to do it manually.

File Solution > Run Calculation > Data File Quantities

Under Additional Quantities, select Skin Friction Coefficient, which should be roughly half way down. Your window should now look like this:

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