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Double click on air and change Density to 1.0 kg/m^3 and Viscosity to 2e-5 kg/(m*s). These are the values in the Problem Specification. We'll take both as constant.

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Choose inlet and click on Edit.... Change the Velocity Specification Method to Magnitude, Normal to Boundary. Enter 1 m/sfor Velocity Magnitude. This indicates that the fluid is coming in normal to the inlet at the rate of 1 meter per second. Select Intensity and Hydraulic Diameter next to the Turbulence Specification Method. Then enter 1 1% for Turbulence Intensity and 0.22m for Hydraulic Diameter. Click OK to set the velocityboundary conditions for the inlet.

 
The (absolute) pressure at the outlet is 1 atm. Since the operating pressure is set to 1 atm, the outlet gauge pressure = outlet absolute pressure - operating pressure = 0. Choose outlet under Zone. The Type of this boundary is pressure-outlet. Click on Edit. The default value of the Gauge Pressure is 0. Click Cancel to leave the defaults in place.

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