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Select inletunder Compute Fromto tell FLUENT to use values at the pipe inlet for the reference values. Check that the reference value for density is 1 kg/m³, velocity is 1 m/s, and coefficient of viscosity is 2e-5 kg/m-s as given in the Problem Specification.These reference values will be used to non-dimensionalize the distance of the cell center from the wall to obtain the corresponding y+ values. Click OK.
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Let's plot y+ values for wall-adjacent cells to check how it compares with the recommendation mentioned above.

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Make sure that Position on X Axis is set under Options. Also, make sure that 1 is the value next to X, and 0 is the value next to Y and Z under Plot Direction. Recall that this tells FLUENT to plot the x-coordinate value on the abscissa of the graph. Pick Turbulence...under Y Axis Function and select Wall Yplus from the drop down list under that. Since we want the y+ value for cells adjacent to the wall of the pipe, choose wall under Surfaces.

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Click Plot.


Click here to see a higher resolution image. 
 
As we can see, the wall _y+_value is between 1.6 and 1.9 (ignoring the anamolous anomalous at the inlet). Since this is less than 5, the near-wall grid resolution is acceptable.

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