For streamwise-periodic flows, the velocity field should be completely periodic. If a density-based solver is used to compute the periodic flow, the pressure field reported will be the actual pressure (which is not periodic). If the pressure-based solver is used, the pressure field reported will be the periodic pressure field of Equation 9.4-3. Figure 9.4.5 displays the periodic pressure field in the geometry of Figure 9.4.1.
If you specified a mass flow rate and had FLUENT calculate the pressure gradient, you can check the pressure gradient in the streamwise direction ( ) by looking at the current value for Pressure Gradient in the Periodic Conditions panel.