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I have this case (straight duct), where I need to measure pressure drop between 2 faceZones. For this, I was interpolating pressure onto these faceZones. When I try to run simpleFoam -postProcess to obtain pressure at these, I get different results if I run it at the last timestep or for all timesteps. For all timesteps it reports simply 0 (see pStart and pEnd from the log files below).