> @User Pressure fluctuations on the wall are typically modulated by the outer region (the log region) of the boundary layer, not so much by the inner (viscous) sub-layer, indicating that the scales related with pressure are INERTIAL. The autocorrelations (which measure stochastic scales) are not representative. If you resolve the log-region accurately (regardless of the physics close to the wall), then you should obtain good mean values for pressure @User But I am not sure about this when there are ribs inside the pipe/channel, or am I wrong?