Running flow sim of an exhaust system. Using porous medium as catalyst and evaluating velocity profiles right in front of porous medium (in Z direction only). I'm looking at a section plot 1 mm in front of the porous medium:
Plot scaling is set to min and max value of the plot itself 4.9 to 9.2
The face of medium is at z = -.0768. So plot would be at -.0778
So I'm then exporting z velocity values in all cells in z range of -.077 to -.078.
I assume it has to do with what cells I'm clipping in that range vs how plot files grab data in a single section plane. But I don't know where to find details on that to understand it.