For incompressible flow, the pressure used by OpenFOAM and shown in Paraview is actually a 'kinematic pressure', p/rho. Could this be the source of the discrepancy?Crossleyuk wrote: ↑Tue Apr 16, 2019 6:51 pmHi Again,
Lessons moving on great now and greater understanding generation questions starting to be required. I have a static/atmospheric pressure interpretation problem following some forum searches.
I'm setting an inlet pressure of 0Pa and an exit pressure of -1500Pa, i.e. a negative depression relative to atmospheric. FreeCAD and Paraview don't seem to be interpreting this in the way I expected. I am not obtaining my stated negative exit pressure relative to atmospheric.
Is there a "standard" pressure set by FreeCAD? is my -1500Pa being taken as less than a standard pressure rather than negative to atmospheric pressure?
Many thanks in anticipation again.
Can you post a model? Please in detail. What do you want to calculate?Crossleyuk wrote: ↑Tue Apr 16, 2019 8:19 pmThanks Oliver,
I see that will clarify the magnitude of the reported value so it's very valuable, but not it's value relative to atmospheric pressure. If I have the outlet connected to the inlet of a fan it should be approaching a depression, below atmospheric pressure (1500Pa gauge). I need to obtain a static pressure drop between inlet and outlet with no reference to any dynamic pressure terms. What I'm looking to obtain is the average static gauge pressure over the entire face of the outlet (exit). Thanks though, I actually have a further flow section to add to the model, so I'll take another look in the morning and apply your suggestion.