Pressure drop between cross sections

Mauro

Hi all,

I am interested in measuring the total pressure drop along a pipe (air), between two normal cross sections, the first cross section (upstream) being interested by a strong recirculation. From the simulation I get a negative (!) pressure drop along the pipe. I would like to know whether if:

- it is simply due to a bad numerical simulation (insufficient grid resolution, thickness of the boundary layer cells) - it is related to a wrong choice of the averaging (the available one is an area-weighted total pressure, but I wonder if a density*velocity*area-weighted -- in analogy with the T_bulk definition -- should be applied) - the result could have a physical meaning (stagnation areas & viscous flow...) or be induced by the turbulence model (k-eps)

Similar topics had been already discussed somewhere in the forum, but I still have some doubts.

Thanks in advance