Summary:

THE PROBLEM IS COUSED BY NEUMANN EXTRAPOLATION OF PRESSURE GRADIENT AT BOUNDARIES

If I use a very similar mesh but that is unstructured at the inlet the problem is solved (actually this is what i did with Saturne 2.2.0). 
Is it possible to solve the problem using Extrapolation instad of Neumann (also with this structured mesh).

From the listing it is clear that there is no convergence of the pressure. The figure refers to the last time step (ntcabs=50)
