[amrrhm]

I have a simple tube, which I am trying to benchmark a Poseuille flow with it. I have zero pressure gradient and some mass flow in inlet and a prescribed pressure at the outlet, and no slip at the walls. I measure the pressure at the inlet and I can compare that with analytical solution. When I use compressible flow there is no problem but when I use the incompressible flow the time steps drops to the minimum time step (1e-16s) and the pressures go crazy. Is there any problem with incompressible solver or I am missing something.
Thanks for your help.