If I alter the example file stabilized_navier_stokes.py to include an outflow boundary condition (in addition to its inflow) by adding the line:

   'Outlet_velocity' : ('Outlet', {'u.1' : -1.0, 'u.[0,2]' : 0.0}),

to the ebcs, then the oseen solver doesn't converge, and I get:

"warning: (almost) singular matrix! (estimated cond. number: 1.5e+19)"

Is there an issue using both inflow and outflow boundary conditions with the oseen solver?