I will try giving the command line arguments to simple.py. I have not been able to get postproc.py running on my machine. I am using paraview. What should I do to view the data in paraview?

I will also try with your suggested region definitions.

In the problem definition file, does the order all definitions matter? If yes, what should be the correct order? This is something that is not clear to me...

On Tuesday, September 20, 2016 at 2:09:21 PM UTC+2, Robert Cimrman wrote:
Not sure, but IMHO it has something to do with your region definitions. The
inlet and outlet regions contain the wall nodes, so there is no no-slip
condition in those nodes.


./simple.py pipe_flow_test_copy.py --save-regions-as-groups --solve-not
./postproc.py -b pipe_7f_long_regions.vtk --layout=row

You might want to change the wall region to:

     'select' : 'vertices of surface -f (r.Outlet +v r.Inlet)',

and apply the walls condition as the last one by naming it ebc_4, so that is is
lexicographically after the inlet and outlet ones.


On 09/19/2016 02:33 PM, Nikhil Vaidya wrote:
> Hello!
> I am solving for steady laminar flow through a pipe. The issue I am facing
> is the following:
> I have given a velocity boundary condition at the pipe inlet. For the
> outlet, I examined the following two cases:
> 1) Pressure boundary condition at outlet.
> 2) No boundary condition prescribed at outlet.
> For both cases, I get a strange jump in the velocity at the pipe outlet. In
> the attached files you can see the velocity and pressure plotted along the
> axis(from inlet to outlet) of the pipe. Why do I see a jump in the velocity
> for both cases? How do I specify outlet conditions in sfepy?
> Another observation that I have made is that for case 1, there is a jump in
> the pressure value at the outlet. In case 2, this pressure-jumps goes away.
> Best regards,
> Nikhil