Thanks for the reply.

On Monday, October 3, 2016 at 12:04:01 PM UTC+2, Robert Cimrman wrote:

you will probably need some good preconditioning for this kind of problem, as
well as a good mesh. I have no expertise in this field.

In the sfepy manual on page: the interface contains the possibility to specify a preconditioner. Where can I find information regarding the right kind of preconditioner to use? I have seen that the other options for iterative solvers are PyAMG and PetSc4Py. I want to run SfePy on windows, and installing PETSc there is very problematic. In the file /tests/, there are no preconditioners specified for the PyAMG solver either. Is there anyone in your group who has experience with iterative solvers and preconditioners?

Best regards,

On 09/23/2016 01:50 PM, Nikhil Vaidya wrote:
> Hello,
> I am trying to solve a poiseuille flow example. I want to make use of the
> ls.scipy_iterative sovler. I am using the cg method. The problem definition
> file, mesh and the vtk output are attached. Also attached is a plot of the
> pressure and axial flow velocity along the axis of the pipe. As you can
> see, the solution is completely non-physical. The same case runs fine with
> the scipy_direct solver. What am I doing wrong?
> Best regards,
> Nikhil