[Gerrit]

Hi,

I am simulating flow in a pipe, but had to size down to a 2D model as I am limited by the computer power I have. The simulations are laminar simulations and I compared by velocity results with Hagen-Poiseuille flow. I do not get the correlation of U_max=2*U_av. Instead I get 1,5 for all my models.
I read that in Fluent it is possible to define asymmetric boundary conditions, to solve the flow still in 2D, but gain "correct" results.

Is this possible as well in OF?
My velocity boundary is defined as the following until now:

dimensions      [0 1 -1 0 0 0 0];

internalField   uniform (2 0 0);

boundaryField
{
    inlet
    {
        type            fixedValue;
    value           $internalField;
    }

    outlet
    {
        type            inletOutlet;
        inletValue      uniform (0 0 0);
        value           $internalField;
    }

    "(wall1|wall2|wire-upstream|wire-downstream|wire-north|wire-south)"
    {
        type            fixedValue;
        value           uniform (0 0 0);
    }

    "(bottom|top)"
    {
        type            empty;
    }

}

Is there any smart way for "bottom|top" which would give results closer to Hagen-Poiseuille? Or do I have to run it in 3D?

Thank you very much!
Best regards