[odellar]

Hi,

If someone has answered this question before I apologise, but I've been searching for a long time across various forums and haven't managed to solve my problem.

I've got a geometry that is essentially an S-shaped pipe with one inlet and one outlet (both of which have the same surfaces area).

So I've set the inlet and outlet as patches, the 'top' and 'bottom' of the pipe as walls, and the 'front' and 'back' of the pipe as 'empty' since I just want a 2D solution.

I want a uniform inlet velocity of 1 m/s, and based on the continuity equation, the outlet velocity is 1 m/s as well (as it has the same surface area and my flow is incompressible).

I'm using a RAS k-epsilon solver.

This is where I have defined walls & patches etc in the blockMeshDict file:

boundary
(
    inlet
    {
        type patch;
        faces
        (
            (0 3 13 10)
        );
    }
    outlet
    {
        type patch;
        faces
        (
            (8 9 19 18)
        );
    }
    fixedWalls
    {
        type wall;
        faces
        (
            (3 2 12 13)
            (2 7 17 12)
            (7 6 16 17)
            (6 9 19 16)
            (0 1 11 10)
            (1 4 14 11)
            (4 5 15 14)
            (5 8 18 15)
        );
    }
);

(Note that I can view the geometry in ParaView and it looks correct so I don't think this is the issue).

This is where I have defined velocities (in 0/U):

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

internalField   uniform (0 0 0);

boundaryField
{
    inlet
    {
        type            fixedValue;
        value           uniform (1 0 0);
    }

    outlet
    {
        type            pressureInletOutletVelocity;
        value           uniform (0 0 0);
    }


    fixedWalls
    {
        type            fixedValue;
        value           uniform (0 0 0);
    }

    frontAndBack
    {
        type            empty;
    }
}

and this is where I have defined pressures:

dimensions      [0 2 -2 0 0 0 0];

internalField   uniform 0;

boundaryField
{
   

    inlet
    {
    type        zeroGradient;
    }

    outlet
    {
    type        zeroGradient;
    }

    fixedWalls
    {
        type            zeroGradient;
    }

    frontAndBack
    {
        type            empty;
    }
}

When I run pisoFoam it gives this error:

--> FOAM FATAL IO ERROR: 
Cannot find patchField entry for outlet

file: /home/olie/OpenFOAM/olie-2.2.1/run/tutorials/incompressible/pisoFoam/ras/s_shape/0/epsilon.boundaryField from line 26 to line 41.

I'm very new to OpenFOAM and wouldn't be at all surprised if I've just completely missed something.

Please ask if you'd like to see any of the other files, such as 0/epsilon or 0/k.

Thanks a lot for your time,
Olie