[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

[odellar]

Sorry all I've sorted it, I'd missed out a semicolon on one line

If someone could let me know how I delete this thread I'll get rid of it.

Thanks
Olie

[range_rover]

it will be helpfull to others if you specify where was the collan missing in the script

[deborahgomess]

It help me a lot! You have no idea!
I was missing a semicolon too! After a parenthesis when I set a nonuniform inlet value at the 0/alpha.air.org

Thank you!

[Gizazu]

Hi. I finally got the simulation working but i have a litlle problems with definition of delta T and courant number which sometimes send back an error during the process. Could you help me with this doubt? What possibly I´m doing wrong?

Another question is that I´m doing a 3D simulation but i can only see Ux and Uz during the calculation. Is that normal?

Please, somebody help me!!!


Regards

[kvk]

can you please tell me how did you solve the problem ?

[MoeCFD]

This article has helped me as well. I added semi colon after uniform ( );