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non-functional cylindricalInletVelocity

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Old   October 10, 2018, 06:23
Default non-functional cylindricalInletVelocity
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Zander Meiring
Join Date: Jul 2018
Posts: 15
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yambanshee is on a distinguished road
Good day,
I am at a loss to the magnitude of different issues I am getting with openFoam this week. In this case; I am trying to specify a rotating inlet to a 1/8th section of an axial flow fan. I am working in the rotating frame of reference, so would like my inlet velocity to be rotating about the axial direction (y direction in my case). The goal for now is to troubleshoot why my solution is diverging by analyzing a potentialFoam case, so only my U file is of importance. It is set up as such:


Code:
/*--------------------------------*- C++ -*----------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  5
     \\/     M anipulation  |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       volVectorField;
    location    "0";
    object      U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField   uniform (0 -10.96 0);

boundaryField
{
    inlet
    {
        type            cylindricalInletVelocity;
        origin          (0 0 0);
        axis            (0 1 0);
        radialVelocity  constant 0;
        axialVelocity   constant -10.96;
        rpm             constant 750;
        value           (0 0 0);
    }

    outlet
    {
        type            zeroGradient;
    }

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

    left
    {
        type            cyclicAMI;
    }

    right
    {
        type            cyclicAMI;
    }

    shroud
    {
        type            symmetry;
    }

    hub
    {
        type            symmetry;
    }
}

// ************************************************************************* //
As can be seen, the inlet velocity is a cylindricalInletVelocity. I have found that with my build, the keyword 'origin' seems to replace 'centre'. Upon looking at the boundary in paraview, it is revealed that the entire boundary has a 0 velocity (magnitude and components). Upon experimentation, it appears that the patch simply takes on what ever value is given for the 'value' field, and leaving this field out cases an error.


I'm at a loss for what to do here, so any help would be appreciated.


Regards
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