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boundaryWallFunctionsProfile allowable modifications for generation of 'y+'

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Old   July 14, 2019, 23:45
Default boundaryWallFunctionsProfile allowable modifications for generation of 'y+'
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Ash Kotwal
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Hello,

I'm thinking of changing the following code:

Code:
/*--------------------------------*- C++ -*----------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  6
     \\/     M anipulation  |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    location    "0";
    object      epsilon;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 2 -3 0 0 0 0];

internalField   uniform 1e-08;

boundaryField
{
    lowerWall
    {
        type            epsilonWallFunction;
        value           $internalField;
    }
    upperWall
    {
        type            epsilonWallFunction;
        value           $internalField;
    }
    front
    {
        type            cyclic;
    }
    back
    {
        type            cyclic;
    }
    defaultFaces
    {
        type            empty;
    }
}


// ************************************************************************* //
So, in the above code instead of 'cyclic' boundary conditions, is it possible to use flow velocity as inlet and outlet boundary conditions?

In other words, change the boundary conditions in U file in following way:

Code:
/*--------------------------------*- C++ -*----------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  6
     \\/     M anipulation  |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       volVectorField;
    location    "0";
    object      U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField   uniform (1 0 0);

boundaryField
{
    lowerWall
    {
        type            noSlip;
    }
    upperWall
    {
        type            noSlip;
    }
    front   // so change this 'cyclic' BC to inlet and outlet velocity condition
    {
        type            fixedValue;
        value          ( 1 0 0 );   
    }
    back
    {
        type            fixedValue;
        value          ( 1 0 0 );
    }
    defaultFaces
    {
        type            empty;
    }
}


// ************************************************************************* //
is it possible to do that?
Can anyone explain 'cyclic' boundary condition is governing the entire model?
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boundaryfoam, incompressible flow

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