[LuckyTran]

OF 2.4.x

It is quite easy to fix the values of a field to a set scalar/vector by using fvOptions. E.g., I can set the value of b to be uniform everywhere all the time to the value 1 by using:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.4                                   |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "system";
    object      fvOptions;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

banana
    {
    type            scalarExplicitSetValue;
    active          true;
    selectionMode   all;
    scalarExplicitSetValueCoeffs
    {
        injectionRate
        {
            b      1;
        }
    }
    }
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

I have run a case where I have calculated the temporal average of b using fieldAverage and now I want to fix b all the time to bMean. How would this be done? I.e. an implementation that looks something like this...

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.4                                   |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "system";
    object      fvOptions;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

coldCase
    {
    type            scalarExplicitSetValue;
    active          true;
    selectionMode   all; // points; cellSet; cellZone; all;
    scalarExplicitSetValueCoeffs
    {
        injectionRate
        {
            b      $bMean;
        }
    }
    }
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

Yes this obviously is equivalent to skipping the solution of an equation (but that requires rebuilding the solver which might break other things because b is coupled to other stuff).