/*--------------------------------*- C++ -*----------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  dev
     \\/     M anipulation  |
-------------------------------------------------------------------------------
Description
    Writes a cellZone with cells whose values of k fall within the top 10% of
    the range of k.

\*---------------------------------------------------------------------------*/

libs     ("libutilityFunctionObjects.so");
type     coded;

writeControl writeTime;

// Header files for classes and functions
// Example:
// #include "fvcGrad.H"
codeInclude
#{
#};

// Header file paths for Make/options, e.g. for momentum transport models
// Example:
// -I$(LIB_SRC)/MomentumTransportModels/incompressible/lnInclude
codeOptions
#{
#};

// Linked libraries for Make/options, e.g. for momentum transport models
// Not usually required since libraries are already linked to the solver
// Example:
// -lincompressibleMomentumTransportModels
codeLibs
#{
#};

codeFields
#{
    // Read fields when executing function objects with "foamPostProcess"
    fields.append("k");
#};

codeWrite
#{
    // Lookup field from the objectRegistry, e.g. k
    const volScalarField& k = mesh().lookupObject<volScalarField>("k");

    // Calculate the minimum and maximum k values
    const scalar mink = min(k).value();
    const scalar maxk = max(k).value();

    // Fraction of the range of k
    const scalar f = 0.1;

    mesh().cellZones().append
    (
        "gradKZone",
        selectIndices
        (
            k,
            [&](const scalar k)
            {
                return k > f*mink + (1.0 - f)*maxk;
            }
        )
    );

    // Update current time for the cell zones
    mesh().cellZones().updateTimeInstance();

    // Write the zones
    mesh().cellZones().write();
#};

// ************************************************************************* //