/*--------------------------------*- C++ -*----------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  12
     \\/     M anipulation  |
-------------------------------------------------------------------------------
Description
    Caches and writes a volVectorField of grad(p)

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

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

executeControl  writeTime;
writeControl    writeTime;

codeInclude
#{
    // Header files for classes and functions, e.g. for fvc::grad
    #include "fvcGrad.H"
#};

// 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("p");
#};

codeExecute
#{
    // Lookup existing field from objectRegistry, e.g. pressure p
    const volScalarField& p = mesh().lookupObject<volScalarField>("p");

    // Calculate and store field, e.g. grad(p)
    store("gradP", fvc::grad(p));
#};

codeWrite
#{
    return writeObject("gradP");
#};

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