createFields.H

Info<< "Reading field p\n" << endl;
volScalarField p
(
    IOobject
    (
        "p",
        runTime.timeName(),
        mesh,
        IOobject::MUST_READ,
        IOobject::AUTO_WRITE
    ),
    mesh
);

Info<< "Reading field U\n" << endl;
volVectorField U
(
    IOobject
    (
        "U",
        runTime.timeName(),
        mesh,
        IOobject::MUST_READ,
        IOobject::AUTO_WRITE
    ),
    mesh
);

#include "createPhi.H"


label pRefCell = 0;
scalar pRefValue = 0.0;
setRefCell(p, simple.dict(), pRefCell, pRefValue);
mesh.setFluxRequired(p.name());


Info<< "Reading field pa\n" << endl;
volScalarField pa
(
    IOobject
    (
        "pa",
        runTime.timeName(),
        mesh,
        IOobject::MUST_READ,
        IOobject::AUTO_WRITE
    ),
    mesh
);

Info<< "Reading field Ua\n" << endl;
volVectorField Ua
(
    IOobject
    (
        "Ua",
        runTime.timeName(),
        mesh,
        IOobject::MUST_READ,
        IOobject::AUTO_WRITE
    ),
    mesh
);

#include "createPhia.H"


label paRefCell = 0;
scalar paRefValue = 0.0;
setRefCell
(
    pa,
    simple.dict(),
    paRefCell,
    paRefValue
);
mesh.setFluxRequired(pa.name());


singlePhaseTransportModel laminarTransport(U, phi);

autoPtr<incompressible::turbulenceModel> turbulence
(
    incompressible::turbulenceModel::New(U, phi, laminarTransport)
);


dimensionedScalar zeroSensitivity(dimVelocity*dimVelocity, Zero);
dimensionedScalar zeroAlpha(dimless/dimTime, Zero);

dimensionedScalar lambda
(
    "lambda",
    dimTime/sqr(dimLength),
    laminarTransport
);

dimensionedScalar alphaMax
(
    "alphaMax",
    dimless/dimTime,
    laminarTransport
);

const labelList& inletCells = mesh.boundary()["inlet"].faceCells();
//const labelList& outletCells = mesh.boundary()["outlet"].faceCells();

volScalarField alpha
(
    IOobject
    (
        "alpha",
        runTime.timeName(),
        mesh,
        IOobject::READ_IF_PRESENT,
        IOobject::AUTO_WRITE
    ),
    lambda*max(Ua & U, zeroSensitivity)
);
zeroCells(alpha, inletCells);
//zeroCells(alpha, outletCells);

#include "createFvOptions.H"