Add the OpenFOAM source tree

applications/utilities/preProcessing/engineSwirl/Make/files

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+engineSwirl.C
+
+EXE = $(FOAM_APPBIN)/engineSwirl

applications/utilities/preProcessing/engineSwirl/Make/options

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+EXE_INC = \
+    -I$(LIB_SRC)/finiteVolume/lnInclude
+
+EXE_LIBS = \
+    -lfiniteVolume \
+    -lgenericPatchFields
+

applications/utilities/preProcessing/engineSwirl/createFields.H

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+Info<< "Reading combustion properties\n" << endl;
+
+IOdictionary engineGeometry
+(
+    IOobject
+    (
+        "engineGeometry",
+        runTime.constant(),
+        mesh,
+        IOobject::MUST_READ_IF_MODIFIED,
+        IOobject::NO_WRITE
+    )
+);
+
+vector swirlAxis
+(
+    engineGeometry.lookup("swirlAxis")
+);
+
+vector swirlCenter
+(
+    engineGeometry.lookup("swirlCenter")
+);
+
+dimensionedScalar swirlRPMRatio
+(
+    engineGeometry.lookup("swirlRPMRatio")
+);
+
+dimensionedScalar swirlProfile
+(
+    engineGeometry.lookup("swirlProfile")
+);
+
+dimensionedScalar bore
+(
+    engineGeometry.lookup("bore")
+);
+
+dimensionedScalar rpm
+(
+    engineGeometry.lookup("rpm")
+);
+
+
+Info<< "Reading field U\n" << endl;
+volVectorField U
+(
+    IOobject
+    (
+        "U",
+        runTime.timeName(),
+        mesh,
+        IOobject::MUST_READ,
+        IOobject::AUTO_WRITE
+    ),
+    mesh
+);
+
+vector zT = swirlAxis;
+vector yT = vector(0, zT.z(), -zT.y());
+vector xT = vector
+(
+    zT.y()*zT.y() + zT.z()*zT.z(),
+    -zT.x()*zT.y(),
+    -zT.x()*zT.z()
+);
+
+// if swirl is around (1, 0, 0) we have to find another transformation
+if (mag(yT) < SMALL)
+{
+    yT = vector(zT.y(), -zT.x(), 0);
+    xT = vector(-zT.x()*zT.z(), -zT.y()*zT.z(), zT.x()*zT.x() + zT.y()*zT.y());
+}
+
+//swirlAxis doesn't have to be of unit length.
+xT /= mag(xT);
+yT /= mag(yT);
+zT /= mag(zT);

applications/utilities/preProcessing/engineSwirl/engineSwirl.C

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+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2011-2013 OpenFOAM Foundation
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+Application
+    engineSwirl
+
+Description
+    Generates a swirling flow for engine calulations.
+
+\*---------------------------------------------------------------------------*/
+
+#include "fvCFD.H"
+#include "mathematicalConstants.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+int main(int argc, char *argv[])
+{
+
+#   include "setRootCase.H"
+#   include "createTime.H"
+#   include "createMesh.H"
+#   include "createFields.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+    scalar Vphi = (constant::mathematical::pi*swirlRPMRatio*rpm/30).value();
+    scalar b1 = j1(swirlProfile).value();
+    scalar b2 = 2.0*b1/swirlProfile.value() - j0(swirlProfile).value();
+
+    scalar omega = 0.125*(Vphi*bore*swirlProfile/b2).value();
+
+    scalar cylinderRadius = 0.5*bore.value();
+
+    scalar Umax = 0.0;
+    forAll(mesh.C(), celli)
+    {
+        vector c = mesh.C()[celli] - swirlCenter;
+        scalar r = ::pow(sqr(c & xT) + sqr(c & yT), 0.5);
+
+        if (r <= cylinderRadius)
+        {
+            scalar b = j1(swirlProfile*r/cylinderRadius).value();
+            scalar vEff = omega*b;
+            r = max(r, SMALL);
+            U[celli] = ((vEff/r)*(c & yT))*xT + (-(vEff/r)*(c & xT))*yT;
+            Umax = max(Umax, mag(U[celli]));
+        }
+    }
+
+    Info<< "Umax = " << Umax << endl;
+
+    U.write();
+
+    Info<< "\n end\n";
+
+    return 0;
+}
+
+
+// ************************************************************************* //