ENH: Updates to rotorDiskSource momentum source

- code restructuring
- better spefication of rotor axis direction (uses pointAbove)
- run-time selectable trim models
- new rotor trimming model: targetForce

src/fieldSources/basicSource/rotorDiskSource/trimModel/fixed/fixedTrim.C

@@ -0,0 +1,96 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2012 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/>.
+
+\*---------------------------------------------------------------------------*/
+
+#include "fixedTrim.H"
+#include "addToRunTimeSelectionTable.H"
+#include "unitConversion.H"
+#include "mathematicalConstants.H"
+
+using namespace Foam::constant;
+
+// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
+
+namespace Foam
+{
+    defineTypeNameAndDebug(fixedTrim, 0);
+
+    addToRunTimeSelectionTable(trimModel, fixedTrim, dictionary);
+}
+
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+Foam::fixedTrim::fixedTrim(const rotorDiskSource& rotor, const dictionary& dict)
+:
+    trimModel(rotor, dict, typeName),
+    thetag_(rotor.cells().size(), 0.0)
+{
+    read(dict);
+}
+
+
+// * * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * //
+
+Foam::fixedTrim::~fixedTrim()
+{}
+
+
+// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
+
+void Foam::fixedTrim::read(const dictionary& dict)
+{
+    trimModel::read(dict);
+
+    scalar theta0 = degToRad(readScalar(coeffs_.lookup("theta0")));
+    scalar theta1c = degToRad(readScalar(coeffs_.lookup("theta1c")));
+    scalar theta1s = degToRad(readScalar(coeffs_.lookup("theta1s")));
+
+    const List<vector>& x = rotor_.x();
+    forAll(thetag_, i)
+    {
+        scalar psi = x[i].y();
+        if (psi < 0)
+        {
+            psi += mathematical::twoPi;
+        }
+
+        thetag_[i] = theta0 + theta1c*cos(psi) + theta1s*sin(psi);
+    }
+}
+
+
+Foam::tmp<Foam::scalarField> Foam::fixedTrim::thetag() const
+{
+    return tmp<scalarField>(thetag_);
+}
+
+
+void Foam::fixedTrim::correct(const vectorField& U, vectorField& force)
+{
+    // do nothing
+}
+
+
+// ************************************************************************* //