123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 2016 OpenCFD Ltd.
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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\*---------------------------------------------------------------------------*/
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#include "Hanning.H"
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#include "addToRunTimeSelectionTable.H"
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#include "mathematicalConstants.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace Foam
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{
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namespace windowModels
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{
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// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
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defineTypeNameAndDebug(Hanning, 0);
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addToRunTimeSelectionTable(windowModel, Hanning, dictionary);
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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Hanning::Hanning(const dictionary& dict, const label nSamples)
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:
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windowModel(dict, nSamples),
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symmetric_(readBool(dict.lookup("symmetric"))),
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extended_(readBool(dict.lookup("extended"))),
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alpha_(dict.lookupOrDefault("alpha", 0.5)) // Hamming = 0.54
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{
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// Extend range if required
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label offset = extended_ ? 1 : 0;
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scalar m = nSamples - 1 + 2*offset;
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scalarField t(nSamples);
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forAll(t, i)
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{
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t[i] = i + offset;
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}
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scalarField& wf = *this;
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wf = alpha_ - (1 - alpha_)*cos(constant::mathematical::twoPi*t/m);
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// Reset second half of window if symmetric
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if (symmetric_)
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{
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label midPointI = 0;
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if (nSamples % 2 == 0)
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{
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midPointI = nSamples/2;
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}
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else
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{
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midPointI = (nSamples + 1)/2;
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}
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for (label i = 0; i < midPointI; i++)
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{
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wf[nSamples - i - 1] = wf[i];
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}
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}
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scalar sumSqr = sum(sqr(wf));
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// Normalisation
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wf *= sqrt(nSamples/sumSqr);
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}
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// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
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Hanning::~Hanning()
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{}
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// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
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bool Hanning::symmetric() const
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{
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return symmetric_;
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}
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bool Hanning::extended() const
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{
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return extended_;
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}
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Foam::scalar Hanning::alpha() const
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{
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return alpha_;
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}
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace windowModels
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} // End namespace Foam
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// ************************************************************************* //
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