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fcb0b3a42d
- explicitly use List<int> instead List<label> for API compatibility, even when 64-bit labels are in use.
112 lines
2.8 KiB
C++
112 lines
2.8 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) 2011 OpenFOAM Foundation
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\\/ M anipulation | Copyright (C) 2016 OpenCFD Ltd.
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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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Class
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Foam::fft
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Description
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Fast fourier transform using the fftw library.
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The complex transform field is returned in the field supplied. The
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direction of transform is supplied as an argument (-1 = forward, 1 =
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reverse). The dimensionality and organisation of the array of values
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in space is supplied in the nn indexing array.
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Note
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The fftw library uses int only (no longs) for its dimensionality.
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SourceFiles
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fft.C
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\*---------------------------------------------------------------------------*/
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#ifndef fft_H
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#define fft_H
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#include "complexFields.H"
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#include "UList.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace Foam
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{
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class fft
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{
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public:
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enum transformDirection
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{
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FORWARD_TRANSFORM = -1,
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REVERSE_TRANSFORM = 1
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};
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static void transform
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(
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complexField& field,
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const UList<int>& nn,
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transformDirection fftDirection
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);
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static tmp<complexField> forwardTransform
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(
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const tmp<complexField>& field,
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const UList<int>& nn
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);
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static tmp<complexField> reverseTransform
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(
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const tmp<complexField>& field,
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const UList<int>& nn
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);
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static tmp<complexVectorField> forwardTransform
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(
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const tmp<complexVectorField>& field,
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const UList<int>& nn
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);
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static tmp<complexVectorField> reverseTransform
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(
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const tmp<complexVectorField>& field,
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const UList<int>& nn
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);
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};
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace Foam
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#endif
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// ************************************************************************* //
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