1 /*---------------------------------------------------------------------------*\
3 \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
5 \\ / A nd | Copyright (C) 1991-2009 OpenCFD Ltd.
7 -------------------------------------------------------------------------------
9 This file is part of OpenFOAM.
11 OpenFOAM is free software; you can redistribute it and/or modify it
12 under the terms of the GNU General Public License as published by the
13 Free Software Foundation; either version 2 of the License, or (at your
14 option) any later version.
16 OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
17 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21 You should have received a copy of the GNU General Public License
22 along with OpenFOAM; if not, write to the Free Software Foundation,
23 Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
29 Fast fourier transform derived from the Numerical
32 The complex transform field is returned in the field supplied. The
33 direction of transform is supplied as an argument (1 = forward, -1 =
34 reverse). The dimensionality and organisation of the array of values
35 in space is supplied in the nn indexing array.
40 \*---------------------------------------------------------------------------*/
45 #include "complexFields.H"
46 #include "labelList.H"
48 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
58 enum transformDirection
60 FORWARD_TRANSFORM = 1,
61 REVERSE_TRANSFORM = -1
69 transformDirection fftDirection
73 static tmp<complexField> forwardTransform
75 const tmp<complexField>& field,
80 static tmp<complexField> reverseTransform
82 const tmp<complexField>& field,
87 static tmp<complexVectorField> forwardTransform
89 const tmp<complexVectorField>& field,
94 static tmp<complexVectorField> reverseTransform
96 const tmp<complexVectorField>& field,
102 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
104 } // End namespace Foam
106 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
110 // ************************************************************************* //