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BUG: fftw: missing normalisation. See #867.

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This commit is contained in:
mattijs
2018-06-13 14:09:37 +01:00
parent 51c48fa9c9
commit 765c2051aa
3 changed files with 17 additions and 3 deletions
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2
applications/solvers/DNS/dnsFoam/dnsFoam.C
View File

@ -66,7 +66,7 @@ int main(int argc, char *argv[])
fft::reverseTransform fft::reverseTransform
( (
K/(mag(K) + 1.0e-6) ^ forceGen.newField(), K.nn() K/(mag(K) + 1.0e-6) ^ forceGen.newField(), K.nn()
) )*recRootN
); );
#include "globalProperties.H" #include "globalProperties.H"

7
applications/solvers/DNS/dnsFoam/readTurbulenceProperties.H
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@ -19,3 +19,10 @@
Kmesh K(mesh); Kmesh K(mesh);
UOprocess forceGen(K, runTime.deltaTValue(), turbulenceProperties); UOprocess forceGen(K, runTime.deltaTValue(), turbulenceProperties);
label ntot = 1;
forAll(K.nn(), idim)
{
ntot *= K.nn()[idim];
}
const scalar recRootN = 1.0/Foam::sqrt(scalar(ntot));

11
src/randomProcesses/turbulence/turbGen.C
View File

@ -3,7 +3,7 @@
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | \\ / O peration |
\\ / A nd | Copyright (C) 2011 OpenFOAM Foundation \\ / A nd | Copyright (C) 2011 OpenFOAM Foundation
\\/ M anipulation | \\/ M anipulation | Copyright (C) 2018 OpenCFD Ltd.
------------------------------------------------------------------------------- -------------------------------------------------------------------------------
License License
This file is part of OpenFOAM. This file is part of OpenFOAM.
@ -60,6 +60,13 @@ Foam::vectorField Foam::turbGen::U()
s = Ek(Ea, k0, mag(K))*s; s = Ek(Ea, k0, mag(K))*s;
label ntot = 1;
forAll(K.nn(), idim)
{
ntot *= K.nn()[idim];
}
const scalar recRootN = 1.0/sqrt(scalar(ntot));
complexVectorField up complexVectorField up
( (
fft::reverseTransform fft::reverseTransform
@ -67,7 +74,7 @@ Foam::vectorField Foam::turbGen::U()
ComplexField(cos(constant::mathematical::twoPi*rndPhases)*s, ComplexField(cos(constant::mathematical::twoPi*rndPhases)*s,
sin(constant::mathematical::twoPi*rndPhases)*s), sin(constant::mathematical::twoPi*rndPhases)*s),
K.nn() K.nn()
) )*recRootN
); );
return ReImSum(up); return ReImSum(up);