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stochasticDispersionRAS: Distribute UTurb uniformly

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Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1568
This commit is contained in:
Henry
2015-03-13 13:13:42 +00:00
parent 24e1984fbe
commit 935359117e
1 changed files with 27 additions and 13 deletions
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40
src/lagrangian/turbulence/submodels/Kinematic/DispersionModel/StochasticDispersionRAS/StochasticDispersionRAS.C
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@ -24,6 +24,9 @@ License
\*---------------------------------------------------------------------------*/ \*---------------------------------------------------------------------------*/
#include "StochasticDispersionRAS.H" #include "StochasticDispersionRAS.H"
#include "constants.H"
using namespace Foam::constant::mathematical;
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * // // * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
@ -89,29 +92,40 @@ Foam::vector Foam::StochasticDispersionRAS<CloudType>::update
if (tTurb > tTurbLoc) if (tTurb > tTurbLoc)
{ {
tTurb = 0.0; tTurb = 0;
scalar sigma = sqrt(2.0*k/3.0); const scalar sigma = sqrt(2*k/3.0);
vector dir = 2.0*rnd.sample01<vector>() - vector::one;
dir /= mag(dir) + SMALL; // Calculate a random direction dir distributed uniformly
// in spherical coordinates
const scalar theta = rnd.sample01<scalar>()*pi;
const scalar phi = rnd.sample01<scalar>()*twoPi;
// Optimising compilers will use the sincos function
const scalar sinTheta = sin(theta);
const scalar cosTheta = cos(theta);
const scalar sinPhi = sin(phi);
const scalar cosPhi = cos(phi);
const vector dir(sinTheta*cosPhi, sinTheta*sinPhi, cosTheta);
// Numerical Recipes... Ch. 7. Random Numbers... // Numerical Recipes... Ch. 7. Random Numbers...
scalar x1 = 0.0; scalar x1 = 0;
scalar x2 = 0.0; scalar x2 = 0;
scalar rsq = 10.0; scalar rsq = 10;
while ((rsq > 1.0) || (rsq == 0.0)) while ((rsq > 1) || (rsq == 0))
{ {
x1 = 2.0*rnd.sample01<scalar>() - 1.0; x1 = 2*rnd.sample01<scalar>() - 1;
x2 = 2.0*rnd.sample01<scalar>() - 1.0; x2 = 2*rnd.sample01<scalar>() - 1;
rsq = x1*x1 + x2*x2; rsq = x1*x1 + x2*x2;
} }
scalar fac = sqrt(-2.0*log(rsq)/rsq); scalar fac = sqrt(-2*log(rsq)/rsq);
fac *= mag(x1); fac *= mag(x1);
UTurb = sigma*fac*dir; UTurb = sigma*fac*dir;
} }
} }
else else