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StochasticDispersionRAS: Corrected spherical distribution of UTurb direction

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Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1650
This commit is contained in:
Henry
2015-04-08 12:22:33 +01:00
parent 5688e3daa7
commit 9a3e5828f0
1 changed files with 4 additions and 10 deletions
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14
src/lagrangian/turbulence/submodels/Kinematic/DispersionModel/StochasticDispersionRAS/StochasticDispersionRAS.C
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@ -99,17 +99,11 @@ Foam::vector Foam::StochasticDispersionRAS<CloudType>::update
// Calculate a random direction dir distributed uniformly
// in spherical coordinates
const scalar theta = rnd.sample01<scalar>()*pi;
const scalar phi = rnd.sample01<scalar>()*twoPi;
const scalar theta = rnd.sample01<scalar>()*twoPi;
const scalar u = 2*rnd.sample01<scalar>() - 1;
// 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);
const scalar a = sqrt(1 - sqr(u));
const vector dir(a*cos(theta), a*sin(theta), u);
// Numerical Recipes... Ch. 7. Random Numbers...
scalar x1 = 0;