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primitives/transform: Added functios to generate rotation tensor about the given axis

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Henry Weller 2016-03-17 18:09:04 +00:00
parent 69dd56b9dd
commit e2d1156ddd
1 changed files with 23 additions and 0 deletions
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23
src/OpenFOAM/primitives/transform/transform.H
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@ -119,6 +119,29 @@ inline tensor Rz(const scalar& omega)
}
//- Rotational transformation tensor about axis a by omega radians
inline tensor Ra(const vector& a, const scalar omega)
{
const scalar s = sin(omega);
const scalar c = cos(omega);
return tensor
(
sqr(a.x())*(1 - c) + c,
a.y()*a.x()*(1 - c) + a.z()*s,
a.x()*a.z()*(1 - c) - a.y()*s,
a.x()*a.y()*(1 - c) - a.z()*s,
sqr(a.y())*(1 - c) + c,
a.y()*a.z()*(1 - c) + a.x()*s,
a.x()*a.z()*(1 - c) + a.y()*s,
a.y()*a.z()*(1 - c) - a.x()*s,
sqr(a.z())*(1 - c) + c
);
}
inline label transform(const tensor&, const bool i)
{
return i;