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Fix for issue 1423 (YASim miscomputes force vector on Surfaces with nonzero incidence)

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Surface::calcForce() now does reverse incidence rotation of force vector properly.
This commit is contained in:
Colin Douglas Howell 2014-03-25 01:50:21 -07:00
parent e7dec994b8
commit aa27b38666
1 changed files with 4 additions and 2 deletions
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6
src/FDM/YASim/Surface.cpp
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@ -225,8 +225,10 @@ void Surface::calcForce(float* v, float rho, float* out, float* torque)
Math::add3(lwind, out, out);
// Reverse the incidence rotation to get back to surface
// coordinates.
out[2] -= incidence * out[0];
// coordinates. Since out[] is now the force vector and is
// roughly parallel with Z, the small-angle approximation
// must change its X component.
out[0] -= incidence * out[2];
// Convert back to external coordinates
Math::tmul33(_orient, out, out);