exact formula is inside /lib/skybright.cal if this can help you to find the name.
{ RCSid: $Id$ } { Sky brightness function for sunny and cloudy skies.
Additional arguments required for calculation of skybright:
A1 - 1 for CIE clear, 2 for CIE overcast, 3 for uniform, 4 for CIE intermediate A2 - zenith brightness A3 - ground plane brightness A4 - normalization factor based on sun direction A5,A6,A7 - sun direction }
cosgamma = Dx*A5 + Dy*A6 + Dz*A7;
gamma = Acos(cosgamma); { angle from sun to this point in sky }
zt = Acos(A7); { angle from zenith to sun }
eta = Acos(Dz); { angle from zenith to this point in sky }
wmean(a, x, b, y) : (a*x + b*y) / (a + b);
skybr = wmean((Dz+1.01)^10, select(A1, sunnysky, cloudysky, unifsky, intersky), (Dz+1.01)^-10, A3);
sunnysky = A2 * (.91 + 10*exp(-3*gamma) + .45*cosgamma*cosgamma) * if( Dz - .01, 1.0 - exp(-.32/Dz), 1.0) / A4;
cloudysky = A2 * (1 + 2*Dz)/3;
unifsky = A2;
intersky = A2 * ( (1.35*sin(5.631-3.59*eta)+3.12)*sin(4.396-2.6*zt) + 6.37 - eta ) / 2.326 * exp(gamma*-.563*((2.629-eta)*(1.562-zt)+.812)) / A4;
…
k. I believe this is the n1 item on the list and it will be fixed until the public release coming shortly. Hang in there!
Check: https://github.com/mostaphaRoudsari/Butterfly/issues/43
In the meantime, please let us know of the values you had to change manually in controlDict and fvSolution. Was that due to wrong values set from BF or was it because they weren't updated through BF?
Kind regards,
Theodore.…
e sideline on that comparison. But my interest is within the thermal investigations in big indoor spaces/semi-outdoor spaces as I am studying temperature distributions in atria. So it was regarding those kind of comparisons.
I sure hope I have time within my project to test out BF and hopefully compare to Ansys. I'd btw be using the k-w SST solver in Ansys. Which solvers are available in BF for indoor studies?
- Lasse…
A low-resolution work. Real time motion capture display made with an 11x8 (88) pixels iPad matrix using Grasshopper + Firefly + Pure Data + TouchOSC for iPad.