This Function converts the azimuth based on AixLib to the north based definition.
function to_northAzimuth
extends Modelica.Units.Icons.Conversion;
input Modelica.Units.SI.Angle azi "Surface azimuth. azi=-90 degree if surface outward unit normal points
toward east; azi=0 if it points toward south";
output Modelica.Units.SI.Angle alpha "North based azimuth. alpha=0 if surface outward unit normal points toward
north; alpha=90 degree if it points toward east.";
end to_northAzimuth;