gamma 1.4 "Ratio of specific heats"
M -0.5 "Mean flow Mach number"
m 10 "Azimuthal mode number"
omega 16 "Angular frequency"
f omega/(2*pi) Frequency
rho0 1 "Reference density"
C0 1 "Reference mean speed of sound"
Zw 2-i "Duct wall impedance"
zi 1.86393 "Axial coordinate, inlet plane"
ri 0.91705 "Radial coordinate, inlet plane"