f0 120[Hz] "Signal frequency"
c0 1500[m/s] "Speed of sound"
lam0 c0/f0 "Wavelength at f0"
T0 1/f0 "Period at f0"
Tend 2.5*lbent/c0 "Simulation end time"
Lprop c0*Tend "Propagation length at Tend"
lbent L1+L3 "Total distance to the bend"