a_s 1[mm] "Source radius"
a_ta 90[mm] "Thermoviscous acoustics domain radius"
a_tot 100[mm] "Total radius"
f0 50[kHz] "Study frequency"
omega0 2*pi*f0 "Study angular frequency"
dvisc 55[um]*sqrt(100[Hz]/f0) "Viscous boundary layer thickness at f0"
c0 1484[m/s] "Speed of sound"
rho0 1000[kg/m^3] Density
lam0 c0/f0 "Wavelength at f0"
k0 2*pi/lam0 "Wave number at f0"
U0 1[mm/s] "Velocity amplitude in z-direction"