fn 440[Hz] Frequency of an A note Lguess 1/2*c0/fn Half wavelength L 0.3715[m] Pipe length a 3[cm] Pipe inner radius dw 2[mm] Pipe wall thickness Ew 1e9[Pa] Pipe wall Young's modulus nuw 0.4 Pipe wall Poisson's ratio c0 343[m/s] Speed of sound ka 2*pi*fn/c0*a Wave number times tube radius h_min 343[m/s]/3000[Hz]/20 Mesh size at 3000 Hz