L 20[m] Pipe length R 398.5[mm] Pipe inner radius w 8[mm] Pipe wall thickness E 210[GPa] Pipe Youngs modulus Q0 0.5[m^3/s] Initial flow rate u0 Q0/(R^2*pi) Initial velocity p0 1[atm] Initial pressure z0 11.15[m] Measurement point dt 0.2*L/N/1020[m/s] Time step according to CFL N 400 Number of mesh points