D 5[mm] "Main duct diameter"
L 4*D "Main duct length"
alpha 45[deg] "Transducer tube pitch angle"
D_transducer 2[mm] "Transducer diameter"
L_transducer D/cos(alpha)+3/2*D_transducer/cos(alpha)*tan(alpha) "Transducer duct length"
L2 D/sin(alpha) "Transducer duct length in main flow"
L1 0.5*(L_transducer-L2) "Transducer duct length of side branches"
L_matching cp_match/f0/4 "Matching layer thickness"
L_piezo cp_pzt/f0/2 "Piezoelectric transducer thickness"
nLx cos(alpha) "Unit vector in transducer duct direction (x-component)"
nLy 0 "Unit vector in transducer duct direction (y-component)"
nLz sin(alpha) "Unit vector in transducer duct direction (z-component)"