Turbofan engine inlet duct modes (
M
= 0.5
)
kb
= 3,
m
= 1, soft wall
kb
= 16,
m
= 10, hard wall
kb
= 20,
m
= 10, soft wall
kb
= 30,
m
= 10, hard wall
(see Journal of Fluid Mechanics
380
, 1999, p.279-296;
437
, 2001, p.366-383;
495
, 2003, p.157-173)