2D submerged structure
An infinitely long cylindrical shell with a single deck,
a simple idealised submarine, scatters an incident wave
from an oblique direction. The deck is a thin plate and is
excited in high order modes. The cylindrical shell also responds
in a wavelength much shorter than the acoustic wavelength.
Under these conditions the fluid loading has a predominately
added mass effect on the structure. The pressure field is
evanescent on the surface of the cylinder. The incident
travelling wave is diffracted significantly at low frequencies,
but as the frequency is increased a shadow zone emerges.
The animations below show the vibration of the structure and pressure
field at various frequencies.
100 Hz
200 Hz
300 Hz
400 Hz
500 Hz