Flow induced noise of a submarine with propeller

In this study, the hydro-acoustic performance of the benchmark DARPA Suboff AFF-8 appended form with E1619 model propeller has been investigated by RANS (Reynolds averaged Navier-Stokes) coupled FWH (Ffowcs Williams Hawkings) analogy. The governing (RANS) equations have been discretized with finite volume method (FVM). Verification and validation study has been done to determine the optimum grid number for resistance analyses. The numerical hydro-acoustic analyses have been conducted with optimum grid number. The propeller-hull interaction has been modelled with two different methods. First, the propeller has been modelled as an actuator disc based on body force method coupled with experimental open water data. Later, the original propeller itself has been modelled with a rotating region behind the submarine hull. After computing the self-propulsion point, the FW-H equation with RANS approach has been solved to predict the flow induced noise in the presence of the propeller. The flow induced noise of appended submarine form has been investigated for one velocity at self-propulsion point. The effects of both propeller modelling techniques (i.e. body force and original propeller) on the flow induced noise have been discussed.