Numerical Study on the Unsteady Flow Field Characteristics of a Podded Propulsor Based on DDES Method

The podded propulsor has gradually become an important propulsion device for high technology ships in recent years because of its characteristics maneuverability, efficiency, low noise, and vibration. performance is closely related to flow field. To study the unsteady field propulsor, DDES (delayed detached eddy simulation) method was used carry out high-precision transient numerical simulations. Results showed that pod a significant influence on rotor–stator interaction between propeller can be observed, leading periodic fluctuation thrust propeller. On surface pod, pressure distribution changes with time, difference local lateral force. In spatial region affected by wake flow, presents spiral characteristic, both far away from strut fin. vortex structures are complex since interference pod. addition tip, root hub vortex, fin vortices also occur. generated effect mutual inductance discussed.