The wake flow downstream of a propeller-rudder system

We report wall-resolved, large-eddy simulations for the case of a propeller operating upstream hydrofoil, mimicking rudder. Our primary objective is identification wake features that are unique to this coupled system, when compared open-water cases, which usually focus experiments and computations in literature. were able achieve unprecedented levels numerical resolution, capture dynamics all energetic eddies flow by using scalable, conservative, structured solver cylindrical coordinates. The boundary conditions on rotating hydrofoil enforced via an immersed formulation. largest values turbulent stresses achieved outwards from radial coordinate tip blades. This due spanwise gradients across (in direction parallel span hydrofoil), producing displacement pressure side legs vortices towards outer coordinates, where they experience shear with hydrofoil. evolution turbulence non-monotonic streamwise direction. consequence growing resulting complex interactions involving layers trailing edge, two branches hub vortex coming sides Such reinforced velocities developed Compared isolated propeller, these phenomena enhance production. present results highlight downstream typical surface ships, significantly intensify signature propeller.