Sammendrag
In the present study, the results of CFD simulations by the unsteady RANS method of the flow around a generic
model of azimuthing ducted pushing thruster are presented
and compared with the results of model tests. The calculations are performed with the propeller operating at
the design pitch (P0.7/D=1.1) for different advance
coefficients in straight and oblique flow conditions. The
main quantities considered in the validation study include
propeller thrust and torque, duct thrust and side force, total thrust and total side force as well as the thruster steering moment. In addition, the loads acting on a single propeller blade are also compared to the experimental data. A good
agreement between the calculations and measurements is
achieved for most quantities except the steering moment
that shows larger relative differences from the measured
values. However, the overall variation of the steering
moment with loading and heading angle appears to be
qualitatively captured by the numerical simulations.
Separately, CFD simulations are performed with the same
thruster operating in presence of initially undisturbed free surface, at different magnitudes of submergence, in order to illustrate the impact on propulsor forces and individual blade loads.
model of azimuthing ducted pushing thruster are presented
and compared with the results of model tests. The calculations are performed with the propeller operating at
the design pitch (P0.7/D=1.1) for different advance
coefficients in straight and oblique flow conditions. The
main quantities considered in the validation study include
propeller thrust and torque, duct thrust and side force, total thrust and total side force as well as the thruster steering moment. In addition, the loads acting on a single propeller blade are also compared to the experimental data. A good
agreement between the calculations and measurements is
achieved for most quantities except the steering moment
that shows larger relative differences from the measured
values. However, the overall variation of the steering
moment with loading and heading angle appears to be
qualitatively captured by the numerical simulations.
Separately, CFD simulations are performed with the same
thruster operating in presence of initially undisturbed free surface, at different magnitudes of submergence, in order to illustrate the impact on propulsor forces and individual blade loads.