The main objective of this paper has been to demonstrate
the use of hydrodynamic design tools for the assessment
of propulsion concepts.
Long-term measurements on board of a RoRo-ship show
the necessity to take the versatile operational profile into
account during the layout of the propulsion concept.
In order to be able to design the propeller for the given
design- and off-design conditions, it is necessary to be
able to design the blade in an easy way and at the same
time to extract the blade geometry for pitch settings
different from the design pitch.
The propeller can then be assessed with hydrodynamic
calculations. Both VLM and RANS calculation results are
presented here, giving an overview over the applicability
of both methods. The use of both RANS and VLM then
allows the computation of the CPP performance in offdesign
conditions with a sufficient accuracy for the ship’s
design stage.
The definition of the combinator mode then allows the
assessment of the total performance of the prime movers
and auxiliary engines in different operating conditions in
terms of fuel consumption. The propeller and propulsion
evaluation presented in this paper is therefore an integral
part of the ship design.
The presented calculation results of the flow around the
rudder show that RANS calculations can also contribute
to the evaluation of the rudder design in off-design
conditions.