research & development
Figure 1: Pareto front
Figure 2: Measured wake. Left: Optimized hull. Right: initial hull
VIRTUE boosts the role of I
Ship resistance and propulsion are
fundamental factors in the fuel efficiency of maritime transport. Modern computational
techniques allow further improvements in that efficiency, by precisely predicting resistance
and scale effects, computational optimisation for minimum resistance or power and by under- standing and limiting propeller cavitation. The work of the 6th-Framework EU project VIRTUE has brought great progress on several fronts. Some highlights are discussed.
Auke van der Ploeg, Tom van Terwisga & Hoyte Raven
a.v.d.ploeg@
marin.nl 24 report
n the Resistance and Propulsion work package, large improvements were made in the accuracy of resistance and
wave-making computations and in the computation of scale effects [1]. Based on this, procedures for multi-objective optimi- sation of ship hulls were developed. The work culminated in a workshop in which five participants optimised the same tanker aftbody with respect to both resistance and wake field quality; using their own CAD system, hull form variation tool, grid gener- ator and RANS code. At MARIN the GMS- Merge tool was used. This tool varies hull forms by a special interpolation between some pre-defined hull form variants. De- ploying the tool was very effective. MARIN’s ample experience meant that it was rela- tively easy to add new basis hull forms during the process. The flow computations were done using PARNASSOS. By using an internal network of computers hundreds of RANS computations could be done in just a few hours.
Figure 1 shows the increase of the resist- ance relative to the initial hull form on the
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