| dc.description.abstract | In the design phase of the dimensioning process of a ship, it is difficult to be
precise about the thrust results in the propeller studies. The exact thrust that the
propeller will produce and the thrust that will be lost toe to the viscous forces is,
nowadays, known only when the vessel is already built and the test of thrust of
the boats, called bollard pull test, is performed.
Thanks to the informatics development, the computational fluid dynamics is
bringing betler results every day. The importance of numerical simulations in
various fields of application is by now widely accepted. There are in particular
relevant cases where experiments are too costly, too dangerous or even
impossible when the process to be simulated is not even observable in
experiments. Therefore computational fluid dynamics (CFD) simulations it is an
economic and reliable way to determinate the boat capacities before its
co nstructio n.
This study is focused in simulating the bollard pull test of a concrete tug, check
the results and from there analyse the zone requirements from the
Classification Societies. These Societies made studies to determinate the
requirements of the zone for the bollard pull test performance of boats with
regular propellers (screw propeller), but it is not the only kind of existent
propellers. In this study many simulations of a tug with a Voith Schneider
Propeller will be run and analysed. The effect that makes the characteristics of
the zone where the test have to be performed will be studied. Also the
requirements of the Classifications Societies will be simulated for this tug with
the VSP.
After analysing and comparing all the simulations results, possible requirements
for the bollard pull test zone for boats with a VSP will be suggested. | en_US |