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Modern racing yacht semi-planing hull forms provide a
number of complex challenges for designers and other
professionals involved in yacht rating.
The SYRF Wide Light Project was initiated as a means
of (1) providing data with which to assess a range of
alternative computation methodologies to analyse sailing
yacht hydrodynamic forces and moments, (2) making this
data available to the entire sailing yacht research
community and (3) demonstrating how this type of study
can be used to inform the rating process.
This paper presents a comprehensive set of tank test
results in both canoe body only and appended
configurations to be used as a benchmark for a defined
geometry of a modern semi-planing hull.
Five different CFD stakeholders carried out ‘blind’ CFD
analysis on the same test matrix using a range of different
computational codes and approaches. The results are
presented here along with feedback detailing the software,
methods and resources used to generate the results.
This project offers a comprehensive set of public
domain data which researchers may use to validate and
develop their numerical tools as well as highlighting how
successfully commercial CFD codes may be used to
confidently predict the variation of the forces on a sailing
yacht hull as speed, heel and leeway change.
Finally, discussion will be made on how this first phase
of the project may be used to inform handicap rule makers.
An unsteady FSI Investigation into the Cause of the Demasting of the Volvo 70 Groupama 4
This paper describes the use of an unsteady fluid-structure interaction (FSI) tool as an investigative tool into the cause of the dismasting of the VOR 70 Groupama 4. As more than one rig component failed during the dismasting, the cause of failure was not immediately apparent. The investigation therefore required isolating the cause of failure between two closely related rig components. The FSI coupling process and the determination of the initial rig loading based on a steady FSI computation and measured data will be described. The setup for two unsteady failure cases will be discussed and the results of those investigations will be examined.
Adhesive Bonding for Structural Marine Applications
In order to make the structural junction in a sailing boat, for example between the shell and the bulkheads, many nautical
builders use overlap joints. This technique is expensive and could be replaced by direct adhesive junction without
overlap. Structural adhesive bonding has been tested on three boats prototypes : a motor boat of 5.75 m long, and two
sailing boats one of 5.5 m long and one of 10 m long. The originality of those boats is the measurement device using
strain gages included on some of the junctions during the boats construction. Gages and sensors have also been placed
on the shell, the keel and the rigging: the stress state of the bonded junctions under sailing in different conditions can
then be qualified. Therefore, testing has been managed on specimens. A coupled loads tests (bending + compression) on
tee samples seems more pertinent to qualify tee junction for shipbuilding applications.