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The performance of racing yachts has increased significantly over the past 10-15 years without significant changes to the prediction methods used in the early stages of the design. Tank testing or CFD-simulation are not always an option and especially in the early stages of design a requirement for reliable numerical methods exists...
The Effect of Bow Steepness and Flare on the Resistance of Sailing Yachts in Calm Water and Waves
In this paper some results are presented of two
studies carried out at the Ship hydromechanics
Department of the Delft University of
Technology: one, on the influence of an increase
of stem steepness of a sailing yacht, and another,
which was largely carried out by T.J.E.Tincelin
as part of his master thesis at Delft University of
Technology, on the effect of above waterline
bowflare are presented.
The BASILISCUS Project - Return of the Cruising Hydrofoil Sailboat
Basiliscus will be a cruising hydrofoil sailboat, much along the lines of David Keiper's Williwaw, but incorporating experience that has been gained in multihull design in the thirty years since Williwaw's construction. This paper covers the development plan for the entire project and the technical results of design studies performed to date. Topics covered include scaling laws for model hydrofoils, the baseline design, and preliminary CFD modeling of the hydrofoils.
YACHT97: A Fully Viscous Nonlinear Free-Surface Analysis Tool for IACC Yacht Design
A novel free-surface computer program, used to calculate
the viscous flow field about a full configuration
sailing yacht, is presentE:d. The numerical
techniques incorporated into the computer program
- YACHT97 - facilitate accura1e quantification of
the residuary and the frictional drag components
through the use of a "moving" :omputational grid
which conforms to the exact wetted surface area
of the hull. Use of a full field approach, whereby
the entire flow domain is discr,~tized, permits the
simulation of the boundary layer and wavemaking
interaction as well as the onsi~t of vortex structures
which appear downstream of lift producing
appendages. A recently implemented free-surface
discretization permits the bow wave evolution to
proceed to the near-breaking point. Computed results
include comparisons between the inviscid and
viscous flowfields about a bare-hull configuration
and a full configuration with keel and rudder appendages.
Resistances due to hull friction, appendage friction,
wavemaking, heel and side force, and sea waves are
considered. Comparative values of each of these resistance
components for four boats, including one with
two different sets of appendages, are shown. Most of
the resistance components are accurately determined
by a combination of theory, numerical computation or
model testing. An exception is the resistance due to
sea waves for which nonlinear effects not accounted for
in present theories appear to be significant. Some design
features which increase resistance have associated
speed-increasing effects. An example is increasing the
vessel beam which increases wetted surface, and therefore
the frictional resistance, but has an associated increase
in potential sail power. This demonstrates the
necessity of analysing the entire system with a good
velocity prediction program rather than using an analysis
based on a few resistance components.