Advanced and future hydrodynamic optimisation tools in sail yacht design
Author Ridder de E.J. and Gaillarde G.
Title Advanced and future hydrodynamic optimisation tools in sail yacht design
Conference/Journal MDY Madrid Design Yacht 06
Year 2006

Since the beginning of high level sailing events, like the America’s Cup and Volvo Ocean Race, designers have used a varied and increasing set of techniques on the experimental and later on the numerical field in design sailing yachts. This paper will give the latest developments for the different fields at MARIN.
In the field of CFD calculations, the program RAPID has been extended with a sailing yacht module, which solves the exact, fully non-linear potential flow problem by an iterative procedure. This paper highlights the comparison of CFD results with some experimental results, for a small range of different sailing yacht designs.
A small introduction will be given about the new underwater, three-component particle image velocimetry system (3c-PIV or stereo- PIV). With aid of such a system it is possible to measure and visualise the flow around appendages such as keel, winglets bulb and rudder.
Even if investigated in many occasions in the past, mainly through calculations, performances in dynamic conditions are not yet part of the standard design spiral.
Seakeeping and manoeuvring aspects require more variables than steady conditions and require more complex numerical and experimental tools, which probably explain partly their nearly total absence into the design process. At a time
where optimisation has reduced drastically the scatter into hull performance, seakeeping and manoeuvring aspects can be seen as new fields open for potential increase in performance and create the
difference with other designs.

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