6DOF behavior of an offshore racing trimaran in an unsteady environment
Communication avec acte
While in recent years the use of hydrofoils has experienced a substantial growth, traditional design tools such as Velocity Prediction Programs (VPP) have proven inadequate to help architects and engineers with performance trade offs which now include specific stability issues related to these foils. The quest for performance also demands a better account of the unsteadiness of the environment in which the offshore yachts evolve. Time-domain analysis and system-based modeling allow for an improved understanding of the controllability and dynamic stability of given geometries, enabling to adapt and refine the design. This paper presents such a dynamical unsteady model, based on the superposition of several loads components, computed from either numerical, empirical or analytical models. A test case and its results are presented to show the reliability and efficiency of the developed numerical tool, by comparing response amplitude operators of a reference hull form with experimental and numerical data. Finally, the paper outlines two 6DOF dynamic simulations of an offshore trimaran. The first case shows a simple bearaway maneuver and compares two sail tuning strategies, while the second one presents the yacht evolution in unsteady wind demonstrating how in varying conditions the boat may reach attitudes that widely differ from the steady ones.
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High Froude Number Experimental Investigation of the 2 DOF Behavior of a Multihull Float in Head Waves Article dans une revue avec comité de lectureKERDRAON, Paul; HOREL, Boris; BOT, Patrick; LETOURNEUR, Adrien; DAVID LE TOUZÉ, David (The Society of Naval Architects and Marine Engineers, 2021)Dynamic Velocity Prediction Programs are taking an increasingly prominent role in high performance yacht design, as they allow to deal with seakeeping abilities and stability issues. Their validation is however often ...
Article dans une revue avec comité de lectureKERDRAON, Paul; HOREL, Boris; BOT, Patrick; LETOURNEUR, Adrien; LE TOUZÉ, David (Elsevier, 2020)Thanks to high lift-to-drag ratios, hydrofoils are of great interest for high-speed vessels. Modern sailing yachts fitted with foils have thus reached impressively high speeds on the water. But this hydrodynamic efficiency ...
High Froude Number Experimental Investigation of the 2DOF Behavior of a Multihull Float in Head Waves Communication avec acteKERDRAON, Paul; HOREL, Boris; BOT, Patrick; LETOURNEUR, Adrien; LE TOUZÉ, David (INNOVSAIL, 2020-06)Dynamic Velocity Prediction Programs are taking an increasingly prominent role in high performance yacht design, as they allow to deal with seakeeping abilities and stability issues. Their validation is however often ...
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Communication avec acteDEPARDAY, Julien; BOT, Patrick; HAUVILLE, Frédéric; AUGIER, Benoit; RABAUD, Marc; MOTTA, Dario; LE PELLEY, David (2016)While sailing offwind, the trimmer typically adjusts the downwind sail "on the verge of luffing", letting occasionally the luff of the sail flapping. Due to the unsteadiness of the spinnaker itself, maintaining the luff ...