Abstract:Horizontal T-foils allow for maximum lift generation within a given span. However, the lift force on a T-foil acts on the symmetry plane of the hull, thereby producing no righting moment. It results in a lack of transverse stability during foil-borne sailing. In this paper, we propose a system, where the height-regulating flap on the trailing edge of the foil is split into a port and a starboard part, whose deflection angles are adjusted to shift the centre of effort of the lift force. Similar to the ailerons … Show more
“…In addition, interesting designs have emerged from the studies conducted for the America's Cup racing sailboats, where safety factors are kept to minimum to attain maximum performance (Parolini and Quarteroni 2005). Many racing and fast-cruising foiling sailboats use state-of-the-art actively controlled foils and appendages; see, e.g., the methodology proposed by (Amoroso, et al 2021) for the seakeeping of a flying yacht or the split-flap concept for the T-foil of a sailing yacht (Prabahar, Persson and Larsson 2022).…”
Bio-inspired thrusters based on flapping-foils have been proposed as an alternative to conventional rotary propellers for autonomous underwater vehicles (AUVs). By mimicking the swimming mode found among a group of vertebrates, such as sharks and marine mammals, flappingfoils have the potential to achieve very high propulsive efficiency, thus allowing for an extension of the overall operational capabilities of AUVs that come with energy range limitations. At the same time, their low frequency operation provides stealth in terms of acoustic noise which is essential for oceanic exploration and observation of marine life. This work is dedicated to the hydrodynamic optimization of a concept flapping-foil thruster under nonlinear constraints regarding the thrust coefficient and effective angle of attack. We investigate the effects of a wide range of geometric and kinematic parameters including prescribed active deformation, in the sense bending and twisting to the overall performance of the wing. Each candidate design is evaluated using a cost-effective GPU-accelerated boundary element solver (BEM) that is developed to facilitate the optimization process.
“…In addition, interesting designs have emerged from the studies conducted for the America's Cup racing sailboats, where safety factors are kept to minimum to attain maximum performance (Parolini and Quarteroni 2005). Many racing and fast-cruising foiling sailboats use state-of-the-art actively controlled foils and appendages; see, e.g., the methodology proposed by (Amoroso, et al 2021) for the seakeeping of a flying yacht or the split-flap concept for the T-foil of a sailing yacht (Prabahar, Persson and Larsson 2022).…”
Bio-inspired thrusters based on flapping-foils have been proposed as an alternative to conventional rotary propellers for autonomous underwater vehicles (AUVs). By mimicking the swimming mode found among a group of vertebrates, such as sharks and marine mammals, flappingfoils have the potential to achieve very high propulsive efficiency, thus allowing for an extension of the overall operational capabilities of AUVs that come with energy range limitations. At the same time, their low frequency operation provides stealth in terms of acoustic noise which is essential for oceanic exploration and observation of marine life. This work is dedicated to the hydrodynamic optimization of a concept flapping-foil thruster under nonlinear constraints regarding the thrust coefficient and effective angle of attack. We investigate the effects of a wide range of geometric and kinematic parameters including prescribed active deformation, in the sense bending and twisting to the overall performance of the wing. Each candidate design is evaluated using a cost-effective GPU-accelerated boundary element solver (BEM) that is developed to facilitate the optimization process.
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