Assessing Human-Fluid-Structure Interaction for the International Moth

Banks, J.; Giovannetti, Laura Marimon; Taylor, Joshua C.; Turnock, S.R.

doi:10.1016/j.proeng.2016.06.297

Cited by 3 publications

(4 citation statements)

References 11 publications

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“…Measuring the deformation and twist of a foil under known static load allows the assessment of its bending and torsional stiffness (Banks et al, 2016). Once the structural properties of the foil are known, it is possible to understand the effects of bending and twisting of the foil on the overall sailing performances.…”

Section: Background On Fsi Experimental Measuresmentioning

confidence: 99%

“…For the International Moth, shown in Figure 1, the change in lift coefficient with angle of attack for a Vendor T-foil was presented by Beaver and Zseleczky (2009). Having investigated the tip deflection and twist in characteristic sailing loads during a laboratory test, as described by Banks et al (2016), it was possible to assess that the tip deflection reduces the component of lift in the vertical direction as each end of the T-foil curves upward. Furthermore, the twist deformation associated with a downstream shift in centre of pressure (i.e.…”

Section: Background On Fsi Experimental Measuresmentioning

confidence: 99%

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Toward the development of a hydrofoil tailored to passively reduce its lift response to fluid load

et al. 2018

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The objective of this research is to explore the possibility of using Passive Adaptive Composite (PAC) on structures to help control the lift generated by hydrofoils on boats such as the International Moth. Intorducing composite fibres oriented at off-principal axis angles, allow a foil to passively control its pitch angle to reduce the lift generated at higher boat speeds helping to achieve a stable flight in a wide range of weather conditions. PAC utilises the inherent flexibility of a composite structure to induce a twist response under bending load which could be used to minimise the use of active control systems, or even improve the dynamic response of foils in waves. However, to design flexible foils requires numerical and experimental tools to assess the complex fluid structure interactions involved. This paper eveluates a simplified hydrofoil geometry designed to reduce its lift coefficient with increased flow speed. A coupled Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) methodology is presented to predict flexible foil performance. Validation of these numerical tools is achieved through the use of wind tunnel experiments including full field deformation measurements. Twist deformations resulted in a reduction in the effective angle of attack by approximately 30% at higher flow speeds reducing the foil lift and drag significantly.

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Section: Background On Fsi Experimental Measuresmentioning

confidence: 99%

Section: Background On Fsi Experimental Measuresmentioning

confidence: 99%

Toward the development of a hydrofoil tailored to passively reduce its lift response to fluid load

et al. 2018

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“…The moth class boat to be realized is a one-sailor foiling vessel. The research interest over this type of vessel has been concerning the design of passive and active elements to optimize the fluidodynamic behavior against water and air, while the use of textured surfaces and topologically optimized components for weight reduction appear to be neglected [19][20][21]. In this context, the project also provides several exploitable points using the AM technologies.…”

Section: Introductionmentioning

confidence: 99%

Laser Powder Bed Fusion of a Topology Optimized and Surface Textured Rudder Bulb with Lightweight and Drag-Reducing Design

Scarpellini

Finazzi

Schito

et al. 2021

JMSE

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This work demonstrates the advantages of using laser powder bed fusion for producing a rudder bulb of a moth class sailing racing boat via laser powder bed fusion (LPBF). The component was designed to reduce weight using an AlSi7Mg0.6 alloy and incorporated a biomimetic surface texture for drag reduction. For the topological optimization, the component was loaded structurally due to foil wing’s lift action as well as from the environment due to hydrodynamic resistance. The aim was to minimize core mass while preserving stiffness and the second to benefit from drag reduction capability in terms of passive surface behavior. The external surface texture is inspired by scales of the European sea bass. Both these features were embedded to the component and produced by LPBF in a single run, with the required resolution. Drag reduction was estimated in the order of for free stream velocity of . The production of the final part resulted in limited geometrical error with respect to scales 3D model, with the desired mechanical properties. A reduction in weight of approximately with respect to original full solid model from 452 to 190 g was achieved thanks to core topology optimization. Sandblasting was adopted as finishing technique since it was able to improve surface quality while preserving fish scale geometries. The feasibility of producing the biomimetic surfaces and the weight reduction were validated with the produced full-sized component.

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“…In [12] the effect of heel and trim angles has been systematically examined with CFD simulations and with experiments in towing tank to obtain a database to be implemented in a VPP model. An advanced VPP model is presented in [13] where the VPP model developed by the authors and applied to a Moth also considers the foil deflection and the crew position. These parameters are experimentally measured respectively with Digital Image Correlation techniques and with digital optical techniques of shape recognition.…”

Section: Introductionmentioning

confidence: 99%

Using FEM simulation to predict structural performances of a sailing dinghy

Mancuso

Pitarresi

Tumino

2017

Int J Interact Des Manuf

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The use of finite element method (FEM) tools is proposed to investigate the structural response of an ecosustainable sailing yacht to different loading conditions, typical of those acting during regattas. The boat is, in particular, a 4.60 m dinghy with the hull and the deck made of an hybrid flax-cork sandwich and internal reinforcements made of marine plywood. A preliminary activity has consisted in the refitting of an existing model in order to reduce the hull weight and to improve performances during manoeuvrings. These tasks have been interactively simulated in the virtual environment of the boat CAD model, where longitudinal and transversal reinforcements were enlightened and the maximum beam reduced. At the same time, results of FEM simulations on the modified model were analysed in order to verify the structural integrity. Shape modifications have been applied to the real model in laboratory and the resulting hull has been instrumented with strain gauges and tested under rigging conditions to validate the numerical procedure. Finally, the FEM model was used to predict the response of the boat to loading systems typical of sailing conditions.

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Assessing Human-Fluid-Structure Interaction for the International Moth

Cited by 3 publications

References 11 publications

Toward the development of a hydrofoil tailored to passively reduce its lift response to fluid load

Toward the development of a hydrofoil tailored to passively reduce its lift response to fluid load

Laser Powder Bed Fusion of a Topology Optimized and Surface Textured Rudder Bulb with Lightweight and Drag-Reducing Design

Using FEM simulation to predict structural performances of a sailing dinghy

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