Sail Performance Analysis of Sailing Yachts by Numerical Calculations and Experiments

Tahara, Yusuke; Masuyama, Yutaka; Fukasawa, Tomonori; Katori, Masanobu

doi:10.5772/28440

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…This happens mainly because downwind sails are made of very light and flexible cloth, and are attached to the yacht's structure at three points, namely, the head, the clew, and the tack [20]. The shape of a downwind sail is formed by self-generated aerodynamic forces that are strongly affected by the sail shape itself [21]. Moreover, the shape can change remarkably when sailing, depending on the trim settings and wind conditions [7].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the shape can change remarkably when sailing, depending on the trim settings and wind conditions [7]. All of these aspects must be taken into account when simulating the real sailing conditions of these kinds of sails, and the sail shape must be accurately measured in the flying condition [10,21]. For this purpose, nowadays, several authors focus on the issue of predicting the flying shape a sail develops under the impact of flow forces.…”

Section: Introductionmentioning

confidence: 99%

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Improving the Downwind Sail Design Process by Means of a Novel FSI Approach

Cirello

Ingrassia

Mancuso

et al. 2021

JMSE

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The process of designing a sail can be a challenging task because of the difficulties in predicting the real aerodynamic performance. This is especially true in the case of downwind sails, where the evaluation of the real shapes and aerodynamic forces can be very complex because of turbulent and detached flows and the high-deformable behavior of structures. Of course, numerical methods are very useful and reliable tools to investigate sail performances, and their use, also as a result of the exponential growth of computational resources at a very low cost, is spreading more and more, even in not highly competitive fields. This paper presents a new methodology to support sail designers in evaluating and optimizing downwind sail performance and manufacturing. A new weakly coupled fluid–structure interaction (FSI) procedure has been developed to study downwind sails. The proposed method is parametric and automated and allows for investigating multiple kinds of sails under different sailing conditions. The study of a gennaker of a small sailing yacht is presented as a case study. Based on the numerical results obtained, an analytical formulation for calculating the sail corner loads has been also proposed. The novel proposed methodology could represent a promising approach to allow for the widespread and effective use of numerical methods in the design and manufacturing of yacht sails.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improving the Downwind Sail Design Process by Means of a Novel FSI Approach

Cirello

Ingrassia

Mancuso

et al. 2021

JMSE

View full text Add to dashboard Cite

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Study on a Comprehensive Energy-Saving Sail by CFD Method

Zheng¹,

Liu²,

An³

et al. 2016

OJFD

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A comprehensive energy-saving sail (CES) has been proposed in order to promote energy saving and emission reduction from shipping. Wind energy is harvested for propulsion and electrical generator at the same time by a unique structure of CES. A CFD (Computational Fluid Dynamics) code is verified by a case of arc wind sail, and it is used to simulate the pressure and velocity around the CES. The results show that the outlet velocity of air tunnel V o and wind velocity V i serve as an equation V o ≈ 1.31V i , which means the CES can effectively improve the conversion efficiency. In addition, it is found that V o increases with the tunnel diameter to some extend over which it will keep almost constant.

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Sail Performance Analysis of Sailing Yachts by Numerical Calculations and Experiments

Cited by 2 publications

References 12 publications

Improving the Downwind Sail Design Process by Means of a Novel FSI Approach

Improving the Downwind Sail Design Process by Means of a Novel FSI Approach

Study on a Comprehensive Energy-Saving Sail by CFD Method

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