A new vortex lattice method for calculating the flow past yacht sails

Fiddes, SP; Gaydon, JH

doi:10.1016/s0167-6105(96)00068-2

Cited by 20 publications

(9 citation statements)

References 10 publications

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“…Fiddes and Gaydon, 1996;Gerhardt et al, 2011). Despite the development of more advanced models, the inviscid approach is still commonly used in the early design stage because it is very fast.…”

Section: Numerical Modelmentioning

confidence: 99%

Inviscid approach for upwind sails aerodynamics. How far can we go?

Aubin

Augier

Bot

et al. 2016

Journal of Wind Engineering and Industrial Aerodynamics

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a b s t r a c tThis work presents a full-scale experimental study of a yacht rig and sails in real upwind sailing conditions and a comparison with Fluid Structure Interaction (FSI) simulations with the ARAVANTI model (Finite Element Method for the structure and Vortex Lattice Method for the fluid). A specific on-board instrumentation system simultaneously measures loads in the rig and sails, sailing data (wind, boat attitude and speed) and the shape of sails in real navigation conditions (flying shape). Flying shape parameters are extracted using the camera-based VSPARS system to characterize the effects of sail trims and to be compared with the results of the simulation. The potential flow solver gives fast and accurate predictions of both the flying shape and the loads in the rig in most conditions. The inviscid approach, commonly used in the early stage of design, must be checked, as in particular cases where the sails are heavily loaded, flow separation is significant and results from a potential flow solver are inaccurate. A new version of the model including the heel angle as an additional degree of freedom in the structural solver enables to detect when the inviscid flow approach overestimates the aerodynamic load. This upgrade improves the utility and reliability of the inviscid flow approach which remains relevant at the early stages of design as it is much more cost-effective than RANS models.

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Section: Numerical Modelmentioning

confidence: 99%

Inviscid approach for upwind sails aerodynamics. How far can we go?

Aubin

Augier

Bot

et al. 2016

Journal of Wind Engineering and Industrial Aerodynamics

View full text Add to dashboard Cite

show abstract

“…However, approximate means of simulating the separation over yacht sails using potential flow calculations have been developed (Cyr & Newman, 1996). Fiddes & Gaydon (1996) used a vortex lattice method to calculate the flow past yacht sails. The calculation of viscous flow about yacht sails in two dimensions has been performed by Jackson & Fiddes (1999).…”

Section: Introductionmentioning

confidence: 99%

Fluid–structure interaction of a two-dimensional membrane in a flow with a pressure gradient with application to convertible car roofs

Knight

Lucey

Shaw³

2010

Journal of Wind Engineering and Industrial Aerodynamics

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The flow-induced deformation of a membrane in a flow with a pressure gradient is studied. The investigation focuses on the deformation of aerodynamically loaded convertible car roofs. A computational methodology is developed with a line-element structural model that incorporates initial slackness of the flexible roof material. The computed flow-structure interaction yields stable solutions, the flexible roof settling into static equilibrium. The interaction converges to a static deformation within 1% difference in the displacement variable after three iterations between fluid and structural codes. Reasonably accurate predictions, to within 7%, are possible using only a single iteration between the fluid and the structural codes for the model problem studied herein. However, the deformation results are shown to be highly dependent on the physical parameters that are used in the calculation. Accurate representation of initial geometry, material properties and slackness should be found before the predictive benefits of the fluid-structure computations are sought. The iterative methodology overcomplicates the computation of deformation for the relatively small displacements encountered for the model problem studied herein. Such an approach would be better suited to applications with large amplitude displacements such as those encountered in sail design or deployment of a parachute.

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“…As with the panel methods, computational efficiency necessary for optimization can be maintained with the vortex lattice method. 7 A vortex lattice method has been applied to ship propellers 8 and to airplane propellers and has been shown to accurately predict performance in appropriate applications. 9,10 The airplane propeller analysis reported in Ref.…”

Section: Introductionmentioning

confidence: 99%

Wind Turbine Airfoil Performance Optimization Using the Vortex Lattice Method and a Genetic Algorithm

Burger

Hartfield

2006

4th International Energy Conversion Engineering Conference and Exhibit (IECEC)

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This paper examines the viability of using the combination of the vortex lattice method for aerodynamic performance prediction with a genetic algorithm for the optimization of the aerodynamic performance of horizontal axis wind turbine blades. The work described in this paper includes the adaptation of a vortex lattice code designed to predict propeller performance to wind turbine performance prediction and the optimization process including results for both single point and multipoint design optimization efforts.

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A new vortex lattice method for calculating the flow past yacht sails

Cited by 20 publications

References 10 publications

Inviscid approach for upwind sails aerodynamics. How far can we go?

Inviscid approach for upwind sails aerodynamics. How far can we go?

Fluid–structure interaction of a two-dimensional membrane in a flow with a pressure gradient with application to convertible car roofs

Wind Turbine Airfoil Performance Optimization Using the Vortex Lattice Method and a Genetic Algorithm

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