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On the Uncertainty of CFD in Sail Aerodynamics

Article dans une revue avec comité de lecture
Author
VIOLA, Ignazio Maria
252912 Newcastle University [Newcastle]
ccBOT, Patrick
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
RIOTTE, Matthieu
252912 Newcastle University [Newcastle]

URI
http://hdl.handle.net/10985/8697
DOI
10.1002/fld.3780
Date
2013
Journal
International Journal for Numerical Methods in Fluids

Abstract

A verification and validation procedure for yacht sail aerodynamics is presented. Guidelines and an example of application are provided. The grid uncertainty for the aerodynamic lift, drag and pressure distributions for the sails is computed. The pressures are validated against experimental measurements, showing that the validation procedure may allow the identification of modelling errors. Lift, drag and L2 norm of the pressures were computed with uncertainties of the order of 1%. Convergence uncertainty and round-off uncertainty are several orders of magnitude smaller than the grid uncertainty. The uncertainty due to the dimension of the computational domain is computed for a flat plate at incidence and is found to be significant compared with the other uncertainties. Finally, it is shown how the probability that the ranking between different geometries is correct can be estimated knowing the uncertainty in the computation of the value used to rank.

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