Details

Autor(en) / Beteiligte

• Viola, I.M.
• Bot, P.
• Riotte, M.

Titel

On the uncertainty of CFD in sail aerodynamics

Ist Teil von

• International journal for numerical methods in fluids, 2013-08, Vol.72 (11), p.1146-1164

Ort / Verlag

Bognor Regis: Blackwell Publishing Ltd

Erscheinungsjahr

2013

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• SUMMARYA 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. Copyright © 2013 John Wiley & Sons, Ltd. A verification and validation procedure for yacht sail aerodynamics is presented. Guidelines and an example of application are provided. The importance of verification and validation to assess modelling error and ranking different deign candidates is discussed. In the presented example, lift, drag and L2 norm of the pressures were computed with uncertainties of the order of 1% with a number of cells of the order of one million.