RANSE-CFD Simulation of Rigid Multiple Sails
Résumé
The numerical simulation of the flow around sails addressed here forms part of the challenging objective of the full-scale simulation with the help of a single tool of a complete high performance sailing boat including hull, appendages (foils, rudders), sails and masts. Parallel to sailing boats design, sail is also a topical subject as a promising solution for auxiliary zero-emission propulsion system for marine vehicles. The numerical simulations are conducted with ISIS-CFD, the unstructured Reynolds-averaged Navier-Stokes solver developed at the LHEEA Laboratory. This flow solver is aimed at the simulation of realistic flow problems in all branches of marine hydrodynamics. The case studied still in progress concerns multiple sails with a genoa and a mainsail in upwind condition as experimented in the University of Auckland's Twisted Flow Wind Tunnel. Forces and pressure distributions in different sections are available at various trim angles to find the optimum. The focus of the present study is to compare CFD with aforementioned EFD (Experimental Fluid Dynamics) and to address opened questions in order to find best practices in general for reliable computation of rigid sails. One and two equations turbulence modelling have been used and compared simulations: the Spalart-Allmaras model, the isotropic k-ω SST model of Menter and our non-isotropic EARSM model. DES (Detached Eddy Simulation) approach based on the k-ω model has also been considered as hybrid RANS-LES modelling in the context of unstructured finite-volume grids.
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