Fluid structure interaction in high performance catamaran C-foils under load
2015 (English)In: 5th High Performance Yacht Design Conference, HPYD 2015, Royal Institution of Naval Architects , 2015, p. 171-179Conference paper, Published paper (Refereed)
Abstract [en]
An experimental technique to accurately quantify the deformation and the bend-twist coupling of high performance composite foils under fluid loading is presented. The experimental results are reproduced in a Computational Fluid Dynamic (CFD) environment to assess the impact of board deflection and changes in pitch angle on vertical force generated in the C-foils while sailing under increased hydrodynamic pressure. A three dimensional Digital Image Correlation (DIC) methodology suitable for use within a wind tunnel is developed. The technique allows for the measurement of full-field deflection during fluid-structure interaction (FSI) experiments. Combined with DIC technique, the C-foil tip vortex is investigated using Particle Image Velocimetry (PIV) to correlate the variation of the vortex position and strength to the deflection of the board. These techniques, combined with CFD investigations allow potential changes in structural behaviour to be assessed with regard to improving the performances of the foils in sailing conditions. Experimental results are presented for a high performance curved foil from a NACRA F20 catamaran tested within the University of Southampton RJ Mitchell wind tunnel. The fluid regime is chosen to have a Reynolds number equivalent to light upwind sailing conditions (Rn=6.66x105 : boat speed of 6 knots) with a fifth of the fluid loading experienced in the water. Curved foils provide both a hydrodynamic side-force to counteract the aerodynamic forces of the sails and a vertical lift force to reduce the wetted surface area and hence the resistance. It is therefore necessary to investigate from a sailor point of view the influences of the side force and vertical coefficients that the change in effective angle of attack and of pitch will give to the stability and the performances of the catamaran.
Place, publisher, year, edition, pages
Royal Institution of Naval Architects , 2015. p. 171-179
Keywords [en]
Aerodynamics, Angle of attack, Bending (deformation), Computational fluid dynamics, Fluid dynamics, Hydrodynamics, Reynolds number, Velocity measurement, Vortex flow, Wind tunnels, Yachts, Experimental techniques, High performance composites, Hydrodynamic pressure, Particle image velocimetries, Structural behaviour, Three-dimensional digital image correlations, University of Southampton, Wetted surface area, Fluid structure interaction
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:ri:diva-71895Scopus ID: 2-s2.0-84971283662OAI: oai:DiVA.org:ri-71895DiVA, id: diva2:1838513
Conference
5th High Performance Yacht Design Conference, HPYD 2015, 8 March 2015 through 12 March 2015
2024-02-162024-02-162024-02-16Bibliographically approved