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• W1041910879 abstract "Within the yacht testing community there has been a continuing interest in andconcern with, the effectiveness of techniques used to extrapolate model scale resis-tance tests to full scale values. While there are many aspects which influence theeffectiveness of scaling results from model yacht experiments; this thesis has inves-tigated the use of hot-films to characterise boundary layer state so as to provideguidance in selection of model scale. A primary focus of this thesis was to ensurethe method selected to characterise the boundary layer was suitable for commercialtesting programs. The methodology included a robust technique for the installationand application of glue-on hot-film sensors and a modified data analysis method.The hull form used for this research was based on an International America's CupClass yacht. The hull type has several features desirable in researching yacht hy-drodynamics including; non-immersed transom, minimal distortion to the hull linesand high aspect ratio foils. From data obtained from the hot-film sensors a series of conclusions were made.With turbulence stimulation, the on body flow was found to be fully turbulentfor all Froude numbers tested (0.05 to 0.46). This implies that with appropriateboundary layer stimulation, the state of the boundary layer is not a limiting factorin the testing of a 1/8th scale IACC yacht model. The hot-film data also showedthat the change in Cf due to waves generated by the hull were half that of thechange due to natural transition. The lower limits of applicability of the Grigsonflat plate friction line were also examined using this experimental data. For the1/8th scale model tested these limits lie at a model ReL = 2:6 _ 106 (Froude num-ber of 0.27) as opposed to that reported in his paper as ReL = 1:5 _ 106 (Froudenumber of 0.15). In general it was concluded that if a yacht hull-form is slender with fair lines and no immersed transom and testing is at model speeds above 1.28 m/s (Froude numberof 0.27) then it is possible to use a simple analytical approach to decide the correctmodel scale. If there is concern that there might be an issue with transition be-haviour it has been shown that it is possible and relatively simple to use hot-filmsto verify the boundary layer state." @default.
• W1041910879 created "2016-06-24" @default.
• W1041910879 creator A5081371616 @default.
• W1041910879 date "2014-07-01" @default.
• W1041910879 modified "2023-09-27" @default.
• W1041910879 title "The use of hot-films to characterise flow regimes on a sailing yacht hull-guidance for scaling" @default.
• W1041910879 hasPublicationYear "2014" @default.
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