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An investigation into the resistance components of high speed displacement catamarans

An investigation into the resistance components of high speed displacement catamarans
An investigation into the resistance components of high speed displacement catamarans

High speed displacement and semi-displacement catamarans have received considerable attention during the last two decades and a number of such vessels, mainly passenger ferries, have been built. This thesis describes an experimental and theoretical investigation into the resistance components in calm water of these types of craft with symmetric demihulls. Total resistance, running trim, sinkage measurements and wave pattern analysis based on multiple longitudinal cut techniques were carried out for five hull forms: a conventional hull form, a mathematically defined hull form (Wigley hull) both in fixed and free to trim and sink conditions and three round bilge hulls derived from the NPL round bilge series. The tests were conducted over a Froude number range of 0.2 to 1.0 and separation to length ratio range of 0.2 to 0.6, resulting in 31 catamaran configurations. Wake traverse analysis was also carried out for the Wigley model and one round bilge model. Interference resistance effects for both the wave pattern and the viscous components were derived. A theoretical method based on linearised wave resistance theory was developed, and a prediction method for the wave pattern resistance of the catamaran using the wave pattern analysis of the demihull was investigated. Both methods were applied to the models and compared with the experimental results. The results of the investigation provide a better understanding of the components of catamaran resistance including the influence of hull separation and length to beam ratio over a wide range of Froude numbers. Conclusions are drawn from the results of the interference effects on both wave resistance and viscous resistance. Comparisons between the experimental results and theoretical predictions are used to assess the suitability of the theoretical methods. Finally, overall observations are made on the components of catamaran resistance, on suitable scaling procedures and on practical prediction methods.

University of Southampton
Insel, Mustafa
Insel, Mustafa

Insel, Mustafa (1990) An investigation into the resistance components of high speed displacement catamarans. University of Southampton, Doctoral Thesis.

Record type: Thesis (Doctoral)

Abstract

High speed displacement and semi-displacement catamarans have received considerable attention during the last two decades and a number of such vessels, mainly passenger ferries, have been built. This thesis describes an experimental and theoretical investigation into the resistance components in calm water of these types of craft with symmetric demihulls. Total resistance, running trim, sinkage measurements and wave pattern analysis based on multiple longitudinal cut techniques were carried out for five hull forms: a conventional hull form, a mathematically defined hull form (Wigley hull) both in fixed and free to trim and sink conditions and three round bilge hulls derived from the NPL round bilge series. The tests were conducted over a Froude number range of 0.2 to 1.0 and separation to length ratio range of 0.2 to 0.6, resulting in 31 catamaran configurations. Wake traverse analysis was also carried out for the Wigley model and one round bilge model. Interference resistance effects for both the wave pattern and the viscous components were derived. A theoretical method based on linearised wave resistance theory was developed, and a prediction method for the wave pattern resistance of the catamaran using the wave pattern analysis of the demihull was investigated. Both methods were applied to the models and compared with the experimental results. The results of the investigation provide a better understanding of the components of catamaran resistance including the influence of hull separation and length to beam ratio over a wide range of Froude numbers. Conclusions are drawn from the results of the interference effects on both wave resistance and viscous resistance. Comparisons between the experimental results and theoretical predictions are used to assess the suitability of the theoretical methods. Finally, overall observations are made on the components of catamaran resistance, on suitable scaling procedures and on practical prediction methods.

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Published date: 1990

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Local EPrints ID: 462776
URI: http://eprints.soton.ac.uk/id/eprint/462776
PURE UUID: 06f10f53-b10b-4514-b4c2-f9ccc870b40c

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Date deposited: 04 Jul 2022 19:59
Last modified: 04 Jul 2022 21:31

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Author: Mustafa Insel

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