Experimental and theoretical study of the effect of hull roughness on ship resistance

Song, Soonseok and Dai, Saishuai and Demirel, Yigit Kemal and Atlar, Mehmet and Day, Sandy and Turan, Osman (2021) Experimental and theoretical study of the effect of hull roughness on ship resistance. Journal of Ship Research, 65 (1). pp. 62-71. ISSN 0022-4502

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Abstract

Hull roughness increases ship frictional resistance and thus results in economic and environmental penalties. Its effect has been prevalently predicted using the similarity law scaling procedure, presented by Granville (1958; 1978). However, this method has not yet been validated with experimental data using a model ship. This paper presents an experimental investigation into the effect of roughness on ship resistance and provides a validation of the similarity law scaling, by using tank testing of a flat plate and a model ship. Both the plate and the ship were tested in smooth and rough surface conditions, respectively. For the rough surface conditions, sand grit (aluminium oxide abrasive powder) was applied on the surfaces of the flat plate and the ship model. The roughness functions of the rough surface were derived by using the results obtained from the flat plate tests. Using the roughness function and the flat plate towing test, the frictional resistance was extrapolated to the length of the model ship following the similarity law scaling procedure. The total resistance of the rough ship model was first predicted using the extrapolated frictional resistance and the result of the smooth ship model, and then compared with the results from the rough ship model. The predicted total resistance coefficients for the rough ship model showed good agreement with the measured total resistance coefficient of the rough ship model; thus proving the validity of using Granville’s similarity law scaling to extrapolate the roughness effect on ship resistance.

ORCID iDs

Song, Soonseok ORCID: https://orcid.org/0000-0002-7685-1026

Dai, Saishuai ORCID: https://orcid.org/0000-0002-9666-6346

Demirel, Yigit Kemal ORCID: https://orcid.org/0000-0001-6739-4911

Day, Sandy ORCID: https://orcid.org/0000-0001-6798-3468

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  Item type:	Article
  ID code:	71534
  Dates:	Date Event 17 March 2021 Published 31 August 2020 Published Online 9 February 2020 Accepted 3 July 2019 Submitted
  Keywords:	roughness effect, model ship towing test, Granville’s similarity law scaling, ship resistance, experimental fluid dynamics (EFD), Naval architecture. Shipbuilding. Marine engineering, Civil and Structural Engineering, Mechanical Engineering, Ocean Engineering, Applied Mathematics, Numerical Analysis
  Subjects:	Naval Science > Naval architecture. Shipbuilding. Marine engineering
  Department:	Faculty of Engineering > Naval Architecture, Ocean & Marine Engineering Strategic Research Themes > Ocean, Air and Space
  Depositing user:	Pure Administrator
  Date deposited:	24 Feb 2020 09:27
  Last modified:	30 Sep 2021 02:24
  URI:	https://strathprints.strath.ac.uk/id/eprint/71534