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An experimental study of unsteady hydrodynamics of a single scull

Day, Alexander and Campbell, Ian and Clelland, David and Cichowicz, Jakub (2011) An experimental study of unsteady hydrodynamics of a single scull. Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment, 225 (3). pp. 282-294. ISSN 1475-0902

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    Abstract

    The effect of hull dynamics on the hydrodynamic performance of a single scull is investigated via a combination of field trials and tank tests. The location of laminar-turbulent transition in unsteady flow is explored via several series of hot-film measurements on the bow of a full-scale single scull in unsteady flow in both towing tank and field-trial conditions. Results demonstrate that the measured real-world viscous-flow behaviour can be successfully reproduced in the tank using an oscillating sub-carriage to reproduce the surging motion measured in the field trials. It can be seen that there is a strong link between turbulence and acceleration; results show that the link is relatively insensitive to mean velocity, but that small changes in acceleration time-histories can have a marked effect, as can the presence of small waves. The impact of the location of laminar turbulent transition is investigated by way of a series of resistance tests, both with free transition and with transition forced by turbulence stimulation at two different locations. Results indicate that an aft movement of 200mm of the location of transition can reduce resistance by almost 0.5 per cent. Unsteady tests using the oscillating sub-carriage indicate that unsteady effects add around 3 per cent to the total mean resistance with free transition.

    Item type: Article
    ID code: 35941
    Notes: Invited paper for special Edition of Journal of Engineering for the Maritime Environment on Maritime Performance Sport.
    Keywords: hydrodynamics, rowing, hull resistance,, boundary-layer transition, tank tests, field trials , unsteady speed, Naval architecture. Shipbuilding. Marine engineering, Mechanical Engineering, Ocean Engineering
    Subjects: Naval Science > Naval architecture. Shipbuilding. Marine engineering
    Department: Faculty of Engineering > Naval Architecture and Marine Engineering
    Related URLs:
      Depositing user: Pure Administrator
      Date Deposited: 16 Nov 2011 16:03
      Last modified: 06 Sep 2014 07:01
      URI: http://strathprints.strath.ac.uk/id/eprint/35941

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