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 200 mm 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.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    An experimental study of unsteady hydrodynamics of a single scull


    Beteiligte:
    Day, A H (Autor:in) / Campbell, I (Autor:in) / Clelland, D (Autor:in) / Cichowicz, J (Autor:in)


    Erscheinungsdatum :

    2011-08-01


    Format / Umfang :

    13 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





    SCULL COMBINED USE CANOE

    CHAE SUNG ZIN / JUNG SANG HYUN / PARK SOL MON et al. | Europäisches Patentamt | 2022

    Freier Zugriff

    Imitation scull boat based on driving of dielectric elastomer

    ZHANG MINGYI / WANG YAWU / MAO DUN et al. | Europäisches Patentamt | 2023

    Freier Zugriff

    VOF-Dynamic Mesh Simulations of Unsteady Ship Hydrodynamics

    Visone, M. / Ausonio, C. F. P. L. / Bertetti, P. et al. | British Library Conference Proceedings | 2005


    General-Purpose Parallel Unsteady Rans Ship Hydrodynamics Code: CFDSHIP- Iowa

    E. G. Paterson / R. V. Wilson / F. Stern | NTIS | 2003