An effective method for comparing the turbulence intensity from LDA measurements and CFD predictions within a ship propeller jet

W.H. Lam, Desmond J. Robinson, Gerard A. Hamill, Harold T. Johnston

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    The mean velocity and turbulence intensity are the two main inputs to investigate the ship propeller induced seabed scouring resulting from a vessel is manoeuvring within a port where the underkeel clearances are low. More accurate data including the turbulence intensity is now available by using the laser doppler anemometry (LDA) measurement system and computational fluid dynamics (CFD) approach. Turbulence intensity has a loose definition, which is the velocity fluctuation as the root mean square (RMS) referenced to a mean flow velocity. However, the velocity fluctuation and mean velocity can be the overall value includingxy and z directions or the value of a single component. LDA and CFD results were obtained from two different acquisition systems (Dantec LDA system and Fluent CFD package) and therefore the outputs cannot be compared directly. An effective method is proposed for comparing the turbulence intensity between the experimental measurements and the computational predictions within a ship propeller jet. The flow patterns of turbulence intensity within a ship propeller jet are presented by using the LDA measurements and CFD results from turbulence models of standard k-e, RNG k-e, realizable ke, standard k?, SST k?and Reynolds stresses.

    LanguageEnglish
    Pages105-124
    Number of pages19
    JournalOcean Engineering
    Volume52
    Issue numbernull
    DOIs
    Publication statusPublished - 01 Oct 2012

    Fingerprint

    Ship propellers
    Computational fluid dynamics
    Turbulence
    Lasers
    Turbulence models
    Flow velocity
    Flow patterns

    Cite this

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    title = "An effective method for comparing the turbulence intensity from LDA measurements and CFD predictions within a ship propeller jet",
    abstract = "The mean velocity and turbulence intensity are the two main inputs to investigate the ship propeller induced seabed scouring resulting from a vessel is manoeuvring within a port where the underkeel clearances are low. More accurate data including the turbulence intensity is now available by using the laser doppler anemometry (LDA) measurement system and computational fluid dynamics (CFD) approach. Turbulence intensity has a loose definition, which is the velocity fluctuation as the root mean square (RMS) referenced to a mean flow velocity. However, the velocity fluctuation and mean velocity can be the overall value includingx, y and z directions or the value of a single component. LDA and CFD results were obtained from two different acquisition systems (Dantec LDA system and Fluent CFD package) and therefore the outputs cannot be compared directly. An effective method is proposed for comparing the turbulence intensity between the experimental measurements and the computational predictions within a ship propeller jet. The flow patterns of turbulence intensity within a ship propeller jet are presented by using the LDA measurements and CFD results from turbulence models of standard k-e, RNG k-e, realizable k–e, standard k–?, SST k–?and Reynolds stresses.",
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    An effective method for comparing the turbulence intensity from LDA measurements and CFD predictions within a ship propeller jet. / Lam, W.H.; Robinson, Desmond J.; Hamill, Gerard A.; Johnston, Harold T.

    In: Ocean Engineering, Vol. 52, No. null, 01.10.2012, p. 105-124.

    Research output: Contribution to journalArticle

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    AU - Robinson, Desmond J.

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    AU - Johnston, Harold T.

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