A coupled potential–viscous flow approach for the prediction of propeller effective wakes in oblique flow

Antonio Sánchez-Caja (Corresponding Author), Jussi Martio, T. Siikonen

    Research output: Contribution to journalArticleScientificpeer-review

    1 Citation (Scopus)

    Abstract

    This paper presents a method for the estimation of propeller effective wakes in oblique flows. It extends to inclined flows an approach based on correction factors previously developed for the estimation of effective wakes in straight flow. The approach converts propeller-induced velocities approximately predicted via potential flow theory into viscous-induced velocities on the basis of a viscous flow RANS analysis. The correction factors are a function of both the radial and angular positions on the propeller disk. They are calculated for a reference advance number and work accurately in a neighboring continuous region of advance numbers. This procedure allows controlling one of the errors present in the calculation of effective wakes, namely the error derived from coupling a potential flow method for the representation of the propeller with a RANS solver. Consequently, it permits calculating the effective wake more precisely in off-design conditions, reducing the CPU time, and therefore, enlarging its range of applicability to situations like those resulting from ship maneuvering. The approach is tested for a podded propulsor unit in oblique flow.

    Original languageEnglish
    Pages (from-to)799-811
    Number of pages13
    JournalJournal of Marine Science and Technology
    Volume24
    Issue number3
    DOIs
    Publication statusPublished - 13 Sep 2019
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Propellers
    potential flow
    Potential flow
    prediction
    viscous flow
    Viscous flow
    Program processors
    Ships
    method

    Keywords

    • Coupling error
    • CRP
    • Effective wake
    • Oblique or inclined flow
    • Pod propulsor
    • Potential flow
    • RANS

    Cite this

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    abstract = "This paper presents a method for the estimation of propeller effective wakes in oblique flows. It extends to inclined flows an approach based on correction factors previously developed for the estimation of effective wakes in straight flow. The approach converts propeller-induced velocities approximately predicted via potential flow theory into viscous-induced velocities on the basis of a viscous flow RANS analysis. The correction factors are a function of both the radial and angular positions on the propeller disk. They are calculated for a reference advance number and work accurately in a neighboring continuous region of advance numbers. This procedure allows controlling one of the errors present in the calculation of effective wakes, namely the error derived from coupling a potential flow method for the representation of the propeller with a RANS solver. Consequently, it permits calculating the effective wake more precisely in off-design conditions, reducing the CPU time, and therefore, enlarging its range of applicability to situations like those resulting from ship maneuvering. The approach is tested for a podded propulsor unit in oblique flow.",
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    A coupled potential–viscous flow approach for the prediction of propeller effective wakes in oblique flow. / Sánchez-Caja, Antonio (Corresponding Author); Martio, Jussi; Siikonen, T.

    In: Journal of Marine Science and Technology, Vol. 24, No. 3, 13.09.2019, p. 799-811.

    Research output: Contribution to journalArticleScientificpeer-review

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