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

A. Sánchez-Caja (Corresponding Author), J. Martio, T. Siikonen

    Research output: Contribution to journalArticleResearchpeer-review

    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.

    LanguageEnglish
    JournalJournal of Marine Science and Technology (Japan)
    DOIs
    Publication statusAccepted/In press - 1 Jan 2018
    MoE publication typeNot Eligible

    Fingerprint

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

    Keywords

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

    OKM Publication Types

    • A1 Refereed journal article

    OKM Open Access Status

    • 0 Not Open Access

    ASJC Scopus subject areas

    • Oceanography
    • Ocean Engineering
    • Mechanics of Materials
    • Mechanical Engineering

    Cite this

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    title = "A coupled potential–viscous flow approach for the prediction of propeller effective wakes in oblique flow",
    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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    author = "A. S{\'a}nchez-Caja and J. Martio and T. Siikonen",
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    AU - Martio, J.

    AU - Siikonen, T.

    PY - 2018/1/1

    Y1 - 2018/1/1

    N2 - 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.

    AB - 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.

    KW - Coupling error

    KW - CRP

    KW - Effective wake

    KW - Oblique or inclined flow

    KW - Pod propulsor

    KW - Potential flow

    KW - RANS

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