Open and ducted propeller virtual mass and damping coefficients by URANS-method in straight and oblique flow

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

    Research output: Contribution to journalArticleScientificpeer-review

    10 Citations (Scopus)

    Abstract

    The virtual mass and damping coefficients of an open and ducted propeller are determined using URANS computations. Time-accurate simulations are carried out for an open propeller forced to harmonic motion in two separate directions, translational x1- and rotational x4- directions. The analysis produces the diagonal coefficients of the virtual mass m11, m44 together with the diagonal damping terms c11, c44. The cross-terms m14, m41 and c14, c41 are also evaluated. A range of advance numbers is considered in the simulations. Several excitation frequencies and amplitudes are applied in order to determine the impact of viscosity on the vibrational coefficients. Oblique flow cases are also considered and the related virtual mass and damping coefficients are analyzed. The computed cases are compared to potential flow simulations and to published semi-empirical results. The average magnitudes of the coefficients correspond quite reasonably to those computed by the CFD method. However, the viscous effects are found to have a certain impact on some coefficients.
    Original languageEnglish
    Pages (from-to)92-102
    Number of pages11
    JournalOcean Engineering
    Volume130
    DOIs
    Publication statusPublished - 2017
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Propellers
    Damping
    Potential flow
    Flow simulation
    Computational fluid dynamics
    Viscosity

    Keywords

    • URANS
    • added mass
    • propeller
    • CFD
    • damping coefficients
    • vibration

    Cite this

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    title = "Open and ducted propeller virtual mass and damping coefficients by URANS-method in straight and oblique flow",
    abstract = "The virtual mass and damping coefficients of an open and ducted propeller are determined using URANS computations. Time-accurate simulations are carried out for an open propeller forced to harmonic motion in two separate directions, translational x1- and rotational x4- directions. The analysis produces the diagonal coefficients of the virtual mass m11, m44 together with the diagonal damping terms c11, c44. The cross-terms m14, m41 and c14, c41 are also evaluated. A range of advance numbers is considered in the simulations. Several excitation frequencies and amplitudes are applied in order to determine the impact of viscosity on the vibrational coefficients. Oblique flow cases are also considered and the related virtual mass and damping coefficients are analyzed. The computed cases are compared to potential flow simulations and to published semi-empirical results. The average magnitudes of the coefficients correspond quite reasonably to those computed by the CFD method. However, the viscous effects are found to have a certain impact on some coefficients.",
    keywords = "URANS, added mass, propeller, CFD, damping coefficients, vibration",
    author = "Jussi Martio and Antonio S{\'a}nchez-Caja and T. Siikonen",
    year = "2017",
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    language = "English",
    volume = "130",
    pages = "92--102",
    journal = "Ocean Engineering",
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    publisher = "Elsevier",

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    Open and ducted propeller virtual mass and damping coefficients by URANS-method in straight and oblique flow. / Martio, Jussi; Sánchez-Caja, Antonio (Corresponding Author); Siikonen, T.

    In: Ocean Engineering, Vol. 130, 2017, p. 92-102.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Open and ducted propeller virtual mass and damping coefficients by URANS-method in straight and oblique flow

    AU - Martio, Jussi

    AU - Sánchez-Caja, Antonio

    AU - Siikonen, T.

    PY - 2017

    Y1 - 2017

    N2 - The virtual mass and damping coefficients of an open and ducted propeller are determined using URANS computations. Time-accurate simulations are carried out for an open propeller forced to harmonic motion in two separate directions, translational x1- and rotational x4- directions. The analysis produces the diagonal coefficients of the virtual mass m11, m44 together with the diagonal damping terms c11, c44. The cross-terms m14, m41 and c14, c41 are also evaluated. A range of advance numbers is considered in the simulations. Several excitation frequencies and amplitudes are applied in order to determine the impact of viscosity on the vibrational coefficients. Oblique flow cases are also considered and the related virtual mass and damping coefficients are analyzed. The computed cases are compared to potential flow simulations and to published semi-empirical results. The average magnitudes of the coefficients correspond quite reasonably to those computed by the CFD method. However, the viscous effects are found to have a certain impact on some coefficients.

    AB - The virtual mass and damping coefficients of an open and ducted propeller are determined using URANS computations. Time-accurate simulations are carried out for an open propeller forced to harmonic motion in two separate directions, translational x1- and rotational x4- directions. The analysis produces the diagonal coefficients of the virtual mass m11, m44 together with the diagonal damping terms c11, c44. The cross-terms m14, m41 and c14, c41 are also evaluated. A range of advance numbers is considered in the simulations. Several excitation frequencies and amplitudes are applied in order to determine the impact of viscosity on the vibrational coefficients. Oblique flow cases are also considered and the related virtual mass and damping coefficients are analyzed. The computed cases are compared to potential flow simulations and to published semi-empirical results. The average magnitudes of the coefficients correspond quite reasonably to those computed by the CFD method. However, the viscous effects are found to have a certain impact on some coefficients.

    KW - URANS

    KW - added mass

    KW - propeller

    KW - CFD

    KW - damping coefficients

    KW - vibration

    UR - http://www.scopus.com/inward/record.url?scp=85002747150&partnerID=8YFLogxK

    U2 - 10.1016/j.oceaneng.2016.11.068

    DO - 10.1016/j.oceaneng.2016.11.068

    M3 - Article

    VL - 130

    SP - 92

    EP - 102

    JO - Ocean Engineering

    JF - Ocean Engineering

    SN - 0029-8018

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