Evaluation of Propeller Virtual Mass and Damping Coefficients by URANS-Method

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    The virtual mass and damping coefficients of a rotating 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 for 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. The computed cases are
    compared to published semi-empirical results. The average magnitudes of the semi-empirical coefficient correspond quite reasonably to those computed by the CFD method. The viscous effects are found to have a certain impact in
    some coefficients.
    Original languageEnglish
    Title of host publicationProceedings of the Fourth International Symposium on Marine Propulsors - smp15 31 May - 4 June 2015, Austin, Texas, USA
    Place of PublicationAustin (Texas) USA
    Number of pages13
    Publication statusPublished - 2015
    MoE publication typeA4 Article in a conference publication
    Event4th International Symposium on Marine Propulsors, smp 15 - Austin, United States
    Duration: 31 May 20154 Jun 2015
    Conference number: 4

    Conference

    Conference4th International Symposium on Marine Propulsors, smp 15
    Abbreviated titlesmp 15
    CountryUnited States
    CityAustin
    Period31/05/154/06/15

    Fingerprint

    Propellers
    Damping
    Computational fluid dynamics
    Viscosity

    Keywords

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

    Cite this

    Martio, J., Sánchez-Caja, A., & Siikonen, T. (2015). Evaluation of Propeller Virtual Mass and Damping Coefficients by URANS-Method. In Proceedings of the Fourth International Symposium on Marine Propulsors - smp15 31 May - 4 June 2015, Austin, Texas, USA Austin (Texas) USA.
    Martio, J. ; Sánchez-Caja, A. ; Siikonen, T. / Evaluation of Propeller Virtual Mass and Damping Coefficients by URANS-Method. Proceedings of the Fourth International Symposium on Marine Propulsors - smp15 31 May - 4 June 2015, Austin, Texas, USA. Austin (Texas) USA, 2015.
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    title = "Evaluation of Propeller Virtual Mass and Damping Coefficients by URANS-Method",
    abstract = "The virtual mass and damping coefficients of a rotating 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 for 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. The computed cases arecompared to published semi-empirical results. The average magnitudes of the semi-empirical coefficient correspond quite reasonably to those computed by the CFD method. The viscous effects are found to have a certain impact insome coefficients.",
    keywords = "URANS, added mass, propeller, CFD, damping coefficients, vibration",
    author = "J. Martio and A. S{\'a}nchez-Caja and T. Siikonen",
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    language = "English",
    isbn = "978-0-9964594-4-0",
    booktitle = "Proceedings of the Fourth International Symposium on Marine Propulsors - smp15 31 May - 4 June 2015, Austin, Texas, USA",

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    Martio, J, Sánchez-Caja, A & Siikonen, T 2015, Evaluation of Propeller Virtual Mass and Damping Coefficients by URANS-Method. in Proceedings of the Fourth International Symposium on Marine Propulsors - smp15 31 May - 4 June 2015, Austin, Texas, USA. Austin (Texas) USA, 4th International Symposium on Marine Propulsors, smp 15, Austin, United States, 31/05/15.

    Evaluation of Propeller Virtual Mass and Damping Coefficients by URANS-Method. / Martio, J.; Sánchez-Caja, A.; Siikonen, T.

    Proceedings of the Fourth International Symposium on Marine Propulsors - smp15 31 May - 4 June 2015, Austin, Texas, USA. Austin (Texas) USA, 2015.

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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    T1 - Evaluation of Propeller Virtual Mass and Damping Coefficients by URANS-Method

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    AU - Siikonen, T.

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    N2 - The virtual mass and damping coefficients of a rotating 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 for 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. The computed cases arecompared to published semi-empirical results. The average magnitudes of the semi-empirical coefficient correspond quite reasonably to those computed by the CFD method. The viscous effects are found to have a certain impact insome coefficients.

    AB - The virtual mass and damping coefficients of a rotating 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 for 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. The computed cases arecompared to published semi-empirical results. The average magnitudes of the semi-empirical coefficient correspond quite reasonably to those computed by the CFD method. The viscous effects are found to have a certain impact insome coefficients.

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    KW - damping coefficients

    KW - vibration

    M3 - Conference article in proceedings

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    Martio J, Sánchez-Caja A, Siikonen T. Evaluation of Propeller Virtual Mass and Damping Coefficients by URANS-Method. In Proceedings of the Fourth International Symposium on Marine Propulsors - smp15 31 May - 4 June 2015, Austin, Texas, USA. Austin (Texas) USA. 2015