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

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    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

    Keywords

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

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  • 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 http://www.marinepropulsors.com/proceedings/2015/MB4-2.pdf