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

J. Martio, A. Sánchez-Caja, T. Siikonen

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
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

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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
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. 2015.
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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 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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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. 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. 2015.

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

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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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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. 2015