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

9 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.",
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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

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SN - 0029-8018

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