A numerical investigation on the nominal wake of KVLCC2 model ship in regular head waves

Shin, Hye‐Rim; Paik, Kwang-Jun; Jang, Yoonho; Eom, Myeoung-Jin; Lee, Sungwook

doi:10.1016/j.ijnaoe.2020.01.001

Cited by 12 publications

(2 citation statements)

References 8 publications

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“…The wave height of the corresponding frequency can be obtained using Equation (16). Under the assumption of deep-water conditions, the wave number can be calculated as Equation (17), and the corresponding wavelength frequency can be calculated in the spectrum as Equation (18). In addition, to superimpose regular waves, it is necessary to select the range and interval of the frequency to be used.…”

Section: S( Fmentioning

confidence: 99%

A Numerical Study on the Performance of the 66k DWT Bulk Carrier in Regular and Irregular Waves

Kim,

Hwang,

Lee

et al. 2023

JMSE

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Accurate resistance performance evaluation is essential to predict the minimum propulsion horsepower required for ships in real sea. Therefore, in this paper, the added resistance performance of K-Supramax in various wave conditions was calculated using CFD (Computational Fluid Dynamics). First, to compare the resistance performance according to the DOF (Degree of Freedom), the added resistance performance in the head regular wave was investigated and compared with the experiment. The 2DOF and 6DOF results in the head regular wave had no significant differences. Second, to compare the resistance performance among various wave conditions, the effect of the heading angle was analyzed by comparing resistance and motion RAOs (Response Amplitude Operators) in bow quartering sea conditions using 6DOF. The added resistance showed the highest value near the resonance frequency of 170°. As the heading angle increased, the added resistance tended to decrease, regardless of the wavelength ratio. Also, the added resistance performance in irregular waves was investigated with reference to the adverse conditions. The spectral method, which linearly superimposes regular wave results, and the added resistance generated during irregular waves directly through CFD were compared. The resistance in irregular waves increased by approximately 92% for the spectral method and by approximately 72% for the direct irregular wave calculation compared to the resistance in calm water. In addition, the PSD (Power Spectral Density) of resistance and the distribution of motion RAOs obtained from direct irregular wave calculations were investigated.

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Section: S( Fmentioning

confidence: 99%

A Numerical Study on the Performance of the 66k DWT Bulk Carrier in Regular and Irregular Waves

Kim,

Hwang,

Lee

et al. 2023

JMSE

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“…The study and analysis of ship navigation performance from the perspective of flow details and flow mechanics are increasingly valued by researchers in various countries. Researchers hope that the study of flow field mechanics can reveal the inherent reasons for changes in hydrodynamic integral macroscopic quantities related to force, displacement, angles of rotation, amplitude, response, sound levels and other aspects involved in ship navigation performance [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Influence of Load Conditions on the Propeller Wake Evolution

Yu,

Wang,

Liu

et al. 2023

JMSE

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The present work presents numerical research on the wake flows behind a propeller operating under three advance coefficients. Large eddy simulations are adopted to obtain the viscous flow information behind the propeller. In particular, the study highlights the comparison of the evolution characteristics and the flow physics within the propeller wakes with three advance coefficients. The predicted global force and moment coefficients and phase-average statistics of streamwise velocity agree well with the available experimental data. Compared to all other flow structures in the wake, the tip vortices are found to play the most significant role according to the results. During the pairing process of adjacent tip vortices, the tip vortices diffuse circumferentially, leading to enhanced mutual-induction effects. When the advance coefficient is low, the wake becomes distorted, and the pairing process takes place in the middle region of the flow field. As a result of their unstable motion, the four tip vortices generated by the propeller cannot be distinguished individually in the far field. Instead, they break down into smaller vortices and tend to distribute themselves uniformly in the azimuthal direction. The increase in the advance coefficient delays the pairing process. This study offers valuable insights for the design and optimization of marine propellers.

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CFD study of hull wakes in oblique flow at model and full scales

Zhang

Lai

et al. 2021

Applied Ocean Research

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A numerical investigation on the nominal wake of KVLCC2 model ship in regular head waves

Cited by 12 publications

References 8 publications

A Numerical Study on the Performance of the 66k DWT Bulk Carrier in Regular and Irregular Waves

A Numerical Study on the Performance of the 66k DWT Bulk Carrier in Regular and Irregular Waves

Influence of Load Conditions on the Propeller Wake Evolution

CFD study of hull wakes in oblique flow at model and full scales

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