CFD verification and validation of added resistance and motions of KVLCC2 with fixed and free surge in short and long head waves

Sadat-Hosseini, Hamid; Wu, Pengfei; Carrica, Pablo M.; Kim, Ho; Toda, Yasuyuki; Stern, Frederick

doi:10.1016/j.oceaneng.2012.12.016

Cited by 160 publications

(47 citation statements)

References 19 publications

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“…Experiments were performed by Sadat-Hosseini, Wu et al [12] to obtain wake data in three different wavelengths in head sea condition at design speed. A model of KVLCC2 was used for this purpose with the model scale of 1:100.…”

Section: Wake Data In Presence Of Wavesmentioning

confidence: 99%

“…Timevarying wake data in three different head waves provided by Sadat-Hosseini, Wu et al [12] have been used. Effect of various factors affecting propeller performance in waves like wake change, ship motions, wave dynamic pressure, added resistance and RPM fluctuation has been studied separately to decide the order of importance of each factor.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of waves on cavitation and pressure pulses

Taskar

Steen

Bensow

et al. 2016

Applied Ocean Research

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In view of environmental concerns, there is increasing demand to optimize the ships for the actual operating condition rather than for calm water. Now, in order to apply this for propeller design, a first step would be to study the effects of waves on propeller operation. Therefore, the aim of this paper is to identify and quantify the effect of various factors affecting the propeller in waves. The performance of KVLCC2 propeller in the presence of three different waves has been compared with calm water performance. Changes in performance in terms of cavitation, pressure pulses, and efficiency have been studied. Significant increase in pressure pulses has been observed due to wake change in waves even though cavitation did not show any significant change. An analysis using cavitation bucket diagram in different wave conditions indicates that a propeller optimized for calm water wake may perform much worse in presence of waves. Therefore, having wake variation at least in critical wave conditions (where the wavelength is close to ship length) in addition to calm water wake could be very useful to ensure that the propeller performs equally well in presence of waves.

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Section: Wake Data In Presence Of Wavesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of waves on cavitation and pressure pulses

Taskar

Steen

Bensow

et al. 2016

Applied Ocean Research

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show abstract

“…SHI et al [3] used the hybrid grids, fewer structured grids far away from the hull, and refinement of unstructured grids near the hull, to calculate the resistance of INSEAN2340. Sadat-Hosseini et al [4] used the RANS method and free surface tracking method to predict the resistance of KVLCC2 and discussed the pitch and heave of hull in waves. The results of calculation were in good agreement with the experimental data.…”

Section: Introductionmentioning

confidence: 99%

Uncertainty Analysis in CFD for Resistance

Wang¹,

Liu²,

Zhang³

et al. 2017

JSOE

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Based on the Latin square design of statistics, the thickness of first boundary layer, the turbulence model and the cell number were taken as the three main factors of uncertainty in CFD (computational fluid dynamics). Total resistance of hull was calculated and the flow field around the hull was simulated by CFD method. Then, the influence of uncertainty factors on the hull resistance was discussed by regression analysis with trimmed mesh and overset mesh. Through a series of calculation and analysis, the optimal calculation method was put forward, and the relevant parameters of the calculation were determined. Thirdly, the total resistance of different speed was calculated by using these two kinds of grids, which were in good agreement with the experimental results. Finally, according to the ITTC recommended procedures, uncertainty analysis in CFD was carried out with the numerical results of the total resistance by three sets of grids with uniform refinement ratio r G = √2. Then the modified resistance was compared with the experimental result, which improved the accuracy of the resistance prediction.

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“…In the CFD method, it is possible to investigate the details of flow characteristics such as pressure and velocity distribution, even for the violent freesurface flows that interact with a solid body. In addition, current numerical methods such as the volume-of-fluid (VOF) or level-set methods provide reliable results for violent free-surface problems in which the topology of the free-surface boundary is largely changed [12][13][14][15]. Furthermore, the CFD method can be utilized to study the added resistance in short waves of ships with different bow shapes above the still-water level.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of added resistance on blunt ships with different bow shapes in short waves

Yang

Kim

2016

J Mar Sci Technol

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In this paper, a Cartesian-grid method is applied to investigate the added resistance of KRISO's very large crude oil carrier hull with a different bow, particularly in short incident waves. The wavelength is fixed as half of the ship length in all computations. In the present numerical method, a first-order fractional-step method is applied to the velocity-pressure coupling in the fluid domain, and the volume-of-fluid method is adopted to capture the fluid interface. The ship is embedded in a Cartesian grid, and the volume fraction of the ship inside the grid is calculated to identify the different phases in each grid. The sensitivity of the time window during post-processing as well as the number of solution grids is investigated. The computed added resistance is compared with experimental data. In addition, the characteristics of the surge force for different wave amplitudes are observed by comparing the wave elevation around the bow. Further, to compare the relative magnitude of higher harmonic components with respect to the magnitude of the first harmonic component, harmonic analyses of the time history of the surge force are performed. Based on the present numerical results, the effects of the wave amplitude and bow shape on added resistance for a short wavelength are observed. Finally, the distribution characteristics of time-averaged added pressure on the ship surface are investigated for each bow shape and wave amplitude.

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CFD verification and validation of added resistance and motions of KVLCC2 with fixed and free surge in short and long head waves

Cited by 160 publications

References 19 publications

Effect of waves on cavitation and pressure pulses

Effect of waves on cavitation and pressure pulses

Uncertainty Analysis in CFD for Resistance

Numerical analysis of added resistance on blunt ships with different bow shapes in short waves

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