Numerical investigation of scale effect in self-propelled container ship squat

Kok, Zhen; Duffy, Jonathan; Chai, Shuhong; Jin, Yuting; Javanmardi, Mohammadreza

doi:10.1016/j.apor.2020.102143

Cited by 10 publications

(3 citation statements)

References 21 publications

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“…Sinkage and trim are known to change relatively little with the Reynolds number. For example, Kok et al (2020) used CFD to investigate self-propelled squat and its scale effect. While they concluded that a negligible scale effect exists, an analysis of their results shows approximately 5% difference in dimensionless squat at model and fullscale, which is certainly non-negligible.…”

Section: Evidence To Support the Existence Of An Interaction Termmentioning

confidence: 99%

“…For example, the study on squat by Kok et al (2020) was carried out for very shallow water cases (depth to draught ratios as low as 1.1). Such studies are valuable because they reveal small but nevertheless important aspects of the physics of scale effects one might not have been able to detect in deep waters where the magnitude of sinkage and trim is typically much smaller.…”

Section: Shallow and Confined Watersmentioning

confidence: 99%

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Scale effects and full-scale ship hydrodynamics: A review

2022

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Section: Evidence To Support the Existence Of An Interaction Termmentioning

confidence: 99%

Section: Shallow and Confined Watersmentioning

confidence: 99%

Scale effects and full-scale ship hydrodynamics: A review

2022

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“…Sun et al (2020) conducted full-scale ship self-propulsion simulations and analysed the influence of the scale effect on the hull-propeller interaction. Kok et al (2020) used DTC container ships as their research object and numerically analysed the scale effect of the ship heave in shallow water. Their simulation results demonstrated that the heave of the ship is proportional to the scale ratio, and the scale effect can be ignored.…”

Section: Introductionmentioning

confidence: 99%

Simulation strategy of the full-scale ship resistance and propulsion performance

Guo

Sun

Wang

et al. 2021

Engineering Applications of Computational Fluid Mechanics

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The ship powering performance can be predicted based on model tests or simulations. However, differences exist between the full-scale ship performance and extrapolated model data. Therefore, research on full-scale ship performance simulation has important scientific significance and engineering value. This study used the REGAL general cargo vessel to perform full-scale ship resistance and self-propulsion simulations for various grid numbers, time step sizes, and wall Y+ values and compared the calculation and empirical results. The resistance components, waveform, Courant-Friedrichs Lewy (CFL) number, pressure field, and wake flow field of various resistance simulation conditions were analysed. The wall Y+ value was observed to affect the capture of boundary layer flow, ship pressure field evolution, and waveform, which subsequently affect the ship resistance. A Y+ value within 200 was considered to be appropriate when simulating the powering performance of a full-scale ship. The waveform evolution was significantly affected by the time step size, which should meet the requirement that the CFL number on the free surface is less than 1. When simulating the self-propulsion of a full-scale ship based on sliding mesh, the CFL number on the interface should also be less than 1. Additionally, to obtain the correct propeller excitation force, it was recommended that the time step size be maintained below 1°/step (0.000076 L PP /v).

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