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


Kok, Z and Duffy, J and Chai, S and Jin, Y and Javanmardi, M, Numerical investigation of scale effect in self-propelled container ship squat, Applied Ocean Research, 99 Article 102143. ISSN 0141-1187 (2020) [Refereed Article]

Copyright Statement

2020 Elsevier Ltd. All rights reserved.

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DOI: doi:10.1016/j.apor.2020.102143


A URANS CFD-based study has been undertaken to investigate scale effect in container ship squat. Initially, CFD studies were carried out for the model scale benchmarking squat cases of a self-propelled DTC container ship. Propulsion of the vessel was modelled by the body-force actuator disc method. Full scale investigations were then undertaken. Validation of the full scale set-up was demonstrated by computing the full scale bare hull resistance in deep, laterally unrestricted water and comparing against the extrapolated resistance of model scale benchmark resistance data. Upon validating the setup, it was used to predict full scale ship squat in confined waters. The credibility of the full scale confined water model was checked by comparing vessel resistance in confined water against the Landweber (1933) empirical prediction. To quantify scale effect in ship squat predicitons, the benchmarking squat cases were computed by adopting the validated full scale CFD model with body-force propulsion. Comparison between the full scale CFD, model scale CFD and model scale benchmark EFD squat results demonstrates that scale effect is negligible. In addition, model scale predicted ship squat results were compared with physical full scale squat measurements of similar hulls. The two series of results are in good agreement which also demonstrate that the scale effect is insignificant.

Item Details

Item Type:Refereed Article
Keywords:ship squat, Reynolds Averaged Navier-Stokes equation, scale effect, body-force propulsion, resistance extrapolation, confined water
Research Division:Engineering
Research Group:Maritime engineering
Research Field:Ship and platform structures (incl. maritime hydrodynamics)
Objective Division:Transport
Objective Group:Water transport
Objective Field:Water safety
UTAS Author:Kok, Z (Dr Zhen Kok)
UTAS Author:Duffy, J (Associate Professor Jonathan Duffy)
UTAS Author:Chai, S (Professor Shuhong Chai)
ID Code:138535
Year Published:2020
Web of Science® Times Cited:7
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2020-04-14
Last Modified:2020-07-22

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