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137476 - Multiple approaches to numerical modelling of container ship squat in confined water - aam.pdf (1.08 MB)

Multiple approaches to numerical modelling of container ship squat in confined water

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journal contribution
posted on 2023-05-20, 10:59 authored by Zhen Kok, Jonathan DuffyJonathan Duffy, Shuhong ChaiShuhong Chai, Jin, Y
Various URANS modelling techniques to predict container ship squat in confined water are investigated and compared in this study to assess the suitability of each modelling technique. Five methods are compared, among which three are quasi-statical estimations of squat from CFD computed hydrodynamic forces and moment (QS), and two are based on directly computed squat utilising dynamic overset meshing (OV) technique. In addition, the effect of self-propulsion on squat is investigated by comparing different methods of propulsion i.e. the hull is either towed (T) or self-propelled by means of body-force propulsion virtual disc model (VD) or a fully discretised propeller (DP). The investigation shows that the QS methods tend to be superior in terms of computation efficiency, range of applicability and trim prediction accuracy. It is also shown that the effect of self-propulsion is significant and should be accounted for to provide accurate results, especially at relatively high speeds. Moreover, virtual disc modelling is more computationally economical while also providing similar degree of accuracy to that of a discretised propeller. Thus, the most suitable method is the quasi-static method with virtual disc self-propulsion (QS-VD). However, for very shallow cases where h/T < 1.14, the towed quasi-static squat model (QS-T) is recommended due to better accuracy.

History

Publication title

Journal of Waterway, Port, Coastal, and Ocean Engineering

Volume

146

Issue

4

Article number

4020017

Number

4020017

Pagination

1-11

ISSN

0733-950X

Department/School

Australian Maritime College

Publisher

Asce-Amer Soc Civil Engineers

Place of publication

1801 Alexander Bell Dr, Reston, USA, Va, 20191-4400

Rights statement

Copyright 2020 American Society of Civil Engineers

Repository Status

  • Open

Socio-economic Objectives

Water safety; Water transport not elsewhere classified

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