eCite Digital Repository

Comparison of unsteady Reynolds-averaged Navier-Stokes prediction of self-propelled container ship squat against empirical methods and benchmark data

Citation

Kok, Z and Duffy, JT and Chai, S and Jin, Y, Comparison of unsteady Reynolds-averaged Navier-Stokes prediction of self-propelled container ship squat against empirical methods and benchmark data, Transactions of the Royal Institution of Naval Architects, Part A: International Journal of Maritime Engineering, 162, (Part A2) pp. 193-206. ISSN 1479-8751 (2020) [Refereed Article]

Copyright Statement

© RINA 2020

Official URL: https://www.rina.org.uk/ijme_digital.html

DOI: doi:10.3940/rina.ijme.2020.a2.604

Abstract

The demand to increase port throughput has driven container ships to travel relatively fast in shallow water whilst avoiding grounding and hence, there is need for more accurate high speed squat predictions. A study has been undertaken to determine the most suitable method to predict container ship squat when travelling at relatively high speeds (Frh ≥ 0.5) in finite water depth (1.1 ≤ h/T ≤ 1.3). The accuracy of two novel self-propelled URANS CFD squat model are compared with that of readily available empirical squat prediction formulae. Comparison of the CFD and empirical predictions with benchmark data demonstrates that for very low water depth (h/T < 1.14) and when Frh < 0.46; Barass II (1979), ICORELS (1980), and Millward’s (1992) formulae have the best correlation with benchmark data for all cases investigated. However, at relatively high speeds (Frh ≥ 0.5) which is achievable in deeper waters (h/T ≥ 1.14), most of the empirical formulae severely underestimated squat (7-49%) whereas the quasi-static CFD model presented has the best correlation. The changes in wave patterns and effective wake fraction with respect to h/T are also presented.

Item Details

Item Type:Refereed Article
Keywords:ship squat, self-propulsion, fully-discretised propeller, confined water, wake
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 (Mr Zhen Kok)
UTAS Author:Duffy, JT (Dr Jonathan Duffy)
UTAS Author:Chai, S (Professor Shuhong Chai)
ID Code:139918
Year Published:2020
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2020-07-15
Last Modified:2020-10-13
Downloads:0

Repository Staff Only: item control page