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Abstract

Bluff bodies advancing through a free surface at high Froude numbers create intricate flow patterns worth further investigation. An example of such flows includes a submarine operating near the free surface which generally will have one or more masts piercing the free surface. These have the potential to produce large wakes at the surface. This article describes the numerical analysis used to investigate possible design modifications to reduce the wake profile of a singular cylindrical mast piercing the free surface. The large eddy simulation model carried out in OpenFOAM computational fluid dynamics software was validated against experimental data obtained by the authors using tow tank experiments. The modifications included the use of a double mast system based on the cylindrical mast and truncated NACA0012 sections. All configurations were performed with a mast cross-sectional area corresponding to a typical submarine snorkel across speeds ranging from two to eight knots. The plume size and mast drag were recorded, and the results show that a 30% reduction in wake profile can be obtained using a double mast system at speeds around eight knots, while at the lower speeds the benefit is not as significant.

Item Type:	Article
Authors/Creators:	Conway, AST and Ranmuthugala, D and Binns, JR and Renilson, M
Keywords:	LES, free surface, bluff body, plume profile
Journal or Publication Title:	Journal of Engineering for the Maritime Environment
Publisher:	Sage Publications Ltd
ISSN:	1475-0902
DOI / ID Number:	https://doi.org/10.1177/1475090217710085
Copyright Information:	Copyright 2017 IMechE
Related URLs:	Google Scholar: Binns, JR UTAS Profile: Binns, JR
Item Statistics:	View statistics for this item

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