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Predicting surface wakes using LES and RANS-SST analysis

Citation

Conway, A and Ranmuthugala, SD and Binns, JR, Predicting surface wakes using LES and RANS-SST analysis, Proceedings of the 2nd Submarine Science, Technology, and Engineering Conference 2013, 15-17 October 2013, Adelaide, South Australia, pp. 337-342. ISBN 978-0-646-91147-2 (2013) [Refereed Conference Paper]


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Copyright 2013 the Authors

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Abstract

Conventional submarines are required to approach and pierce the surface with vertically mounted appendages such as a periscope or a snorkelling mast. These appendages are typically bluff bodies which can generate a significant wake profile which is susceptible to detection either by radar, sound, or visual sighting. Therefore, more details about the wake profile are required to understand the aspects of it which can be detected and identify any operational and design methods to reduce the risk of detection. This project includes the investigation into the capability of the Large Eddy Simulation (LES) and RANS-SST models within OpenFOAM to accurately replicate such operations. Thus, simulations using LES and RANS-SST were carried out to model the wake profile and fountain height generated by a cylinder under flow rates between 2 to 8 knots, ranging from subcritical to supercritical flow regimes (Re=2.7104 to Re=4105). The results were validated against published experimental and numerical data comparing the fountain height, free-surface contours, and variation in velocity signals in the wake. This study has shown the possibility to use LES to model and examine the wake generated by a cylinder allowing further study to be conducted in methods of reducing the risk of detection.

Item Details

Item Type:Refereed Conference Paper
Keywords:LES, RANS-SST, free surface piercing cylinder
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Ship and Platform Hydrodynamics
Objective Division:Defence
Objective Group:Defence
Objective Field:Navy
Author:Conway, A (Mr Alexander Conway)
Author:Ranmuthugala, SD (Professor Dev Ranmuthugala)
Author:Binns, JR (Associate Professor Jonathan Binns)
ID Code:86912
Year Published:2013
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2013-10-31
Last Modified:2016-01-08
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