Numerical investigation on bubble size distribution around an underwater vehicle

Vahaji, S, Chen, L, Cheung, S and Tu, J 2018, 'Numerical investigation on bubble size distribution around an underwater vehicle', Applied Ocean Research, vol. 78, pp. 254-266.


Document type: Journal Article
Collection: Journal Articles

Title Numerical investigation on bubble size distribution around an underwater vehicle
Author(s) Vahaji, S
Chen, L
Cheung, S
Tu, J
Year 2018
Journal name Applied Ocean Research
Volume number 78
Start page 254
End page 266
Total pages 13
Publisher Elsevier
Abstract The interaction of bubbles with flow boundaries has been of high interest for marine engineering; for example, when a propeller is cavitating or air is entrained in the wake of a maneuvering ship, the strong interaction with the boundary layer will lead to the formation of a bubbly wake. To be able to develop the best mitigation strategy, a deep understanding of the associated physics is required. Only a few articles published in open literature address this two-phase fluid system. In the present study, a 3D numerical simulation has been performed to model a bubbly two-phase flow around the DARPA SUBOFF, in which exhaust gas is discharged into the flow around the object to provide a platform for investigating the distribution of the bubbles around a curved body. The two-phase flow is modelled using the Eulerian-Eulerian approach coupled with the MUSIG model. The bubble distribution is characterized based on different gas discharge configurations. It has been found that the boundary layer flow has a strong effect on bubble formation process, particularly encourages the bubble fragmentation. As a result, many small bubbles will be trapped at the aft of the vehicle.
Subject Numerical Modelling and Mechanical Characterisation
Keyword(s) Breakage
CFD
Coalescence
Gas-liquid flow
Population balance
Underwater vehicle
DOI - identifier 10.1016/j.apor.2018.06.013
Copyright notice Crown Copyright © 2018 Published by Elsevier Ltd. All rights reserved.
ISSN 0141-1187
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