A 3D study of the bubble sweep-down phenomenon around a 1/30 scale ship model

Type Article
Date 2018-11
Language English
Author(s) Mallat Bachar1, Germain GregoryORCID1, Billard Jean-Yves2, Gaurier BenoitORCID1
Affiliation(s) 1 : IFREMER, Marine Struct Lab, 150 Quai Gambetta, F-62200 Boulogne Sur Mer, France.
2 : IRENAV Ecole Navale, CC 600 Lanveoc, F-29240 Brest 9, France.
Source European Journal Of Mechanics B-fluids (0997-7546) (Elsevier Science Bv), 2018-11 , Vol. 72 , P. 471-484
DOI 10.1016/j.euromechflu.2018.07.014
Keyword(s) Bubble sweep-down, Breaking wave, Bow wave, Fluid-structure interaction, Flume tank
Abstract

The bubble sweep-down phenomenon around oceanographic research vessels generates acoustic disturbances. A specific experimental protocol in a wave and current circulating tank is used to study this phenomenon around a 1/30 scale ship model in a configuration with current, waves and ship motions. 3D visualizations of the bubble clouds and Stereo-PIV (Particle Image Velocimetry) measurements results, both obtained in the bow vicinity of the ship model, are presented in this paper. The behaviour of the breaking wave with bubble generation is studied and the spatial evolution of the bubble clouds is investigated. It is demonstrated that the bubble cloud generation is mainly conditioned by the ascending vertical velocity of the flow near the bow. It is observed that the bubble clouds are propagated in the flow direction with a horizontal expansion which is non negligeable, reaching a close position to the hull. The overall results provide new elements for the study and the understanding of the phenomenon compared with previous 2D studies.

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