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Annular and spiral bubble nets: A simulation-focused analysis of humpback whale feeding strategies

Bryngelson, Spencer H. and Colonius, Tim (2019) Annular and spiral bubble nets: A simulation-focused analysis of humpback whale feeding strategies. Journal of the Acoustical Society of America, 146 (4). p. 2771. ISSN 0001-4966. https://resolver.caltech.edu/CaltechAUTHORS:20191119-101701319

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Abstract

Humpback whales can generate bubbly regions (called bubble nets) via their blowholes, which they appear to exploit via loud vocalizations for feeding purposes. We model this phenomenon as the acoustic excitation of an dilute bubble net of radially varying void fraction. A fully coupled phase-averaging approach is used to compute the bubble response and corresponding acoustics. We first assess the possibility of a sophisticated wave-guidance behavior of high-frequency whale vocalizations within the bubble net. For a small range of flow parameters, the reflections associated with the bubbly region result in an observable wave-guidance behavior, though even then these reflections disperse rapidly. In light of this, we also consider multiple whales surrounding the bubble net, each vocalizing towards its center. We show that for physically realistic configurations, including variations in the bubble net void fraction and number of whales, the bubble net can keep its core region substantially quieter than the exterior. Finally, we investigate the ability of spiral, rather than annular, geometries for keeping the bubble-free region quiet.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1121/1.5136599DOIArticle
ORCID:
AuthorORCID
Bryngelson, Spencer H.0000-0003-1750-7265
Colonius, Tim0000-0003-0326-3909
Additional Information:© 2019 Acoustical Society of America. Published Online: 13 November 2019.
Issue or Number:4
Record Number:CaltechAUTHORS:20191119-101701319
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20191119-101701319
Official Citation:Annular and spiral bubble nets: A simulation-focused analysis of humpback whale feeding strategies. Spencer H. Bryngelson; Tim Colonius. The Journal of the Acoustical Society of America 146:4, 2771-2771. https://doi.org/10.1121/1.5136599
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99928
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Nov 2019 19:14
Last Modified:19 Nov 2019 19:14

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