Drag of suction cup tags on swimming animals : modeling and measurement
Shorter, K. Alex
Murray, Mark M.
Johnson, Mark P.
Moore, Michael J.
Howle, Laurens E.
MetadataShow full item record
Bio-logging tags are widely used to study the behavior and movements of marine mammals with the tacit assumption of little impact to the animal. However, tags on fast-swimming animals generate substantial hydrodynamic forces potentially affecting behavior and energetics adversely, or promoting early removal of the tag. In this work, hydrodynamic loading of three novel tag housing designs are compared over a range of swimming speeds using computational fluid dynamics (CFD). Results from CFD simulation were verified using tag models in a water flume with close agreement. Drag forces were reduced by minimizing geometric disruptions to the flow around the housing, while lift forces were reduced by minimizing the frontal cross-sectional area of the housing and holding the tag close to the attachment surface. Hydrodynamic tag design resulted in an experimentally measured 60% drag force reduction in 5.6 m/s flow. For all housing designs, off-axis flow increased the magnitude of the force on the tag. Experimental work with a common dolphin (Delphinus delphis) cadaver indicates that the suction cups used to attach the types of tags described here provide sufficient attachment force to resist failure to predicted forces at swimming speeds of up to 10 m/s.
© The Author(s), 2013. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Marine Mammal Science 30 (2014): 726–746, doi:10.1111/mms.12083.
Suggested CitationMarine Mammal Science 30 (2014): 726–746
The following license files are associated with this item:
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 Unported
Showing items related by title, author, creator and subject.
Gemmell, Brad J.; Fogerson, Stephanie M.; Costello, John H.; Morgan, Jennifer R.; Dabiri, John O.; Colin, Sean P. (Company of Biologists, 2016-12-14)Swimming animals commonly bend their bodies to generate thrust. For undulating animals such as eels and lampreys, their bodies bend in the form of waves that travel from head to tail. These kinematics accelerate the flow ...
Colin, Sean P.; Costello, John H.; Sutherland, Kelly R.; Gemmell, Brad J.; Dabiri, John O.; Du Clos, Kevin T. (Nature Research, 2020-10-20)An abundance of swimming animals have converged upon a common swimming strategy using multiple propulsors coordinated as metachronal waves. The shared kinematics suggest that even morphologically and systematically diverse ...
Gemmell, Brad J.; Colin, Sean P.; Costello, John H.; Dabiri, John O. (Nature Publishing Group, 2015-11-03)A central and long-standing tenet in the conceptualization of animal swimming is the idea that propulsive thrust is generated by pushing the surrounding water rearward. Inherent in this perspective is the assumption that ...