Volumetric imaging of shark tail hydrodynamics reveals a three-dimensional dual-ring vortex wake structure

Brooke Flammang-Lockyer, George V. Lauder, Daniel R. Troolin, Tyson Strand

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

Understanding how moving organisms generate locomotor forces is fundamental to the analysis of aerodynamic and hydrodynamic flow patterns that are generated during body and appendage oscillation. In the past, this has been accomplished using two-dimensional planar techniques that require reconstruction of three-dimensional flow patterns. We have applied a new, fully three-dimensional, volumetric imaging technique that allows instantaneous capture of wake flow patterns, to a classic problem in functional vertebrate biology: the function of the asymmetrical (heterocercal) tail of swimming sharks to capture the vorticity field within the volume swept by the tail. These data were used to test a previous three-dimensional reconstruction of the shark vortex wake estimated from two-dimensional flow analyses, and show that the volumetric approach reveals a different vortex wake not previously reconstructed from two-dimensional slices. The hydrodynamic wake consists of one set of dual-linked vortex rings produced per half tail beat. In addition, we use a simple passive shark-tail model under robotic control to show that the three-dimensional wake flows of the robotic tail differ from the active tail motion of a live shark, suggesting that active control of kinematics and tail stiffness plays a substantial role in the production of wake vortical patterns.

Original languageEnglish (US)
Pages (from-to)3670-3678
Number of pages9
JournalProceedings of the Royal Society B: Biological Sciences
Volume278
Issue number1725
DOIs
StatePublished - Jan 1 2011

Fingerprint

Sharks
Hydrodynamics
shark
sharks
hydrodynamics
vortex
Tail
Vortex flow
tail
image analysis
Imaging techniques
flow pattern
Flow patterns
robotics
Robotics
active control
two-dimensional flow
three-dimensional flow
Vorticity
Three-Dimensional Imaging

All Science Journal Classification (ASJC) codes

  • Agricultural and Biological Sciences(all)
  • Environmental Science(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)

Keywords

  • Locomotion
  • Shark
  • Swimming
  • Tail
  • Vortex

Cite this

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Volumetric imaging of shark tail hydrodynamics reveals a three-dimensional dual-ring vortex wake structure. / Flammang-Lockyer, Brooke; Lauder, George V.; Troolin, Daniel R.; Strand, Tyson.

In: Proceedings of the Royal Society B: Biological Sciences, Vol. 278, No. 1725, 01.01.2011, p. 3670-3678.

Research output: Contribution to journalArticle

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