Data from: From the track to the ocean: using flow control to improve marine bio-logging tags for cetaceans
Fiore, Giovani, University of Illinois System
Anderson, Erik, Grove City College
Garborg, C. Spencer, Grove City College
Murray, Mark, United States Naval Academy
Johnson, Mark, University of St Andrews
Moore, Michael J., Woods Hole Oceanographic Institution
Howle, Laurens, Duke University
Shorter, K. Alex, University of Michigan-Ann Arbor
Published Mar 15, 2017 on Dryad.
Cite this dataset
Fiore, Giovani et al. (2017). Data from: From the track to the ocean: using flow control to improve marine bio-logging tags for cetaceans [Dataset]. Dryad. https://doi.org/10.5061/dryad.4j4m1
Bio-logging tags are an important tool for the study of cetaceans, but superficial tags inevitably increase hydrodynamic loading. Substantial forces can be generated by tags on fast-swimming animals, potentially affecting behavior and energetics or promoting early tag removal. Streamlined forms have been used to reduce loading, but these designs can accelerate flow over the top of the tag. This non-axisymmetric flow results in large lift forces (normal to the animal) that become the dominant force component at high speeds. In order to reduce lift and minimize total hydrodynamic loading this work presents a new tag design (Model A) that incorporates a hydrodynamic body, a channel to reduce fluid speed differences above and below the housing and wing to redirect flow to counter lift. Additionally, three derivatives of the Model A design were used to examine the contribution of individual flow control features to overall performance. Hydrodynamic loadings of four models were compared using computational fluid dynamics (CFD). The Model A design eliminated all lift force and generated up to ~30 N of downward force in simulated 6 m/s aligned flow. The simulations were validated using particle image velocimetry (PIV) to experimentally characterize the flow around the tag design. The results of these experiments confirm the trends predicted by the simulations and demonstrate the potential benefit of flow control elements for the reduction of tag induced forces on the animal.
CFD Summary Results
Simulation results for Model A tag housing design and the design derivatives over a range of flow velocities (V∞ = 1-6 m/s) are included in the supplemental data file. Additionally, data from forces generated by the Model A design in constant 5.6 m/s offaxis flow (β = 0º–180º) are also provided.
CFD and PIV Data
These supplemental files included the experimental measurements and simulation data used to generate the normalized fluid pressure around the Model A design. These data were used to create the difference map between the coefficients of pressure (Cpdiff) that was used to compare experimental and simulation results. The units for the velocity fields are (m/s).
National Science Foundation, Award: National Science Foundation via the Office of Naval Research N00014-11-1-0113