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Wake Induced By Real Seal Whiskers: Particle Imaging Velocimetry Analysis

Turk, Jodi
http://orcid.org/0000-0003-3288-1757
http://rave.ohiolink.edu/etdc/view?acc_num=csu1529335121279739

Abstract Details

2018, Master of Science in Mechanical Engineering, Cleveland State University, Washkewicz College of Engineering.
Certain species of seals are able to faithfully detect minute disturbances in ambient water solely using their whiskers, which is attributed to the whiskers’ undulating three-dimensional (3D) morphology, that can change vortex induced vibrations (VIVs). Previous studies have examined effects of key morphology parameters on the wake using scaled-up whisker models but it is unclear how the vortex shedding and VIVs are induced by a real undulating seal whisker. Real seal whiskers usually have a diameter of about one millimeter and present variation in size and bending curvature along the length, which are not considered in designing scaled-up whisker-like models. In addition, how the whisker orientation affects the induced wake and vortex shedding needs to be clarifed. The first part of this study examines the wake flow characteristics generated by a real elephant seal whisker (of undulating morphology) and a California sea lion whisker (of smooth morphology) in laboratory water channels at Reynolds numbers of 390 and 470, using time-resolved particle image velocimetry (PIV). Results indicate that the vortex shedding frequency is reduced for both the undulating and smooth whiskers, the energy spectral density is substantially increased when the minor axis of the whisker is parallel with the incoming flow (i.e., the angle of attack (AOA) = 90 degrees) in comparison to the major axis of the whisker being parallel with the incoming flow (i.e., AOA = 0 degrees). Regardless of AOA, the energy spectral density is approximately 40% lower in the wake of the undulating whisker than that of the smooth whisker, indicating the favorable hydrodynamic feature of the undulating whisker. The second part of this study is to understand the wake of multiple elephant seal whiskers of in-line configurations at the Reynolds number of 100, conducted in a laboratory water channel and analyzed using snap-shot PIV (or low-repetition PIV). Results indicate that the reversed flow region is remarkably reduced and turbulence intensities are greatly suppressed behind the second undulating whisker compared to that of the first undulating whisker, when the AOA is 0 degrees. The extraordinary hydrodynamic traits of undulating seal whiskers are promising for renovating aero-propulsion flow components.
Wei Zhang (Advisor)
Asuquo Ebiana (Committee Member)
Thijs Heus (Committee Member)
Vikram Shyam (Committee Member)
73 p.
Fluid Dynamics; Mechanical Engineering

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Citations

  • Turk, J. (2018). Wake Induced By Real Seal Whiskers: Particle Imaging Velocimetry Analysis [Master's thesis, Cleveland State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=csu1529335121279739

    APA Style (7th edition)

  • Turk, Jodi. Wake Induced By Real Seal Whiskers: Particle Imaging Velocimetry Analysis. 2018. Cleveland State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=csu1529335121279739.

    MLA Style (8th edition)

  • Turk, Jodi. "Wake Induced By Real Seal Whiskers: Particle Imaging Velocimetry Analysis." Master's thesis, Cleveland State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=csu1529335121279739

    Chicago Manual of Style (17th edition)

csu1529335121279739
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This open access ETD is published by Cleveland State University and OhioLINK.