Wake Induced by an Undulating Elephant Seal Whisker
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. While previous studies have examined effects of key morphology parameters on the wake using scal...
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ftclevelandstate:oai:engagedscholarship.csuohio.edu:enme_facpub-1334 2023-05-15T16:05:16+02:00 Wake Induced by an Undulating Elephant Seal Whisker Bunjevac, Joseph Turk, Jodi Rinehart, Aidan Zhang, Wei 2018-08-01T07:00:00Z https://engagedscholarship.csuohio.edu/enme_facpub/331 https://link.springer.com/article/10.1007/s12650-018-0484-4 unknown EngagedScholarship@CSU https://engagedscholarship.csuohio.edu/enme_facpub/331 https://link.springer.com/article/10.1007/s12650-018-0484-4 Mechanical Engineering Faculty Publications Seal whisker Vortex shedding Vortex-induced vibration (VIV) Biomimicry Whisker-inspired applications Mechanical Engineering text 2018 ftclevelandstate 2022-05-23T14:13:22Z 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. While previous studies have examined effects of key morphology parameters on the wake using scaled-up whisker models, it is unclear how the wake behaves when 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 being considered in designing scaled-up whisker-like models. In addition, how the whisker orientation affects the induced wake and vortex shedding needs to be clarified. This work 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 110 and 390, using snapshot particle image velocimetry (PIV) and time-resolved PIV methods. Results indicate that the reversed flow region is remarkably reduced and turbulence intensities are greatly suppressed behind the undulating whisker compared to that of the smooth whisker, when the major axis of the whisker cross-section is parallel with the incoming flow (i.e., the angle of attack or AOA is 0∘" role="presentation">∘). While the vortex shedding frequency is reduced for both the undulating and smooth whiskers, the power spectral density is substantially increased at an AOA=90∘" role="presentation">AOA=90∘ in comparison to AOA=0∘" role="presentation">AOA=0∘. Regardless of the AOA, the power 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 extraordinary hydrodynamic traits of undulating seal whiskers is promising for renovating aero-propulsion flow components and designing high-sensitivity underwater flow sensors. Text Elephant Seal Cleveland State University: EngagedScholarship@CSU |
institution |
Open Polar |
collection |
Cleveland State University: EngagedScholarship@CSU |
op_collection_id |
ftclevelandstate |
language |
unknown |
topic |
Seal whisker Vortex shedding Vortex-induced vibration (VIV) Biomimicry Whisker-inspired applications Mechanical Engineering |
spellingShingle |
Seal whisker Vortex shedding Vortex-induced vibration (VIV) Biomimicry Whisker-inspired applications Mechanical Engineering Bunjevac, Joseph Turk, Jodi Rinehart, Aidan Zhang, Wei Wake Induced by an Undulating Elephant Seal Whisker |
topic_facet |
Seal whisker Vortex shedding Vortex-induced vibration (VIV) Biomimicry Whisker-inspired applications Mechanical Engineering |
description |
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. While previous studies have examined effects of key morphology parameters on the wake using scaled-up whisker models, it is unclear how the wake behaves when 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 being considered in designing scaled-up whisker-like models. In addition, how the whisker orientation affects the induced wake and vortex shedding needs to be clarified. This work 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 110 and 390, using snapshot particle image velocimetry (PIV) and time-resolved PIV methods. Results indicate that the reversed flow region is remarkably reduced and turbulence intensities are greatly suppressed behind the undulating whisker compared to that of the smooth whisker, when the major axis of the whisker cross-section is parallel with the incoming flow (i.e., the angle of attack or AOA is 0∘" role="presentation">∘). While the vortex shedding frequency is reduced for both the undulating and smooth whiskers, the power spectral density is substantially increased at an AOA=90∘" role="presentation">AOA=90∘ in comparison to AOA=0∘" role="presentation">AOA=0∘. Regardless of the AOA, the power 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 extraordinary hydrodynamic traits of undulating seal whiskers is promising for renovating aero-propulsion flow components and designing high-sensitivity underwater flow sensors. |
format |
Text |
author |
Bunjevac, Joseph Turk, Jodi Rinehart, Aidan Zhang, Wei |
author_facet |
Bunjevac, Joseph Turk, Jodi Rinehart, Aidan Zhang, Wei |
author_sort |
Bunjevac, Joseph |
title |
Wake Induced by an Undulating Elephant Seal Whisker |
title_short |
Wake Induced by an Undulating Elephant Seal Whisker |
title_full |
Wake Induced by an Undulating Elephant Seal Whisker |
title_fullStr |
Wake Induced by an Undulating Elephant Seal Whisker |
title_full_unstemmed |
Wake Induced by an Undulating Elephant Seal Whisker |
title_sort |
wake induced by an undulating elephant seal whisker |
publisher |
EngagedScholarship@CSU |
publishDate |
2018 |
url |
https://engagedscholarship.csuohio.edu/enme_facpub/331 https://link.springer.com/article/10.1007/s12650-018-0484-4 |
genre |
Elephant Seal |
genre_facet |
Elephant Seal |
op_source |
Mechanical Engineering Faculty Publications |
op_relation |
https://engagedscholarship.csuohio.edu/enme_facpub/331 https://link.springer.com/article/10.1007/s12650-018-0484-4 |
_version_ |
1766401167554772992 |