Effect of the orientation of the harbor seal vibrissa based biomimetic cylinder on hydrodynamic forces and vortex induced frequency
The present study considered the geometric disturbance inspired by a harbor seal vibrissa of which undulated surface structures (HSV) are known as a detecting device to capture the water movement induced by prey fish. As an original research can extend to the flow control based on the biomimetic, th...
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craippubl:10.1063/1.5008658 2024-09-30T14:36:10+00:00 Effect of the orientation of the harbor seal vibrissa based biomimetic cylinder on hydrodynamic forces and vortex induced frequency Kim, HyoJu Yoon, Hyun Sik National Research Foundation of Korea 2017 http://dx.doi.org/10.1063/1.5008658 https://pubs.aip.org/aip/adv/article-pdf/doi/10.1063/1.5008658/12897641/105015_1_online.pdf en eng AIP Publishing AIP Advances volume 7, issue 10 ISSN 2158-3226 journal-article 2017 craippubl https://doi.org/10.1063/1.5008658 2024-09-12T04:05:40Z The present study considered the geometric disturbance inspired by a harbor seal vibrissa of which undulated surface structures (HSV) are known as a detecting device to capture the water movement induced by prey fish. As an original research can extend to the flow control based on the biomimetic, this study aims at finding the effect of the angle of attack (AOA) on flow characteristics around the harbor seal vibrissa shaped cylinder, to cover the change of flow direction during the harbor seal’s movements and surrounding conditions. Therefore, we considered a wide range of AOA varying from 0 to 90 degree. We carried out large eddy simulation (LES) to investigate the flow around inclined vibrissa shaped cylinder for the Reynolds number (Re) of 500. The elliptic cylinder is considered for the purpose of the comparison. The difference of force coefficients between the HSV and the elliptic cylinder can be classified into three regimes of one large variation region, two invariant regimes according to AOA. In contrast to the elliptic cylinder showing the monotonically decrease of the vortex shedding frequency in AOA, the HSV reveals the increasing and then decreasing behavior of the vortex shedding frequency along the AOA. The same decreasing profile of the vortex shedding frequency means that the HSV lost the unique function on the vortex shedding frequency. The shear layers for the HSV is much longer than that of shear layers for the elliptic cylinder at low angles of the attack. With increasing AOA, the difference of the vortical structures in the wake between the HSV and the elliptic cylinder becomes minor. Thus, it can be concluded that as AOA increases, the bluff body flow overcomes the flow induced by the HSV shape, resulting in the appearance of almost the same flow with the elliptic cylinder. Article in Journal/Newspaper harbor seal AIP Publishing The Bluff ENVELOPE(-61.567,-61.567,-64.367,-64.367) AIP Advances 7 10 105015 |
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English |
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The present study considered the geometric disturbance inspired by a harbor seal vibrissa of which undulated surface structures (HSV) are known as a detecting device to capture the water movement induced by prey fish. As an original research can extend to the flow control based on the biomimetic, this study aims at finding the effect of the angle of attack (AOA) on flow characteristics around the harbor seal vibrissa shaped cylinder, to cover the change of flow direction during the harbor seal’s movements and surrounding conditions. Therefore, we considered a wide range of AOA varying from 0 to 90 degree. We carried out large eddy simulation (LES) to investigate the flow around inclined vibrissa shaped cylinder for the Reynolds number (Re) of 500. The elliptic cylinder is considered for the purpose of the comparison. The difference of force coefficients between the HSV and the elliptic cylinder can be classified into three regimes of one large variation region, two invariant regimes according to AOA. In contrast to the elliptic cylinder showing the monotonically decrease of the vortex shedding frequency in AOA, the HSV reveals the increasing and then decreasing behavior of the vortex shedding frequency along the AOA. The same decreasing profile of the vortex shedding frequency means that the HSV lost the unique function on the vortex shedding frequency. The shear layers for the HSV is much longer than that of shear layers for the elliptic cylinder at low angles of the attack. With increasing AOA, the difference of the vortical structures in the wake between the HSV and the elliptic cylinder becomes minor. Thus, it can be concluded that as AOA increases, the bluff body flow overcomes the flow induced by the HSV shape, resulting in the appearance of almost the same flow with the elliptic cylinder. |
author2 |
National Research Foundation of Korea |
format |
Article in Journal/Newspaper |
author |
Kim, HyoJu Yoon, Hyun Sik |
spellingShingle |
Kim, HyoJu Yoon, Hyun Sik Effect of the orientation of the harbor seal vibrissa based biomimetic cylinder on hydrodynamic forces and vortex induced frequency |
author_facet |
Kim, HyoJu Yoon, Hyun Sik |
author_sort |
Kim, HyoJu |
title |
Effect of the orientation of the harbor seal vibrissa based biomimetic cylinder on hydrodynamic forces and vortex induced frequency |
title_short |
Effect of the orientation of the harbor seal vibrissa based biomimetic cylinder on hydrodynamic forces and vortex induced frequency |
title_full |
Effect of the orientation of the harbor seal vibrissa based biomimetic cylinder on hydrodynamic forces and vortex induced frequency |
title_fullStr |
Effect of the orientation of the harbor seal vibrissa based biomimetic cylinder on hydrodynamic forces and vortex induced frequency |
title_full_unstemmed |
Effect of the orientation of the harbor seal vibrissa based biomimetic cylinder on hydrodynamic forces and vortex induced frequency |
title_sort |
effect of the orientation of the harbor seal vibrissa based biomimetic cylinder on hydrodynamic forces and vortex induced frequency |
publisher |
AIP Publishing |
publishDate |
2017 |
url |
http://dx.doi.org/10.1063/1.5008658 https://pubs.aip.org/aip/adv/article-pdf/doi/10.1063/1.5008658/12897641/105015_1_online.pdf |
long_lat |
ENVELOPE(-61.567,-61.567,-64.367,-64.367) |
geographic |
The Bluff |
geographic_facet |
The Bluff |
genre |
harbor seal |
genre_facet |
harbor seal |
op_source |
AIP Advances volume 7, issue 10 ISSN 2158-3226 |
op_doi |
https://doi.org/10.1063/1.5008658 |
container_title |
AIP Advances |
container_volume |
7 |
container_issue |
10 |
container_start_page |
105015 |
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1811639302485966848 |