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...
Published in: | AIP Advances |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
AIP Publishing LLC
2017
|
Subjects: | |
Online Access: | https://doi.org/10.1063/1.5008658 https://doaj.org/article/ee51c5e78c2a4f559a7cb32e6cfe2fd1 |
id |
ftdoajarticles:oai:doaj.org/article:ee51c5e78c2a4f559a7cb32e6cfe2fd1 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:ee51c5e78c2a4f559a7cb32e6cfe2fd1 2023-05-15T16:33:05+02:00 Effect of the orientation of the harbor seal vibrissa based biomimetic cylinder on hydrodynamic forces and vortex induced frequency HyoJu Kim Hyun Sik Yoon 2017-10-01T00:00:00Z https://doi.org/10.1063/1.5008658 https://doaj.org/article/ee51c5e78c2a4f559a7cb32e6cfe2fd1 EN eng AIP Publishing LLC http://dx.doi.org/10.1063/1.5008658 https://doaj.org/toc/2158-3226 2158-3226 doi:10.1063/1.5008658 https://doaj.org/article/ee51c5e78c2a4f559a7cb32e6cfe2fd1 AIP Advances, Vol 7, Iss 10, Pp 105015-105015-21 (2017) Physics QC1-999 article 2017 ftdoajarticles https://doi.org/10.1063/1.5008658 2022-12-31T15:33:52Z 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 Directory of Open Access Journals: DOAJ Articles The Bluff ENVELOPE(-61.567,-61.567,-64.367,-64.367) AIP Advances 7 10 105015 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 |
spellingShingle |
Physics QC1-999 HyoJu Kim Hyun Sik Yoon Effect of the orientation of the harbor seal vibrissa based biomimetic cylinder on hydrodynamic forces and vortex induced frequency |
topic_facet |
Physics QC1-999 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
HyoJu Kim Hyun Sik Yoon |
author_facet |
HyoJu Kim Hyun Sik Yoon |
author_sort |
HyoJu Kim |
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 LLC |
publishDate |
2017 |
url |
https://doi.org/10.1063/1.5008658 https://doaj.org/article/ee51c5e78c2a4f559a7cb32e6cfe2fd1 |
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, Vol 7, Iss 10, Pp 105015-105015-21 (2017) |
op_relation |
http://dx.doi.org/10.1063/1.5008658 https://doaj.org/toc/2158-3226 2158-3226 doi:10.1063/1.5008658 https://doaj.org/article/ee51c5e78c2a4f559a7cb32e6cfe2fd1 |
op_doi |
https://doi.org/10.1063/1.5008658 |
container_title |
AIP Advances |
container_volume |
7 |
container_issue |
10 |
container_start_page |
105015 |
_version_ |
1766022801433559040 |