Single degree of freedom vortex induced vibration of undulatory seal whiskers at low Reynolds number and various angles of attack: A computational fluid dynamics study
The cross-flow vortex-induced vibration (VIV) response of an elastically mounted idealized undulatory seal whisker (USW) shape is investigated in a wide range of reduced velocity at angles of attack (AOAs) from 0° to 90° and a low Reynolds number of 300. The mass ratio is set to 1.0 to represent the...
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Veröffentlicht in: | Physics of fluids (1994) 2024-09, Vol.36 (9) |
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description | The cross-flow vortex-induced vibration (VIV) response of an elastically mounted idealized undulatory seal whisker (USW) shape is investigated in a wide range of reduced velocity at angles of attack (AOAs) from 0° to 90° and a low Reynolds number of 300. The mass ratio is set to 1.0 to represent the real seal whisker. Dynamic mode decomposition is used to investigate the vortex shedding mode in various cases. In agreement with past studies, the VIV response of the USW is highly AOA-dependent because of the change in the underlying vortex dynamics. At zero AOA, the undulatory shape leads to a hairpin vortex mode that results in extremely low lift force oscillation with a lowered frequency. The frequency remains unaffected by VIV throughout the tested range of reduced velocity. As the AOA deviates from zero, alternating shedding of spanwise vortices becomes dominant. A mixed vortex shedding mode is observed at AOA = 15° in the transition. As the AOA deviated from zero, the VIV amplitude increases rapidly by two orders, reaching the maximum of about 3 times diameter at 90°. An infinite lock-in branch is present for AOA from 60° to 90°, where the VIV amplitude remains high regardless of the increase in reduced velocity. |
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The mass ratio is set to 1.0 to represent the real seal whisker. Dynamic mode decomposition is used to investigate the vortex shedding mode in various cases. In agreement with past studies, the VIV response of the USW is highly AOA-dependent because of the change in the underlying vortex dynamics. At zero AOA, the undulatory shape leads to a hairpin vortex mode that results in extremely low lift force oscillation with a lowered frequency. The frequency remains unaffected by VIV throughout the tested range of reduced velocity. As the AOA deviates from zero, alternating shedding of spanwise vortices becomes dominant. A mixed vortex shedding mode is observed at AOA = 15° in the transition. As the AOA deviated from zero, the VIV amplitude increases rapidly by two orders, reaching the maximum of about 3 times diameter at 90°. An infinite lock-in branch is present for AOA from 60° to 90°, where the VIV amplitude remains high regardless of the increase in reduced velocity.</description><identifier>ISSN: 1070-6631</identifier><identifier>EISSN: 1089-7666</identifier><identifier>DOI: 10.1063/5.0227544</identifier><identifier>CODEN: PHFLE6</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Amplitudes ; Angle of attack ; Computational fluid dynamics ; Cross flow ; Extreme values ; Fluid flow ; Horseshoe vortices ; Reynolds number ; Vortex shedding ; Vortex-induced vibrations ; Vortices</subject><ispartof>Physics of fluids (1994), 2024-09, Vol.36 (9)</ispartof><rights>Author(s)</rights><rights>2024 Author(s). 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The mass ratio is set to 1.0 to represent the real seal whisker. Dynamic mode decomposition is used to investigate the vortex shedding mode in various cases. In agreement with past studies, the VIV response of the USW is highly AOA-dependent because of the change in the underlying vortex dynamics. At zero AOA, the undulatory shape leads to a hairpin vortex mode that results in extremely low lift force oscillation with a lowered frequency. The frequency remains unaffected by VIV throughout the tested range of reduced velocity. As the AOA deviates from zero, alternating shedding of spanwise vortices becomes dominant. A mixed vortex shedding mode is observed at AOA = 15° in the transition. As the AOA deviated from zero, the VIV amplitude increases rapidly by two orders, reaching the maximum of about 3 times diameter at 90°. An infinite lock-in branch is present for AOA from 60° to 90°, where the VIV amplitude remains high regardless of the increase in reduced velocity.</description><subject>Amplitudes</subject><subject>Angle of attack</subject><subject>Computational fluid dynamics</subject><subject>Cross flow</subject><subject>Extreme values</subject><subject>Fluid flow</subject><subject>Horseshoe vortices</subject><subject>Reynolds number</subject><subject>Vortex shedding</subject><subject>Vortex-induced vibrations</subject><subject>Vortices</subject><issn>1070-6631</issn><issn>1089-7666</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><recordid>eNp9kctq3TAQhk1oILcu-gYDXTXgE90s29mF0KSBQKFJ10aWxqdKbOtUl6R-or5m5Zysu5ph-Phmhr8oPlGyoUTyi2pDGKsrIQ6KY0qatqyllB_WviallJweFSchPBFCeMvkcfH3wc7bEcHg1iOCG2DI1bgJXpyP-AfsbJJGAy-29ypaN69MysNRRecXCKhGeP1lwzP6ACrC6F7hBy6zG02AOU09elBzFihvXcrIui-sFhWj0s-XcAXaTbsU3_TZNozJGjDLrCarA4SYzHJWHA5qDPjxvZ4WP2--Pl5_K--_395dX92XmjYslhKxxYrRRpB66IWqGYqeD6Rlbd9QSbRpBkX6pqmZllxwRVlLBRGSN21F-pqfFp_33p13vxOG2D255PNVoeOUZEZWVGTqy57S3oXgceh23k7KLx0l3ZpDV3XvOWT2fM8Gbfcv_gf-Bx_aigg</recordid><startdate>202409</startdate><enddate>202409</enddate><creator>Geng, Biao</creator><creator>Zheng, Xudong</creator><creator>Xue, Qian</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0001-5403-8862</orcidid><orcidid>https://orcid.org/0000-0002-8462-1271</orcidid><orcidid>https://orcid.org/0000-0001-9729-9667</orcidid></search><sort><creationdate>202409</creationdate><title>Single degree of freedom vortex induced vibration of undulatory seal whiskers at low Reynolds number and various angles of attack: A computational fluid dynamics study</title><author>Geng, Biao ; Zheng, Xudong ; Xue, Qian</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c182t-6ee9e5218407fb4a72e4b3f0929b8160cd8fa0b8872c6343a1291404638950b73</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2024</creationdate><topic>Amplitudes</topic><topic>Angle of attack</topic><topic>Computational fluid dynamics</topic><topic>Cross flow</topic><topic>Extreme values</topic><topic>Fluid flow</topic><topic>Horseshoe vortices</topic><topic>Reynolds number</topic><topic>Vortex shedding</topic><topic>Vortex-induced vibrations</topic><topic>Vortices</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Geng, Biao</creatorcontrib><creatorcontrib>Zheng, Xudong</creatorcontrib><creatorcontrib>Xue, Qian</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Physics of fluids (1994)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Geng, Biao</au><au>Zheng, Xudong</au><au>Xue, Qian</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Single degree of freedom vortex induced vibration of undulatory seal whiskers at low Reynolds number and various angles of attack: A computational fluid dynamics study</atitle><jtitle>Physics of fluids (1994)</jtitle><date>2024-09</date><risdate>2024</risdate><volume>36</volume><issue>9</issue><issn>1070-6631</issn><eissn>1089-7666</eissn><coden>PHFLE6</coden><abstract>The cross-flow vortex-induced vibration (VIV) response of an elastically mounted idealized undulatory seal whisker (USW) shape is investigated in a wide range of reduced velocity at angles of attack (AOAs) from 0° to 90° and a low Reynolds number of 300. The mass ratio is set to 1.0 to represent the real seal whisker. Dynamic mode decomposition is used to investigate the vortex shedding mode in various cases. In agreement with past studies, the VIV response of the USW is highly AOA-dependent because of the change in the underlying vortex dynamics. At zero AOA, the undulatory shape leads to a hairpin vortex mode that results in extremely low lift force oscillation with a lowered frequency. The frequency remains unaffected by VIV throughout the tested range of reduced velocity. As the AOA deviates from zero, alternating shedding of spanwise vortices becomes dominant. A mixed vortex shedding mode is observed at AOA = 15° in the transition. As the AOA deviated from zero, the VIV amplitude increases rapidly by two orders, reaching the maximum of about 3 times diameter at 90°. An infinite lock-in branch is present for AOA from 60° to 90°, where the VIV amplitude remains high regardless of the increase in reduced velocity.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/5.0227544</doi><tpages>19</tpages><orcidid>https://orcid.org/0000-0001-5403-8862</orcidid><orcidid>https://orcid.org/0000-0002-8462-1271</orcidid><orcidid>https://orcid.org/0000-0001-9729-9667</orcidid></addata></record> |
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subjects | Amplitudes Angle of attack Computational fluid dynamics Cross flow Extreme values Fluid flow Horseshoe vortices Reynolds number Vortex shedding Vortex-induced vibrations Vortices |
title | Single degree of freedom vortex induced vibration of undulatory seal whiskers at low Reynolds number and various angles of attack: A computational fluid dynamics study |
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