Extension at the downstream end of turbulent band in channel flow
In this Letter, the velocity structures and the extension behavior of localized turbulent bands in channel flows are measured by particle image velocimetry in a plane parallel to the walls and are analyzed by comparing with direct numerical simulations at low Reynolds numbers. It is illustrated that...
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| Veröffentlicht in: | Physics of fluids (1994) 2020-12, Vol.32 (12) |
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| container_title | Physics of fluids (1994) |
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| creator | Liu, Jinsheng Xiao, Yue Zhang, Linsen Li, Mogeng Tao, Jianjun Xu, Shengjin |
| description | In this Letter, the velocity structures and the extension behavior of localized turbulent bands in channel flows are measured by particle image velocimetry in a plane parallel to the walls and are analyzed by comparing with direct numerical simulations at low Reynolds numbers. It is illustrated that the convection velocity of the band head (band’s downstream end) is not determined by the formation and propagation of low-speed streaks but by a high-speed “hat” shaped region near the band head. This “hat” region travels downstream obliquely like a solitary wave and leaves newly generated low-speed streaks to travel slowly in the spanwise direction, leading to the head extension of turbulent bands. |
| doi_str_mv | 10.1063/5.0032272 |
| format | Article |
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It is illustrated that the convection velocity of the band head (band’s downstream end) is not determined by the formation and propagation of low-speed streaks but by a high-speed “hat” shaped region near the band head. This “hat” region travels downstream obliquely like a solitary wave and leaves newly generated low-speed streaks to travel slowly in the spanwise direction, leading to the head extension of turbulent bands.</description><identifier>ISSN: 1070-6631</identifier><identifier>EISSN: 1089-7666</identifier><identifier>DOI: 10.1063/5.0032272</identifier><identifier>CODEN: PHFLE6</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Banded structure ; Channel flow ; Computational fluid dynamics ; Convection ; Direct numerical simulation ; Fluid dynamics ; Fluid flow ; Low speed ; Particle image velocimetry ; Physics ; Solitary waves ; Turbulent flow ; Velocity</subject><ispartof>Physics of fluids (1994), 2020-12, Vol.32 (12)</ispartof><rights>Author(s)</rights><rights>2020 Author(s). 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This “hat” region travels downstream obliquely like a solitary wave and leaves newly generated low-speed streaks to travel slowly in the spanwise direction, leading to the head extension of turbulent bands.</description><subject>Banded structure</subject><subject>Channel flow</subject><subject>Computational fluid dynamics</subject><subject>Convection</subject><subject>Direct numerical simulation</subject><subject>Fluid dynamics</subject><subject>Fluid flow</subject><subject>Low speed</subject><subject>Particle image velocimetry</subject><subject>Physics</subject><subject>Solitary waves</subject><subject>Turbulent flow</subject><subject>Velocity</subject><issn>1070-6631</issn><issn>1089-7666</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp90E1LAzEQBuAgCtbqwX8Q8KSwNR9NsnsspX5AwYueQ3Z3Qrdsk5pkrf57U1r0IHiaYeZhBl6ErimZUCL5vZgQwhlT7ASNKCmrQkkpT_e9IoWUnJ6jixjXJKuKyRGaLT4TuNh5h03CaQW49TsXUwCzweBa7C1OQ6iHHlzCtcmTzuFmZZyDHtve7y7RmTV9hKtjHaO3h8Xr_KlYvjw-z2fLopmyMhUCFFOtZC0Xta0IGLACKKu4FKq0XImqgUbUTFWGWiFqKG1ppywvGbOUAB-jm8PdbfDvA8Sk134ILr_UbCoV41TxMqvbg2qCjzGA1dvQbUz40pTofUJa6GNC2d4dbGy6ZFLO4Ad_-PAL9ba1_-G_l78BE8FzAA</recordid><startdate>20201201</startdate><enddate>20201201</enddate><creator>Liu, Jinsheng</creator><creator>Xiao, Yue</creator><creator>Zhang, Linsen</creator><creator>Li, Mogeng</creator><creator>Tao, Jianjun</creator><creator>Xu, Shengjin</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/0000-0003-4605-1076</orcidid><orcidid>https://orcid.org/0000-0002-9875-6468</orcidid></search><sort><creationdate>20201201</creationdate><title>Extension at the downstream end of turbulent band in channel flow</title><author>Liu, Jinsheng ; Xiao, Yue ; Zhang, Linsen ; Li, Mogeng ; Tao, Jianjun ; Xu, Shengjin</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c428t-5e727d62d35bf90eaef5e12936578f3759cec5b279a1f55be8f8f4257822f10e3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Banded structure</topic><topic>Channel flow</topic><topic>Computational fluid dynamics</topic><topic>Convection</topic><topic>Direct numerical simulation</topic><topic>Fluid dynamics</topic><topic>Fluid flow</topic><topic>Low speed</topic><topic>Particle image velocimetry</topic><topic>Physics</topic><topic>Solitary waves</topic><topic>Turbulent flow</topic><topic>Velocity</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Liu, Jinsheng</creatorcontrib><creatorcontrib>Xiao, Yue</creatorcontrib><creatorcontrib>Zhang, Linsen</creatorcontrib><creatorcontrib>Li, Mogeng</creatorcontrib><creatorcontrib>Tao, Jianjun</creatorcontrib><creatorcontrib>Xu, Shengjin</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>Liu, Jinsheng</au><au>Xiao, Yue</au><au>Zhang, Linsen</au><au>Li, Mogeng</au><au>Tao, Jianjun</au><au>Xu, Shengjin</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Extension at the downstream end of turbulent band in channel flow</atitle><jtitle>Physics of fluids (1994)</jtitle><date>2020-12-01</date><risdate>2020</risdate><volume>32</volume><issue>12</issue><issn>1070-6631</issn><eissn>1089-7666</eissn><coden>PHFLE6</coden><abstract>In this Letter, the velocity structures and the extension behavior of localized turbulent bands in channel flows are measured by particle image velocimetry in a plane parallel to the walls and are analyzed by comparing with direct numerical simulations at low Reynolds numbers. 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| ispartof | Physics of fluids (1994), 2020-12, Vol.32 (12) |
| issn | 1070-6631 1089-7666 |
| language | eng |
| recordid | cdi_scitation_primary_10_1063_5_0032272 |
| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | Banded structure Channel flow Computational fluid dynamics Convection Direct numerical simulation Fluid dynamics Fluid flow Low speed Particle image velocimetry Physics Solitary waves Turbulent flow Velocity |
| title | Extension at the downstream end of turbulent band in channel flow |
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