LES of Flow Through and Around a Finite Patch of Thin Plates
Large eddy simulations (LESs) are performed for turbulent flow through and around a porous patch of thin vertical plates at a plate Reynolds number of Rep=5,800. The plates are arranged in a staggered pattern, presenting an elliptical planform and mimicking streamwise‐oriented blades of emergent veg...
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description | Large eddy simulations (LESs) are performed for turbulent flow through and around a porous patch of thin vertical plates at a plate Reynolds number of Rep=5,800. The plates are arranged in a staggered pattern, presenting an elliptical planform and mimicking streamwise‐oriented blades of emergent vegetation. The immersed boundary method is employed to explicitly resolve the interaction between flow and plates. Three flow cases, each with a different number of plates within the same planform area, that is, different patch density, are studied. The Reynolds number based on freestream velocity and plate length is the same in all cases. Inspection of the distribution of velocity and vorticity in the horizontal plane reveals that downstream plates are significantly impacted by the wakes from upstream plates. It is therefore proposed that the plates can be divided into two groups based on the local flow characteristics, which are a function of position within the patch: a free group and a wake group. This classification is subsequently used in the quantitative analysis of boundary layer development and drag force at plate scale. The thickness and character of the simulated boundary layers on the plates differ significantly from predictions based on analytical or empirical relationships, which is due to wake effects and the finite length of the plates. The simulations demonstrate the so‐called sheltering effect; that is, the drag forces acting on downstream plates (in the wake group) are significantly lower than those acting on upstream plates, a result of the lower approach flow speed. Although the front‐area‐to‐lateral‐area ratio of the plates is low (1/40), pressure drag is observed to be larger than friction drag for each plate. The ratio of pressure drag to the total drag at patch scale shows only very little dependence on the plate density of the patch.
Key Points
Streamwise‐oriented vegetation blades are modeled by patches of thin plates
Large eddy simulations of flow through and around the patches allows examination of hydrodynamics and boundary layers
Drag is quantified at element scale and at patch scale, and the influence of patchdensity is studied |
doi_str_mv | 10.1029/2018WR023462 |
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Key Points
Streamwise‐oriented vegetation blades are modeled by patches of thin plates
Large eddy simulations of flow through and around the patches allows examination of hydrodynamics and boundary layers
Drag is quantified at element scale and at patch scale, and the influence of patchdensity is studied</description><identifier>ISSN: 0043-1397</identifier><identifier>EISSN: 1944-7973</identifier><identifier>DOI: 10.1029/2018WR023462</identifier><language>eng</language><publisher>Washington: John Wiley & Sons, Inc</publisher><subject>boundary layer ; Boundary layers ; Dependence ; Downstream effects ; Drag ; Emergent aquatic plants ; Emergent vegetation ; Empirical analysis ; Flow characteristics ; Flow-density-speed relationships ; Fluid dynamics ; Fluid flow ; Friction drag ; Inspection ; Large eddy simulation ; Large eddy simulations ; LES ; Local flow ; Mimicry ; Planforms ; Pressure ; Pressure drag ; Reynolds number ; Thin plates ; Turbulent flow ; Upstream ; vegetation ; Velocity ; Vorticity ; Wakes</subject><ispartof>Water resources research, 2019-09, Vol.55 (9), p.7587-7605</ispartof><rights>2019. American Geophysical Union. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a3688-2b0aaa9652e3fca01c8e40ad1133d9e1250c7bd297ac4ef19e96275bd680fd53</citedby><cites>FETCH-LOGICAL-a3688-2b0aaa9652e3fca01c8e40ad1133d9e1250c7bd297ac4ef19e96275bd680fd53</cites><orcidid>0000-0001-8874-9793 ; 0000-0001-5098-7809 ; 0000-0002-4926-9524</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1029%2F2018WR023462$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F2018WR023462$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,11514,27924,27925,45574,45575,46468,46892</link.rule.ids></links><search><creatorcontrib>Gong, Yiqing</creatorcontrib><creatorcontrib>Stoesser, Thorsten</creatorcontrib><creatorcontrib>Mao, Jingqiao</creatorcontrib><creatorcontrib>McSherry, Richard</creatorcontrib><title>LES of Flow Through and Around a Finite Patch of Thin Plates</title><title>Water resources research</title><description>Large eddy simulations (LESs) are performed for turbulent flow through and around a porous patch of thin vertical plates at a plate Reynolds number of Rep=5,800. The plates are arranged in a staggered pattern, presenting an elliptical planform and mimicking streamwise‐oriented blades of emergent vegetation. The immersed boundary method is employed to explicitly resolve the interaction between flow and plates. Three flow cases, each with a different number of plates within the same planform area, that is, different patch density, are studied. The Reynolds number based on freestream velocity and plate length is the same in all cases. Inspection of the distribution of velocity and vorticity in the horizontal plane reveals that downstream plates are significantly impacted by the wakes from upstream plates. It is therefore proposed that the plates can be divided into two groups based on the local flow characteristics, which are a function of position within the patch: a free group and a wake group. This classification is subsequently used in the quantitative analysis of boundary layer development and drag force at plate scale. The thickness and character of the simulated boundary layers on the plates differ significantly from predictions based on analytical or empirical relationships, which is due to wake effects and the finite length of the plates. The simulations demonstrate the so‐called sheltering effect; that is, the drag forces acting on downstream plates (in the wake group) are significantly lower than those acting on upstream plates, a result of the lower approach flow speed. Although the front‐area‐to‐lateral‐area ratio of the plates is low (1/40), pressure drag is observed to be larger than friction drag for each plate. The ratio of pressure drag to the total drag at patch scale shows only very little dependence on the plate density of the patch.
Key Points
Streamwise‐oriented vegetation blades are modeled by patches of thin plates
Large eddy simulations of flow through and around the patches allows examination of hydrodynamics and boundary layers
Drag is quantified at element scale and at patch scale, and the influence of patchdensity is studied</description><subject>boundary layer</subject><subject>Boundary layers</subject><subject>Dependence</subject><subject>Downstream effects</subject><subject>Drag</subject><subject>Emergent aquatic plants</subject><subject>Emergent vegetation</subject><subject>Empirical analysis</subject><subject>Flow characteristics</subject><subject>Flow-density-speed relationships</subject><subject>Fluid dynamics</subject><subject>Fluid flow</subject><subject>Friction drag</subject><subject>Inspection</subject><subject>Large eddy simulation</subject><subject>Large eddy simulations</subject><subject>LES</subject><subject>Local flow</subject><subject>Mimicry</subject><subject>Planforms</subject><subject>Pressure</subject><subject>Pressure drag</subject><subject>Reynolds number</subject><subject>Thin plates</subject><subject>Turbulent flow</subject><subject>Upstream</subject><subject>vegetation</subject><subject>Velocity</subject><subject>Vorticity</subject><subject>Wakes</subject><issn>0043-1397</issn><issn>1944-7973</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNp90EtLw0AUBeBBFKyPnT9gwK3RO3cm8wA3pbQqFCw10OUwTSYmJSZ1JqX035tSF65cnbv4OBcOIXcMHhmgeUJgerUE5ELiGRkxI0SijOLnZAQgeMK4UZfkKsYNABOpVCPyPJ9-0K6ks6bb06wK3e6zoq4t6Hg4h3B0Vrd17-nC9Xl1lFlVt3TRuN7HG3JRuib629-8Jtlsmk1ek_n7y9tkPE8cl1onuAbnnJEpel7mDliuvQBXMMZ5YTzDFHK1LtAolwtfMuONRJWuC6mhLFJ-Te5PtdvQfe987O2m24V2-GiRg0ZpEPWgHk4qD12MwZd2G-ovFw6WgT3OY__OM3B-4vu68Yd_rV0tJ0sUIDX_AT4cY9o</recordid><startdate>201909</startdate><enddate>201909</enddate><creator>Gong, Yiqing</creator><creator>Stoesser, Thorsten</creator><creator>Mao, Jingqiao</creator><creator>McSherry, Richard</creator><general>John Wiley & Sons, Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QH</scope><scope>7QL</scope><scope>7T7</scope><scope>7TG</scope><scope>7U9</scope><scope>7UA</scope><scope>8FD</scope><scope>C1K</scope><scope>F1W</scope><scope>FR3</scope><scope>H94</scope><scope>H96</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>M7N</scope><scope>P64</scope><orcidid>https://orcid.org/0000-0001-8874-9793</orcidid><orcidid>https://orcid.org/0000-0001-5098-7809</orcidid><orcidid>https://orcid.org/0000-0002-4926-9524</orcidid></search><sort><creationdate>201909</creationdate><title>LES of Flow Through and Around a Finite Patch of Thin Plates</title><author>Gong, Yiqing ; Stoesser, Thorsten ; Mao, Jingqiao ; McSherry, Richard</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a3688-2b0aaa9652e3fca01c8e40ad1133d9e1250c7bd297ac4ef19e96275bd680fd53</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>boundary layer</topic><topic>Boundary layers</topic><topic>Dependence</topic><topic>Downstream effects</topic><topic>Drag</topic><topic>Emergent aquatic plants</topic><topic>Emergent vegetation</topic><topic>Empirical analysis</topic><topic>Flow characteristics</topic><topic>Flow-density-speed relationships</topic><topic>Fluid dynamics</topic><topic>Fluid flow</topic><topic>Friction drag</topic><topic>Inspection</topic><topic>Large eddy simulation</topic><topic>Large eddy simulations</topic><topic>LES</topic><topic>Local flow</topic><topic>Mimicry</topic><topic>Planforms</topic><topic>Pressure</topic><topic>Pressure drag</topic><topic>Reynolds number</topic><topic>Thin plates</topic><topic>Turbulent flow</topic><topic>Upstream</topic><topic>vegetation</topic><topic>Velocity</topic><topic>Vorticity</topic><topic>Wakes</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Gong, Yiqing</creatorcontrib><creatorcontrib>Stoesser, Thorsten</creatorcontrib><creatorcontrib>Mao, Jingqiao</creatorcontrib><creatorcontrib>McSherry, Richard</creatorcontrib><collection>CrossRef</collection><collection>Aqualine</collection><collection>Bacteriology Abstracts (Microbiology B)</collection><collection>Industrial and Applied Microbiology Abstracts (Microbiology A)</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Virology and AIDS Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>AIDS and Cancer Research Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>Biotechnology and BioEngineering Abstracts</collection><jtitle>Water resources research</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Gong, Yiqing</au><au>Stoesser, Thorsten</au><au>Mao, Jingqiao</au><au>McSherry, Richard</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>LES of Flow Through and Around a Finite Patch of Thin Plates</atitle><jtitle>Water resources research</jtitle><date>2019-09</date><risdate>2019</risdate><volume>55</volume><issue>9</issue><spage>7587</spage><epage>7605</epage><pages>7587-7605</pages><issn>0043-1397</issn><eissn>1944-7973</eissn><abstract>Large eddy simulations (LESs) are performed for turbulent flow through and around a porous patch of thin vertical plates at a plate Reynolds number of Rep=5,800. The plates are arranged in a staggered pattern, presenting an elliptical planform and mimicking streamwise‐oriented blades of emergent vegetation. The immersed boundary method is employed to explicitly resolve the interaction between flow and plates. Three flow cases, each with a different number of plates within the same planform area, that is, different patch density, are studied. The Reynolds number based on freestream velocity and plate length is the same in all cases. Inspection of the distribution of velocity and vorticity in the horizontal plane reveals that downstream plates are significantly impacted by the wakes from upstream plates. It is therefore proposed that the plates can be divided into two groups based on the local flow characteristics, which are a function of position within the patch: a free group and a wake group. This classification is subsequently used in the quantitative analysis of boundary layer development and drag force at plate scale. The thickness and character of the simulated boundary layers on the plates differ significantly from predictions based on analytical or empirical relationships, which is due to wake effects and the finite length of the plates. The simulations demonstrate the so‐called sheltering effect; that is, the drag forces acting on downstream plates (in the wake group) are significantly lower than those acting on upstream plates, a result of the lower approach flow speed. Although the front‐area‐to‐lateral‐area ratio of the plates is low (1/40), pressure drag is observed to be larger than friction drag for each plate. The ratio of pressure drag to the total drag at patch scale shows only very little dependence on the plate density of the patch.
Key Points
Streamwise‐oriented vegetation blades are modeled by patches of thin plates
Large eddy simulations of flow through and around the patches allows examination of hydrodynamics and boundary layers
Drag is quantified at element scale and at patch scale, and the influence of patchdensity is studied</abstract><cop>Washington</cop><pub>John Wiley & Sons, Inc</pub><doi>10.1029/2018WR023462</doi><tpages>19</tpages><orcidid>https://orcid.org/0000-0001-8874-9793</orcidid><orcidid>https://orcid.org/0000-0001-5098-7809</orcidid><orcidid>https://orcid.org/0000-0002-4926-9524</orcidid><oa>free_for_read</oa></addata></record> |
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source | Free E-Journal (出版社公開部分のみ); Wiley-Blackwell AGU Digital Archive; Wiley Online Library (Online service) |
subjects | boundary layer Boundary layers Dependence Downstream effects Drag Emergent aquatic plants Emergent vegetation Empirical analysis Flow characteristics Flow-density-speed relationships Fluid dynamics Fluid flow Friction drag Inspection Large eddy simulation Large eddy simulations LES Local flow Mimicry Planforms Pressure Pressure drag Reynolds number Thin plates Turbulent flow Upstream vegetation Velocity Vorticity Wakes |
title | LES of Flow Through and Around a Finite Patch of Thin Plates |
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