Sedimentation in particle-laden flows with and without velocity shear
The vertical transport of sediment from particle-laden flows in marine settings can be enhanced by a settling-driven convective instability. The presence of a horizontal velocity shear can further influence this vertical transport. We conduct numerical simulations to investigate the vertical sedimen...
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Veröffentlicht in: | Physics of fluids (1994) 2023-08, Vol.35 (8) |
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creator | Olsthoorn, J. Timmermans, M.-L. |
description | The vertical transport of sediment from particle-laden flows in marine settings can be enhanced by a settling-driven convective instability. The presence of a horizontal velocity shear can further influence this vertical transport. We conduct numerical simulations to investigate the vertical sediment transport in the presence and absence of shear. We show how this transport is determined by a competition between the growth of the settling-driven convective instability (Rayleigh–Taylor) and the stratified shear instability (Kelvin–Helmholtz). In the absence of shear, the Rayleigh–Taylor instability drives enhanced vertical sediment transport; this effect increases with the Stokes settling velocity of the particles and decreases with the stratification strength. In the presence of shear, there are two regimes of effective settling. When the Kelvin–Helmholtz instability grows rapidly and suppresses the Rayleigh–Taylor instability, the effective settling velocity is significantly reduced. On the other hand, if the Rayleigh–Taylor instability dominates and completely inhibits the Kelvin–Helmholtz instability, the effective settling velocity is enhanced due to the additional energy input by shear. We explore the parameter space of these regimes and interpret their physics. |
doi_str_mv | 10.1063/5.0159676 |
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The presence of a horizontal velocity shear can further influence this vertical transport. We conduct numerical simulations to investigate the vertical sediment transport in the presence and absence of shear. We show how this transport is determined by a competition between the growth of the settling-driven convective instability (Rayleigh–Taylor) and the stratified shear instability (Kelvin–Helmholtz). In the absence of shear, the Rayleigh–Taylor instability drives enhanced vertical sediment transport; this effect increases with the Stokes settling velocity of the particles and decreases with the stratification strength. In the presence of shear, there are two regimes of effective settling. When the Kelvin–Helmholtz instability grows rapidly and suppresses the Rayleigh–Taylor instability, the effective settling velocity is significantly reduced. On the other hand, if the Rayleigh–Taylor instability dominates and completely inhibits the Kelvin–Helmholtz instability, the effective settling velocity is enhanced due to the additional energy input by shear. We explore the parameter space of these regimes and interpret their physics.</description><identifier>ISSN: 1070-6631</identifier><identifier>EISSN: 1089-7666</identifier><identifier>DOI: 10.1063/5.0159676</identifier><identifier>CODEN: PHFLE6</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Fluid dynamics ; Kelvin-Helmholtz instability ; Physics ; Sediment transport ; Settling velocity ; Shear ; Taylor instability ; Velocity</subject><ispartof>Physics of fluids (1994), 2023-08, Vol.35 (8)</ispartof><rights>Author(s)</rights><rights>2023 Author(s). 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The presence of a horizontal velocity shear can further influence this vertical transport. We conduct numerical simulations to investigate the vertical sediment transport in the presence and absence of shear. We show how this transport is determined by a competition between the growth of the settling-driven convective instability (Rayleigh–Taylor) and the stratified shear instability (Kelvin–Helmholtz). In the absence of shear, the Rayleigh–Taylor instability drives enhanced vertical sediment transport; this effect increases with the Stokes settling velocity of the particles and decreases with the stratification strength. In the presence of shear, there are two regimes of effective settling. When the Kelvin–Helmholtz instability grows rapidly and suppresses the Rayleigh–Taylor instability, the effective settling velocity is significantly reduced. On the other hand, if the Rayleigh–Taylor instability dominates and completely inhibits the Kelvin–Helmholtz instability, the effective settling velocity is enhanced due to the additional energy input by shear. We explore the parameter space of these regimes and interpret their physics.</description><subject>Fluid dynamics</subject><subject>Kelvin-Helmholtz instability</subject><subject>Physics</subject><subject>Sediment transport</subject><subject>Settling velocity</subject><subject>Shear</subject><subject>Taylor instability</subject><subject>Velocity</subject><issn>1070-6631</issn><issn>1089-7666</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2023</creationdate><recordtype>article</recordtype><recordid>eNp9kE1LAzEQhoMoWKsH_0HAk8LWfGyyyVFKq0LBg3oO2d0JTdluapJa-u_dfpy9zLyHhxneB6F7SiaUSP4sJoQKLSt5gUaUKF1UUsrLQ65IISWn1-gmpRUhhGsmR2j2Ca1fQ59t9qHHvscbG7NvOig620KPXRd2Ce98XmLbt8cQthn_Qhcan_c4LcHGW3TlbJfg7rzH6Hs--5q-FYuP1_fpy6JoOKtyoajjADUjwjnrSueAMckU47ps61oxoewwFW9LonUrNKEOaCUULytRS97wMXo43d3E8LOFlM0qbGM_vDRMlUqUXAzFxujxRDUxpBTBmU30axv3hhJzsGSEOVsa2KcTm4Y2Rwf_wH9y22Y9</recordid><startdate>202308</startdate><enddate>202308</enddate><creator>Olsthoorn, J.</creator><creator>Timmermans, M.-L.</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/0000-0003-2718-2556</orcidid><orcidid>https://orcid.org/0000-0003-1401-2080</orcidid><orcidid>https://orcid.org/0000-0002-3730-6156</orcidid></search><sort><creationdate>202308</creationdate><title>Sedimentation in particle-laden flows with and without velocity shear</title><author>Olsthoorn, J. ; Timmermans, M.-L.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c327t-81f3eeb205ffaf4ffe226282394dbb8258ab8283d4099d5901fe17583475b63c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2023</creationdate><topic>Fluid dynamics</topic><topic>Kelvin-Helmholtz instability</topic><topic>Physics</topic><topic>Sediment transport</topic><topic>Settling velocity</topic><topic>Shear</topic><topic>Taylor instability</topic><topic>Velocity</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Olsthoorn, J.</creatorcontrib><creatorcontrib>Timmermans, M.-L.</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>Olsthoorn, J.</au><au>Timmermans, M.-L.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Sedimentation in particle-laden flows with and without velocity shear</atitle><jtitle>Physics of fluids (1994)</jtitle><date>2023-08</date><risdate>2023</risdate><volume>35</volume><issue>8</issue><issn>1070-6631</issn><eissn>1089-7666</eissn><coden>PHFLE6</coden><abstract>The vertical transport of sediment from particle-laden flows in marine settings can be enhanced by a settling-driven convective instability. The presence of a horizontal velocity shear can further influence this vertical transport. We conduct numerical simulations to investigate the vertical sediment transport in the presence and absence of shear. We show how this transport is determined by a competition between the growth of the settling-driven convective instability (Rayleigh–Taylor) and the stratified shear instability (Kelvin–Helmholtz). In the absence of shear, the Rayleigh–Taylor instability drives enhanced vertical sediment transport; this effect increases with the Stokes settling velocity of the particles and decreases with the stratification strength. In the presence of shear, there are two regimes of effective settling. When the Kelvin–Helmholtz instability grows rapidly and suppresses the Rayleigh–Taylor instability, the effective settling velocity is significantly reduced. On the other hand, if the Rayleigh–Taylor instability dominates and completely inhibits the Kelvin–Helmholtz instability, the effective settling velocity is enhanced due to the additional energy input by shear. We explore the parameter space of these regimes and interpret their physics.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/5.0159676</doi><tpages>15</tpages><orcidid>https://orcid.org/0000-0003-2718-2556</orcidid><orcidid>https://orcid.org/0000-0003-1401-2080</orcidid><orcidid>https://orcid.org/0000-0002-3730-6156</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Fluid dynamics Kelvin-Helmholtz instability Physics Sediment transport Settling velocity Shear Taylor instability Velocity |
title | Sedimentation in particle-laden flows with and without velocity shear |
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