Effect of self-stratification on sediment diffusivity in channel flows and boundary layers: a study using direct numerical simulations

Autores
Dutta, S.; Cantero, Mariano Ignacio; García, Marcelo Horacio
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Sediment transport in nature comprises of bedload and suspended load, and precise modelling of these processes is essential for accurate sediment flux estimation. Traditionally, non-cohesive suspended sediment has been modelled using the advection–diffusion equation (Garcia, 2008), where the success of the model is largely dependent on accurate approximation of the sediment diffusion coefficients. The current study explores the effect of self-stratification on sediment diffusivity using suspended sediment concentration data from direct numerical simulations (DNS) of flows subjected to different levels of stratification, where the level of stratification is dependent on the particle size (parameterized using particle fall velocity Ṽ and volume-averaged sediment concentration (parameterized using shear Richardson number Riτ. Two distinct configurations were explored, first the channel flow configuration (similar to flow in a pipe or a duct) and second, a boundary-layer configuration (similar to open-channel flow). Self-stratification was found to modulate the turbulence intensity (Cantero et al., 2009b), which in turn was found to reduce vertical sediment diffusivity in portions of the domain exposed to turbulence damping. The effect of particle size on vertical sediment diffusivity has been studied in the past by several authors (Rouse, 1937; Coleman, 1970; Nielsen and Teakle, 2004); so in addition to the effect of particle size, the current study also explores the effect of sediment concentration on vertical sediment diffusivity. The results from the DNS simulations were compared with experiments (Ismail, 1952; Coleman, 1986) and field measurements (Coleman, 1970), and were found to agree qualitatively, especially for the case of channel flows. The aim of the study is to understand the effect of stratification due to suspended sediment on vertical sediment diffusivity for different flow configurations, in order to gain insight of the underlying physics, which will eventually help us to improve the existing models for sediment diffusivity.
Fil: Dutta, S.. University of Illinois. Urbana - Champaign; Estados Unidos
Fil: Cantero, Mariano Ignacio. Comision Nacional de Energia Atomica. Fundación Jose A. Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: García, Marcelo Horacio. University of Illinois. Urbana - Champaign; Estados Unidos
Materia
DNS
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/29483
Acceder
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spelling Effect of self-stratification on sediment diffusivity in channel flows and boundary layers: a study using direct numerical simulationsDutta, S.Cantero, Mariano IgnacioGarcía, Marcelo HoracioDNSSediment transport in nature comprises of bedload and suspended load, and precise modelling of these processes is essential for accurate sediment flux estimation. Traditionally, non-cohesive suspended sediment has been modelled using the advection–diffusion equation (Garcia, 2008), where the success of the model is largely dependent on accurate approximation of the sediment diffusion coefficients. The current study explores the effect of self-stratification on sediment diffusivity using suspended sediment concentration data from direct numerical simulations (DNS) of flows subjected to different levels of stratification, where the level of stratification is dependent on the particle size (parameterized using particle fall velocity Ṽ and volume-averaged sediment concentration (parameterized using shear Richardson number Riτ. Two distinct configurations were explored, first the channel flow configuration (similar to flow in a pipe or a duct) and second, a boundary-layer configuration (similar to open-channel flow). Self-stratification was found to modulate the turbulence intensity (Cantero et al., 2009b), which in turn was found to reduce vertical sediment diffusivity in portions of the domain exposed to turbulence damping. The effect of particle size on vertical sediment diffusivity has been studied in the past by several authors (Rouse, 1937; Coleman, 1970; Nielsen and Teakle, 2004); so in addition to the effect of particle size, the current study also explores the effect of sediment concentration on vertical sediment diffusivity. The results from the DNS simulations were compared with experiments (Ismail, 1952; Coleman, 1986) and field measurements (Coleman, 1970), and were found to agree qualitatively, especially for the case of channel flows. The aim of the study is to understand the effect of stratification due to suspended sediment on vertical sediment diffusivity for different flow configurations, in order to gain insight of the underlying physics, which will eventually help us to improve the existing models for sediment diffusivity.Fil: Dutta, S.. University of Illinois. Urbana - Champaign; Estados UnidosFil: Cantero, Mariano Ignacio. Comision Nacional de Energia Atomica. Fundación Jose A. Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: García, Marcelo Horacio. University of Illinois. Urbana - Champaign; Estados UnidosEuropean Geosciences Union2014-08-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/29483Dutta, S.; Cantero, Mariano Ignacio; García, Marcelo Horacio; Effect of self-stratification on sediment diffusivity in channel flows and boundary layers: a study using direct numerical simulations; European Geosciences Union; Earth Surface Dynamics; 2; 2; 6-8-2014; 419-4312196-6311CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.5194/esurf-2-419-2014info:eu-repo/semantics/altIdentifier/url/https://www.earth-surf-dynam.net/2/419/2014/info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:12:25Zoai:ri.conicet.gov.ar:11336/29483instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-10 13:12:25.728CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Effect of self-stratification on sediment diffusivity in channel flows and boundary layers: a study using direct numerical simulations
title Effect of self-stratification on sediment diffusivity in channel flows and boundary layers: a study using direct numerical simulations
spellingShingle Effect of self-stratification on sediment diffusivity in channel flows and boundary layers: a study using direct numerical simulations
Dutta, S.
DNS
title_short Effect of self-stratification on sediment diffusivity in channel flows and boundary layers: a study using direct numerical simulations
title_full Effect of self-stratification on sediment diffusivity in channel flows and boundary layers: a study using direct numerical simulations
title_fullStr Effect of self-stratification on sediment diffusivity in channel flows and boundary layers: a study using direct numerical simulations
title_full_unstemmed Effect of self-stratification on sediment diffusivity in channel flows and boundary layers: a study using direct numerical simulations
title_sort Effect of self-stratification on sediment diffusivity in channel flows and boundary layers: a study using direct numerical simulations
dc.creator.none.fl_str_mv Dutta, S.
Cantero, Mariano Ignacio
García, Marcelo Horacio
author Dutta, S.
author_facet Dutta, S.
Cantero, Mariano Ignacio
García, Marcelo Horacio
author_role author
author2 Cantero, Mariano Ignacio
García, Marcelo Horacio
author2_role author
author
dc.subject.none.fl_str_mv DNS
topic DNS
dc.description.none.fl_txt_mv Sediment transport in nature comprises of bedload and suspended load, and precise modelling of these processes is essential for accurate sediment flux estimation. Traditionally, non-cohesive suspended sediment has been modelled using the advection–diffusion equation (Garcia, 2008), where the success of the model is largely dependent on accurate approximation of the sediment diffusion coefficients. The current study explores the effect of self-stratification on sediment diffusivity using suspended sediment concentration data from direct numerical simulations (DNS) of flows subjected to different levels of stratification, where the level of stratification is dependent on the particle size (parameterized using particle fall velocity Ṽ and volume-averaged sediment concentration (parameterized using shear Richardson number Riτ. Two distinct configurations were explored, first the channel flow configuration (similar to flow in a pipe or a duct) and second, a boundary-layer configuration (similar to open-channel flow). Self-stratification was found to modulate the turbulence intensity (Cantero et al., 2009b), which in turn was found to reduce vertical sediment diffusivity in portions of the domain exposed to turbulence damping. The effect of particle size on vertical sediment diffusivity has been studied in the past by several authors (Rouse, 1937; Coleman, 1970; Nielsen and Teakle, 2004); so in addition to the effect of particle size, the current study also explores the effect of sediment concentration on vertical sediment diffusivity. The results from the DNS simulations were compared with experiments (Ismail, 1952; Coleman, 1986) and field measurements (Coleman, 1970), and were found to agree qualitatively, especially for the case of channel flows. The aim of the study is to understand the effect of stratification due to suspended sediment on vertical sediment diffusivity for different flow configurations, in order to gain insight of the underlying physics, which will eventually help us to improve the existing models for sediment diffusivity.
Fil: Dutta, S.. University of Illinois. Urbana - Champaign; Estados Unidos
Fil: Cantero, Mariano Ignacio. Comision Nacional de Energia Atomica. Fundación Jose A. Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: García, Marcelo Horacio. University of Illinois. Urbana - Champaign; Estados Unidos
description Sediment transport in nature comprises of bedload and suspended load, and precise modelling of these processes is essential for accurate sediment flux estimation. Traditionally, non-cohesive suspended sediment has been modelled using the advection–diffusion equation (Garcia, 2008), where the success of the model is largely dependent on accurate approximation of the sediment diffusion coefficients. The current study explores the effect of self-stratification on sediment diffusivity using suspended sediment concentration data from direct numerical simulations (DNS) of flows subjected to different levels of stratification, where the level of stratification is dependent on the particle size (parameterized using particle fall velocity Ṽ and volume-averaged sediment concentration (parameterized using shear Richardson number Riτ. Two distinct configurations were explored, first the channel flow configuration (similar to flow in a pipe or a duct) and second, a boundary-layer configuration (similar to open-channel flow). Self-stratification was found to modulate the turbulence intensity (Cantero et al., 2009b), which in turn was found to reduce vertical sediment diffusivity in portions of the domain exposed to turbulence damping. The effect of particle size on vertical sediment diffusivity has been studied in the past by several authors (Rouse, 1937; Coleman, 1970; Nielsen and Teakle, 2004); so in addition to the effect of particle size, the current study also explores the effect of sediment concentration on vertical sediment diffusivity. The results from the DNS simulations were compared with experiments (Ismail, 1952; Coleman, 1986) and field measurements (Coleman, 1970), and were found to agree qualitatively, especially for the case of channel flows. The aim of the study is to understand the effect of stratification due to suspended sediment on vertical sediment diffusivity for different flow configurations, in order to gain insight of the underlying physics, which will eventually help us to improve the existing models for sediment diffusivity.
publishDate 2014
dc.date.none.fl_str_mv 2014-08-06
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/29483
Dutta, S.; Cantero, Mariano Ignacio; García, Marcelo Horacio; Effect of self-stratification on sediment diffusivity in channel flows and boundary layers: a study using direct numerical simulations; European Geosciences Union; Earth Surface Dynamics; 2; 2; 6-8-2014; 419-431
2196-6311
CONICET Digital
CONICET
url http://hdl.handle.net/11336/29483
identifier_str_mv Dutta, S.; Cantero, Mariano Ignacio; García, Marcelo Horacio; Effect of self-stratification on sediment diffusivity in channel flows and boundary layers: a study using direct numerical simulations; European Geosciences Union; Earth Surface Dynamics; 2; 2; 6-8-2014; 419-431
2196-6311
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.5194/esurf-2-419-2014
info:eu-repo/semantics/altIdentifier/url/https://www.earth-surf-dynam.net/2/419/2014/
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv European Geosciences Union
publisher.none.fl_str_mv European Geosciences Union
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 12.993085

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