Scaling Laws for the Heterogeneously Heated Free Convective Boundary Layer

The heterogeneously heated free convective boundary layer (CBL) is investigated by means of dimensional analysis and results from large-eddy simulations (LES) and direct numerical simulations (DNS). The investigated physical model is a CBL that forms in a linearly stratified atmosphere heated from t...

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Autores: van Heerwaarden, Chiel, Mellado González, Juan Pedro|||0000-0001-7506-6539, de Lozar, Alberto
Formato: artículo
Fecha de publicación:2014
País:España
Recursos:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/189748
Acesso em linha:https://hdl.handle.net/2117/189748
https://dx.doi.org/10.1175/JAS-D-13-0383.1
Access Level:acceso abierto
Palavra-chave:Eddies--Simulation methods
Boundary layer (Meteorology)
Convection (Meteorology)
Fluid dynamics
Free convection
Boundary layer
Direct numerical simultations
Dinàmica de fluids
Capa límit (Dinàmica de fluids)
Convecció (Meteorologia)
Àrees temàtiques de la UPC::Física
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repository_id_str
spelling Scaling Laws for the Heterogeneously Heated Free Convective Boundary Layervan Heerwaarden, ChielMellado González, Juan Pedro|||0000-0001-7506-6539de Lozar, AlbertoEddies--Simulation methodsBoundary layer (Meteorology)Convection (Meteorology)Fluid dynamicsFree convectionBoundary layerDirect numerical simultationsDinàmica de fluidsCapa límit (Dinàmica de fluids)Convecció (Meteorologia)Àrees temàtiques de la UPC::FísicaThe heterogeneously heated free convective boundary layer (CBL) is investigated by means of dimensional analysis and results from large-eddy simulations (LES) and direct numerical simulations (DNS). The investigated physical model is a CBL that forms in a linearly stratified atmosphere heated from the surface by square patches with a high surface buoyancy flux. Each simulation has been run long enough to show the formation of a peak in kinetic energy, corresponding to the ‘‘optimal’’ heterogeneity size with strong secondary circulations, and the subsequent transition into a horizontally homogeneous CBL. Scaling laws for the time of the optimal state and transition and for the vertically integrated kinetic energy (KE) have been developed. The laws show that the optimal state and transition do not occur at a fixed ratio of the heterogeneity size to the CBL height. Instead, these occur at a higher ratio for simulations with increasing heterogeneity sizes because of the development of structures in the downward-moving air that grow faster than the CBL thickness. The moment of occurrence of the optimal state and transition are strongly related to the heterogeneity amplitude: stronger amplitudes result in an earlier optimal state and a later transition. Furthermore, a decrease in patch size combined with a compensating increase in patch surface buoyancy flux to maintain the energy input results in decreasing KE and a later transition. The simulations suggest that a CBL with a heterogeneity size smaller than the initial CBL height has less entrainment than a horizontally homogeneous CBL, whereas one with a larger heterogeneity size has more.Peer Reviewed20142014-11-0120202020-06-02journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/189748https://dx.doi.org/10.1175/JAS-D-13-0383.1reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivs 3.0 Spainhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/1897482026-05-27T15:37:01Z
dc.title.none.fl_str_mv Scaling Laws for the Heterogeneously Heated Free Convective Boundary Layer
title Scaling Laws for the Heterogeneously Heated Free Convective Boundary Layer
spellingShingle Scaling Laws for the Heterogeneously Heated Free Convective Boundary Layer
van Heerwaarden, Chiel
Eddies--Simulation methods
Boundary layer (Meteorology)
Convection (Meteorology)
Fluid dynamics
Free convection
Boundary layer
Direct numerical simultations
Dinàmica de fluids
Capa límit (Dinàmica de fluids)
Convecció (Meteorologia)
Àrees temàtiques de la UPC::Física
title_short Scaling Laws for the Heterogeneously Heated Free Convective Boundary Layer
title_full Scaling Laws for the Heterogeneously Heated Free Convective Boundary Layer
title_fullStr Scaling Laws for the Heterogeneously Heated Free Convective Boundary Layer
title_full_unstemmed Scaling Laws for the Heterogeneously Heated Free Convective Boundary Layer
title_sort Scaling Laws for the Heterogeneously Heated Free Convective Boundary Layer
dc.creator.none.fl_str_mv van Heerwaarden, Chiel
Mellado González, Juan Pedro|||0000-0001-7506-6539
de Lozar, Alberto
author van Heerwaarden, Chiel
author_facet van Heerwaarden, Chiel
Mellado González, Juan Pedro|||0000-0001-7506-6539
de Lozar, Alberto
author_role author
author2 Mellado González, Juan Pedro|||0000-0001-7506-6539
de Lozar, Alberto
author2_role author
author
dc.subject.none.fl_str_mv Eddies--Simulation methods
Boundary layer (Meteorology)
Convection (Meteorology)
Fluid dynamics
Free convection
Boundary layer
Direct numerical simultations
Dinàmica de fluids
Capa límit (Dinàmica de fluids)
Convecció (Meteorologia)
Àrees temàtiques de la UPC::Física
topic Eddies--Simulation methods
Boundary layer (Meteorology)
Convection (Meteorology)
Fluid dynamics
Free convection
Boundary layer
Direct numerical simultations
Dinàmica de fluids
Capa límit (Dinàmica de fluids)
Convecció (Meteorologia)
Àrees temàtiques de la UPC::Física
description The heterogeneously heated free convective boundary layer (CBL) is investigated by means of dimensional analysis and results from large-eddy simulations (LES) and direct numerical simulations (DNS). The investigated physical model is a CBL that forms in a linearly stratified atmosphere heated from the surface by square patches with a high surface buoyancy flux. Each simulation has been run long enough to show the formation of a peak in kinetic energy, corresponding to the ‘‘optimal’’ heterogeneity size with strong secondary circulations, and the subsequent transition into a horizontally homogeneous CBL. Scaling laws for the time of the optimal state and transition and for the vertically integrated kinetic energy (KE) have been developed. The laws show that the optimal state and transition do not occur at a fixed ratio of the heterogeneity size to the CBL height. Instead, these occur at a higher ratio for simulations with increasing heterogeneity sizes because of the development of structures in the downward-moving air that grow faster than the CBL thickness. The moment of occurrence of the optimal state and transition are strongly related to the heterogeneity amplitude: stronger amplitudes result in an earlier optimal state and a later transition. Furthermore, a decrease in patch size combined with a compensating increase in patch surface buoyancy flux to maintain the energy input results in decreasing KE and a later transition. The simulations suggest that a CBL with a heterogeneity size smaller than the initial CBL height has less entrainment than a horizontally homogeneous CBL, whereas one with a larger heterogeneity size has more.
publishDate 2014
dc.date.none.fl_str_mv 2014
2014-11-01
2020
2020-06-02
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/189748
https://dx.doi.org/10.1175/JAS-D-13-0383.1
url https://hdl.handle.net/2117/189748
https://dx.doi.org/10.1175/JAS-D-13-0383.1
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,198674

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