Geometry and dynamics of coherent structures in the stably stratified atmospheric boundary layer ...
Turbulence in stable boundary layers (SBL) is often accompanied by the presence of large patches of non-turbulent flow regions, even close to the wall, a phenomenon referred in literature as global intermittency. Understanding the physical processes and dynamics of this mode of rotating, stratified...
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ftdatacite:10.17169/refubium-43180 2024-09-09T19:27:55+00:00 Geometry and dynamics of coherent structures in the stably stratified atmospheric boundary layer ... Paraswarar Harikrishnan, Abhishek 2023 https://dx.doi.org/10.17169/refubium-43180 https://refubium.fu-berlin.de/handle/fub188/43463 unknown Freie Universität Berlin http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen Coherent structures Atmospheric boundary layer Stably stratified flow Slender vortex motion 000 Computer science, information, and general works000 Computer Science, knowledge, systems004 Data processing and Computer science 500 Natural sciences and mathematics510 Mathematics518 Numerical analysis 500 Natural sciences and mathematics530 Physics532 Fluid mechanics; Liquid mechanics 500 Natural sciences and mathematics550 Earth sciences551 Geology, hydrology, meteorology Thesis Dissertation Text thesis 2023 ftdatacite https://doi.org/10.17169/refubium-43180 2024-06-17T09:24:29Z Turbulence in stable boundary layers (SBL) is often accompanied by the presence of large patches of non-turbulent flow regions, even close to the wall, a phenomenon referred in literature as global intermittency. Understanding the physical processes and dynamics of this mode of rotating, stratified and intermittent turbulence is important for the improvement of existing and/or development of new parametrizations of the SBL, which in turn, may be useful for many applications, including but not limited to numerical weather prediction, modeling gas dispersion events and understanding the Arctic climate system. In this thesis, the SBL is investigated by establishing a detailed comparison with the well-studied neutrally stratified atmospheric boundary layer. The datasets examined here were inherited through the work of Ansorge (Dissertation, Springer 2016). They used a simplified physical configuration, namely, an Ekman flow over a smooth wall where global intermittency is known to occur beyond a certain ... : Die Turbulenz in stabilen Grenzschichten (SG) geht häufig mit dem Vorhandensein großer Bereiche nichtturbulenter Strömungsregionen selbst in Wandnähe einher, ein Phänomen, das in der Literatur als globale Intermittenz bezeichnet wird. In dieser Arbeit wird die SG untersucht, indem ein detaillierter Vergleich mit der gut untersuchten neutral geschichteten atmosphärischen Grenzschicht angestellt wird. Die hier untersuchten Datensätze stammen aus der Arbeit von Ansorge (Dissertation, Springer 2016). Sie verwendeten eine vereinfachte physikalische Konfiguration, nämlich eine Ekman-Strömung über einer glatten Wand, bei der bekanntlich jenseits einer bestimmten Stabilität eine globale Intermittenz auftritt. Vergleiche zwischen beiden Regimen werden mit Hilfe kohärenter Strukturen, insbesondere ihrer Geometrie, durchgeführt. Wurde die von Robinson (Dissertation, Stanford 1991) eingeführte Klassifizierung von Grenzschichtstrukturen erwendet, die im Folgenden als Robinson-Strukturen bezeichnet werden, um die ... Text Arctic DataCite Arctic |
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Coherent structures Atmospheric boundary layer Stably stratified flow Slender vortex motion 000 Computer science, information, and general works000 Computer Science, knowledge, systems004 Data processing and Computer science 500 Natural sciences and mathematics510 Mathematics518 Numerical analysis 500 Natural sciences and mathematics530 Physics532 Fluid mechanics; Liquid mechanics 500 Natural sciences and mathematics550 Earth sciences551 Geology, hydrology, meteorology |
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Coherent structures Atmospheric boundary layer Stably stratified flow Slender vortex motion 000 Computer science, information, and general works000 Computer Science, knowledge, systems004 Data processing and Computer science 500 Natural sciences and mathematics510 Mathematics518 Numerical analysis 500 Natural sciences and mathematics530 Physics532 Fluid mechanics; Liquid mechanics 500 Natural sciences and mathematics550 Earth sciences551 Geology, hydrology, meteorology Paraswarar Harikrishnan, Abhishek Geometry and dynamics of coherent structures in the stably stratified atmospheric boundary layer ... |
topic_facet |
Coherent structures Atmospheric boundary layer Stably stratified flow Slender vortex motion 000 Computer science, information, and general works000 Computer Science, knowledge, systems004 Data processing and Computer science 500 Natural sciences and mathematics510 Mathematics518 Numerical analysis 500 Natural sciences and mathematics530 Physics532 Fluid mechanics; Liquid mechanics 500 Natural sciences and mathematics550 Earth sciences551 Geology, hydrology, meteorology |
description |
Turbulence in stable boundary layers (SBL) is often accompanied by the presence of large patches of non-turbulent flow regions, even close to the wall, a phenomenon referred in literature as global intermittency. Understanding the physical processes and dynamics of this mode of rotating, stratified and intermittent turbulence is important for the improvement of existing and/or development of new parametrizations of the SBL, which in turn, may be useful for many applications, including but not limited to numerical weather prediction, modeling gas dispersion events and understanding the Arctic climate system. In this thesis, the SBL is investigated by establishing a detailed comparison with the well-studied neutrally stratified atmospheric boundary layer. The datasets examined here were inherited through the work of Ansorge (Dissertation, Springer 2016). They used a simplified physical configuration, namely, an Ekman flow over a smooth wall where global intermittency is known to occur beyond a certain ... : Die Turbulenz in stabilen Grenzschichten (SG) geht häufig mit dem Vorhandensein großer Bereiche nichtturbulenter Strömungsregionen selbst in Wandnähe einher, ein Phänomen, das in der Literatur als globale Intermittenz bezeichnet wird. In dieser Arbeit wird die SG untersucht, indem ein detaillierter Vergleich mit der gut untersuchten neutral geschichteten atmosphärischen Grenzschicht angestellt wird. Die hier untersuchten Datensätze stammen aus der Arbeit von Ansorge (Dissertation, Springer 2016). Sie verwendeten eine vereinfachte physikalische Konfiguration, nämlich eine Ekman-Strömung über einer glatten Wand, bei der bekanntlich jenseits einer bestimmten Stabilität eine globale Intermittenz auftritt. Vergleiche zwischen beiden Regimen werden mit Hilfe kohärenter Strukturen, insbesondere ihrer Geometrie, durchgeführt. Wurde die von Robinson (Dissertation, Stanford 1991) eingeführte Klassifizierung von Grenzschichtstrukturen erwendet, die im Folgenden als Robinson-Strukturen bezeichnet werden, um die ... |
format |
Text |
author |
Paraswarar Harikrishnan, Abhishek |
author_facet |
Paraswarar Harikrishnan, Abhishek |
author_sort |
Paraswarar Harikrishnan, Abhishek |
title |
Geometry and dynamics of coherent structures in the stably stratified atmospheric boundary layer ... |
title_short |
Geometry and dynamics of coherent structures in the stably stratified atmospheric boundary layer ... |
title_full |
Geometry and dynamics of coherent structures in the stably stratified atmospheric boundary layer ... |
title_fullStr |
Geometry and dynamics of coherent structures in the stably stratified atmospheric boundary layer ... |
title_full_unstemmed |
Geometry and dynamics of coherent structures in the stably stratified atmospheric boundary layer ... |
title_sort |
geometry and dynamics of coherent structures in the stably stratified atmospheric boundary layer ... |
publisher |
Freie Universität Berlin |
publishDate |
2023 |
url |
https://dx.doi.org/10.17169/refubium-43180 https://refubium.fu-berlin.de/handle/fub188/43463 |
geographic |
Arctic |
geographic_facet |
Arctic |
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Arctic |
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Arctic |
op_rights |
http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen |
op_doi |
https://doi.org/10.17169/refubium-43180 |
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1809897248547405824 |