Thermoconvective instabilities to explain the main characteristics of a dust devil-like vortex

In this paper we show numerically that the main characteristics of a dust devil-like vortex: vertical vorticity generation, eye formation, and tilting of the eye/axis of rotation, can be explained by thermoconvective mechanisms. By considering a cylinder non-homogeneously heated from below we prove...

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Detalles Bibliográficos
Autores: Navarro Lérida, María Cruz, Castaño Torrijos, Damián, Herrero Sanz, Henar
Tipo de recurso: artículo
Fecha de publicación:2015
País:España
Institución:Universidad de Castilla-La Mancha
Repositorio:RUIdeRA. Repositorio Institucional de la UCLM
OAI Identifier:oai:ruidera.uclm.es:10578/40293
Acceso en línea:https://hdl.handle.net/10578/40293
Access Level:acceso abierto
Palabra clave:Navier–Stokes equations
Spectral methods
Thermoconvective instabilities
Vortex generation
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spelling Thermoconvective instabilities to explain the main characteristics of a dust devil-like vortexNavarro Lérida, María CruzCastaño Torrijos, DamiánHerrero Sanz, HenarNavier–Stokes equationsSpectral methodsThermoconvective instabilitiesVortex generationIn this paper we show numerically that the main characteristics of a dust devil-like vortex: vertical vorticity generation, eye formation, and tilting of the eye/axis of rotation, can be explained by thermoconvective mechanisms. By considering a cylinder non-homogeneously heated from below we prove that an intense localized heating on the ground generates a convective stationary axisymmetric flow that begins to spiral up around a central axis when perturbation vertical vorticity is permitted and a critical vertical temperature gradient is exceeded, thus forming an axisymmetric vortex. If the intense heating on the ground is not too localized and the temperature gradient continues increasing, central downdrafts appear in the vortex and an eye is formed. We show that the axisymmetric vortex loses stability towards a new state for which the axisymmetry is broken, the axis of rotation or proper eye displaces from the center and tilts. The vortical states found are comparable to dust devils. These findings establish the relevance of thermoconvection on the formation and evolution of these atmospheric phenomena.Elsevier202520252015info:eu-repo/semantics/articleapplication/pdfapplication/pdfhttps://hdl.handle.net/10578/40293reponame:RUIdeRA. Repositorio Institucional de la UCLMinstname:Universidad de Castilla-La ManchaInglésinfo:eu-repo/semantics/openAccessoai:ruidera.uclm.es:10578/402932026-05-27T07:36:41Z
dc.title.none.fl_str_mv Thermoconvective instabilities to explain the main characteristics of a dust devil-like vortex
title Thermoconvective instabilities to explain the main characteristics of a dust devil-like vortex
spellingShingle Thermoconvective instabilities to explain the main characteristics of a dust devil-like vortex
Navarro Lérida, María Cruz
Navier–Stokes equations
Spectral methods
Thermoconvective instabilities
Vortex generation
title_short Thermoconvective instabilities to explain the main characteristics of a dust devil-like vortex
title_full Thermoconvective instabilities to explain the main characteristics of a dust devil-like vortex
title_fullStr Thermoconvective instabilities to explain the main characteristics of a dust devil-like vortex
title_full_unstemmed Thermoconvective instabilities to explain the main characteristics of a dust devil-like vortex
title_sort Thermoconvective instabilities to explain the main characteristics of a dust devil-like vortex
dc.creator.none.fl_str_mv Navarro Lérida, María Cruz
Castaño Torrijos, Damián
Herrero Sanz, Henar
author Navarro Lérida, María Cruz
author_facet Navarro Lérida, María Cruz
Castaño Torrijos, Damián
Herrero Sanz, Henar
author_role author
author2 Castaño Torrijos, Damián
Herrero Sanz, Henar
author2_role author
author
dc.subject.none.fl_str_mv Navier–Stokes equations
Spectral methods
Thermoconvective instabilities
Vortex generation
topic Navier–Stokes equations
Spectral methods
Thermoconvective instabilities
Vortex generation
description In this paper we show numerically that the main characteristics of a dust devil-like vortex: vertical vorticity generation, eye formation, and tilting of the eye/axis of rotation, can be explained by thermoconvective mechanisms. By considering a cylinder non-homogeneously heated from below we prove that an intense localized heating on the ground generates a convective stationary axisymmetric flow that begins to spiral up around a central axis when perturbation vertical vorticity is permitted and a critical vertical temperature gradient is exceeded, thus forming an axisymmetric vortex. If the intense heating on the ground is not too localized and the temperature gradient continues increasing, central downdrafts appear in the vortex and an eye is formed. We show that the axisymmetric vortex loses stability towards a new state for which the axisymmetry is broken, the axis of rotation or proper eye displaces from the center and tilts. The vortical states found are comparable to dust devils. These findings establish the relevance of thermoconvection on the formation and evolution of these atmospheric phenomena.
publishDate 2015
dc.date.none.fl_str_mv 2015
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/10578/40293
url https://hdl.handle.net/10578/40293
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:RUIdeRA. Repositorio Institucional de la UCLM
instname:Universidad de Castilla-La Mancha
instname_str Universidad de Castilla-La Mancha
reponame_str RUIdeRA. Repositorio Institucional de la UCLM
collection RUIdeRA. Repositorio Institucional de la UCLM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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