Vertical dispersion of Lagrangian tracers in fully developed stably stratified turbulence

We study the effect of different forcing functions and of the local gradient Richardson number Rig on the vertical transport of Lagrangian tracers in stably stratified turbulence under the Boussinesq approximation and present a wave and continuous-time random-walk model for single- and two-particle...

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Autores principales: Sujovolsky, N.E., Mininni, P.D.
Formato: JOUR
Materias:
Continuous time systems
Elementary particle sources
Lagrange multipliers
Random processes
Turbulence
Boussinesq approximations
Continuous-time random walk models
Homogeneous and isotropic
Random walk process
Stratified turbulence
Turbulent dispersion
Vertical dispersion
Vertical transports
Dispersion (waves)
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_2469990X_v4_n1_p_Sujovolsky
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_2469990X_v4_n1_p_Sujovolsky2023-10-03T16:41:27Z Vertical dispersion of Lagrangian tracers in fully developed stably stratified turbulence Sujovolsky, N.E. Mininni, P.D. Continuous time systems Elementary particle sources Lagrange multipliers Random processes Turbulence Boussinesq approximations Continuous-time random walk models Homogeneous and isotropic Random walk process Stratified turbulence Turbulent dispersion Vertical dispersion Vertical transports Dispersion (waves) We study the effect of different forcing functions and of the local gradient Richardson number Rig on the vertical transport of Lagrangian tracers in stably stratified turbulence under the Boussinesq approximation and present a wave and continuous-time random-walk model for single- and two-particle vertical dispersion. The model consists of a random superposition of linear waves with their amplitude, based on the observed Lagrangian spectrum of vertical velocity, and a random-walk process to capture overturning that depends on the statistics of Rig among other Eulerian quantities. The model is in good agreement with direct numerical simulations of stratified turbulence, where single- and two-particle dispersion differ from the homogeneous and isotropic case. Moreover, the model gives insight into the mixture of linear and nonlinear physics in the problem, as well as on the different processes responsible for vertical turbulent dispersion. © 2019 American Physical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_2469990X_v4_n1_p_Sujovolsky
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Continuous time systems
Elementary particle sources
Lagrange multipliers
Random processes
Turbulence
Boussinesq approximations
Continuous-time random walk models
Homogeneous and isotropic
Random walk process
Stratified turbulence
Turbulent dispersion
Vertical dispersion
Vertical transports
Dispersion (waves)
spellingShingle Continuous time systems
Elementary particle sources
Lagrange multipliers
Random processes
Turbulence
Boussinesq approximations
Continuous-time random walk models
Homogeneous and isotropic
Random walk process
Stratified turbulence
Turbulent dispersion
Vertical dispersion
Vertical transports
Dispersion (waves)
Sujovolsky, N.E.
Mininni, P.D.
Vertical dispersion of Lagrangian tracers in fully developed stably stratified turbulence
topic_facet Continuous time systems
Elementary particle sources
Lagrange multipliers
Random processes
Turbulence
Boussinesq approximations
Continuous-time random walk models
Homogeneous and isotropic
Random walk process
Stratified turbulence
Turbulent dispersion
Vertical dispersion
Vertical transports
Dispersion (waves)
description We study the effect of different forcing functions and of the local gradient Richardson number Rig on the vertical transport of Lagrangian tracers in stably stratified turbulence under the Boussinesq approximation and present a wave and continuous-time random-walk model for single- and two-particle vertical dispersion. The model consists of a random superposition of linear waves with their amplitude, based on the observed Lagrangian spectrum of vertical velocity, and a random-walk process to capture overturning that depends on the statistics of Rig among other Eulerian quantities. The model is in good agreement with direct numerical simulations of stratified turbulence, where single- and two-particle dispersion differ from the homogeneous and isotropic case. Moreover, the model gives insight into the mixture of linear and nonlinear physics in the problem, as well as on the different processes responsible for vertical turbulent dispersion. © 2019 American Physical Society.
format JOUR
author Sujovolsky, N.E.
Mininni, P.D.
author_facet Sujovolsky, N.E.
Mininni, P.D.
author_sort Sujovolsky, N.E.
title Vertical dispersion of Lagrangian tracers in fully developed stably stratified turbulence
title_short Vertical dispersion of Lagrangian tracers in fully developed stably stratified turbulence
title_full Vertical dispersion of Lagrangian tracers in fully developed stably stratified turbulence
title_fullStr Vertical dispersion of Lagrangian tracers in fully developed stably stratified turbulence
title_full_unstemmed Vertical dispersion of Lagrangian tracers in fully developed stably stratified turbulence
title_sort vertical dispersion of lagrangian tracers in fully developed stably stratified turbulence
url http://hdl.handle.net/20.500.12110/paper_2469990X_v4_n1_p_Sujovolsky
work_keys_str_mv AT sujovolskyne verticaldispersionoflagrangiantracersinfullydevelopedstablystratifiedturbulence
AT mininnipd verticaldispersionoflagrangiantracersinfullydevelopedstablystratifiedturbulence
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