Effective diffusivity of passive scalars in rotating turbulence

We use direct numerical simulations to compute turbulent transport coefficients for passive scalars in turbulent rotating flows. Effective diffusion coefficients in the directions parallel and perpendicular to the rotation axis are obtained by studying the diffusion of an imposed initial profile for...

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Autores principales:	Imazio, P.R., Mininni, P.D.
Formato:	JOUR
Materias:	Average concentration Characteristic velocities Effective diffusion Effective diffusion coefficients Effective diffusivities Function of time Mixing length Molecular diffusion Passive scalars Perpendicular diffusion Rotating flow Rotating turbulence Rotation axis Schmidt numbers Spatial fluxes Turbulent transports Mixed convection Diffusion article computer simulation diffusion flow kinetics methodology nonlinear system rotation theoretical model Computer Simulation Models, Theoretical Nonlinear Dynamics Rheology Rotation
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_15393755_v87_n2_p_Imazio
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_15393755_v87_n2_p_Imazio
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spelling	todo:paper_15393755_v87_n2_p_Imazio2023-10-03T16:22:44Z Effective diffusivity of passive scalars in rotating turbulence Imazio, P.R. Mininni, P.D. Average concentration Characteristic velocities Effective diffusion Effective diffusion coefficients Effective diffusivities Function of time Mixing length Molecular diffusion Passive scalars Perpendicular diffusion Rotating flow Rotating turbulence Rotation axis Schmidt numbers Spatial fluxes Turbulent transports Mixed convection Diffusion article computer simulation diffusion flow kinetics methodology nonlinear system rotation theoretical model Computer Simulation Diffusion Models, Theoretical Nonlinear Dynamics Rheology Rotation We use direct numerical simulations to compute turbulent transport coefficients for passive scalars in turbulent rotating flows. Effective diffusion coefficients in the directions parallel and perpendicular to the rotation axis are obtained by studying the diffusion of an imposed initial profile for the passive scalar, and calculated by measuring the scalar average concentration and average spatial flux as a function of time. The Rossby and Schmidt numbers are varied to quantify their effect on the effective diffusion. It is found that rotation reduces scalar diffusivity in the perpendicular direction. The perpendicular diffusion can be estimated from mixing length arguments using the characteristic velocities and lengths perpendicular to the rotation axis. Deviations are observed for small Schmidt numbers, for which turbulent transport decreases and molecular diffusion becomes more significant. © 2013 American Physical Society. Fil:Mininni, P.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15393755_v87_n2_p_Imazio
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Average concentration Characteristic velocities Effective diffusion Effective diffusion coefficients Effective diffusivities Function of time Mixing length Molecular diffusion Passive scalars Perpendicular diffusion Rotating flow Rotating turbulence Rotation axis Schmidt numbers Spatial fluxes Turbulent transports Mixed convection Diffusion article computer simulation diffusion flow kinetics methodology nonlinear system rotation theoretical model Computer Simulation Diffusion Models, Theoretical Nonlinear Dynamics Rheology Rotation
spellingShingle	Average concentration Characteristic velocities Effective diffusion Effective diffusion coefficients Effective diffusivities Function of time Mixing length Molecular diffusion Passive scalars Perpendicular diffusion Rotating flow Rotating turbulence Rotation axis Schmidt numbers Spatial fluxes Turbulent transports Mixed convection Diffusion article computer simulation diffusion flow kinetics methodology nonlinear system rotation theoretical model Computer Simulation Diffusion Models, Theoretical Nonlinear Dynamics Rheology Rotation Imazio, P.R. Mininni, P.D. Effective diffusivity of passive scalars in rotating turbulence
topic_facet	Average concentration Characteristic velocities Effective diffusion Effective diffusion coefficients Effective diffusivities Function of time Mixing length Molecular diffusion Passive scalars Perpendicular diffusion Rotating flow Rotating turbulence Rotation axis Schmidt numbers Spatial fluxes Turbulent transports Mixed convection Diffusion article computer simulation diffusion flow kinetics methodology nonlinear system rotation theoretical model Computer Simulation Diffusion Models, Theoretical Nonlinear Dynamics Rheology Rotation
description	We use direct numerical simulations to compute turbulent transport coefficients for passive scalars in turbulent rotating flows. Effective diffusion coefficients in the directions parallel and perpendicular to the rotation axis are obtained by studying the diffusion of an imposed initial profile for the passive scalar, and calculated by measuring the scalar average concentration and average spatial flux as a function of time. The Rossby and Schmidt numbers are varied to quantify their effect on the effective diffusion. It is found that rotation reduces scalar diffusivity in the perpendicular direction. The perpendicular diffusion can be estimated from mixing length arguments using the characteristic velocities and lengths perpendicular to the rotation axis. Deviations are observed for small Schmidt numbers, for which turbulent transport decreases and molecular diffusion becomes more significant. © 2013 American Physical Society.
format	JOUR
author	Imazio, P.R. Mininni, P.D.
author_facet	Imazio, P.R. Mininni, P.D.
author_sort	Imazio, P.R.
title	Effective diffusivity of passive scalars in rotating turbulence
title_short	Effective diffusivity of passive scalars in rotating turbulence
title_full	Effective diffusivity of passive scalars in rotating turbulence
title_fullStr	Effective diffusivity of passive scalars in rotating turbulence
title_full_unstemmed	Effective diffusivity of passive scalars in rotating turbulence
title_sort	effective diffusivity of passive scalars in rotating turbulence
url	http://hdl.handle.net/20.500.12110/paper_15393755_v87_n2_p_Imazio
work_keys_str_mv	AT imaziopr effectivediffusivityofpassivescalarsinrotatingturbulence AT mininnipd effectivediffusivityofpassivescalarsinrotatingturbulence
_version_	1807316436130988032

Effective diffusivity of passive scalars in rotating turbulence

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