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Abstract:

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.

Registro:

Documento: Artículo
Título:Vertical dispersion of Lagrangian tracers in fully developed stably stratified turbulence
Autor:Sujovolsky, N.E.; Mininni, P.D.
Filiación:Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, IFIBA, CONICET, Ciudad Universitaria, 1428 Buenos Aires, Buenos Aires, 1428, Argentina
Palabras clave: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)
Año:2019
Volumen:4
Número:1
DOI: http://dx.doi.org/10.1103/PhysRevFluids.4.014503
Título revista:Physical Review Fluids
Título revista abreviado:Phys. Rev. Fluids
ISSN:2469990X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_2469990X_v4_n1_p_Sujovolsky

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Citas:

---------- APA ----------
Sujovolsky, N.E. & Mininni, P.D. (2019) . Vertical dispersion of Lagrangian tracers in fully developed stably stratified turbulence. Physical Review Fluids, 4(1).
http://dx.doi.org/10.1103/PhysRevFluids.4.014503
---------- CHICAGO ----------
Sujovolsky, N.E., Mininni, P.D. "Vertical dispersion of Lagrangian tracers in fully developed stably stratified turbulence" . Physical Review Fluids 4, no. 1 (2019).
http://dx.doi.org/10.1103/PhysRevFluids.4.014503
---------- MLA ----------
Sujovolsky, N.E., Mininni, P.D. "Vertical dispersion of Lagrangian tracers in fully developed stably stratified turbulence" . Physical Review Fluids, vol. 4, no. 1, 2019.
http://dx.doi.org/10.1103/PhysRevFluids.4.014503
---------- VANCOUVER ----------
Sujovolsky, N.E., Mininni, P.D. Vertical dispersion of Lagrangian tracers in fully developed stably stratified turbulence. Phys. Rev. Fluids. 2019;4(1).
http://dx.doi.org/10.1103/PhysRevFluids.4.014503