Non-Gaussian buoyancy statistics in fingering convection

Jost von Hardenberg; Francesco Paparella

doi:10.1016/j.physleta.2010.04.051

Non-Gaussian buoyancy statistics in fingering convection

Jost von Hardenberg, Francesco Paparella

Mathematics

Research output: Contribution to journal › Article › peer-review

Abstract

We examine the statistics of active scalar fluctuations in high-Rayleigh number fingering convection with high-resolution three-dimensional numerical experiments. Marked non-Gaussian tails are found in the one-point distribution of buoyancy fluctuations. A modified theory based on an original approach by Yakhot (1989) is used to model the active scalar distributions as a function of the conditional expectation values of scalar dissipation and fluxes in the flow. Simple models for these two quantities highlight the role of blob-like coherent structures for scalar statistics in fingering convection.

Original language	English (US)
Pages (from-to)	2646-2653
Number of pages	8
Journal	Physics Letters, Section A: General, Atomic and Solid State Physics
Volume	374
Issue number	26
DOIs	https://doi.org/10.1016/j.physleta.2010.04.051
State	Published - Jun 7 2010

Keywords

Doubly-diffusive convection
Salt fingers

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1016/j.physleta.2010.04.051

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title = "Non-Gaussian buoyancy statistics in fingering convection",

abstract = "We examine the statistics of active scalar fluctuations in high-Rayleigh number fingering convection with high-resolution three-dimensional numerical experiments. Marked non-Gaussian tails are found in the one-point distribution of buoyancy fluctuations. A modified theory based on an original approach by Yakhot (1989) is used to model the active scalar distributions as a function of the conditional expectation values of scalar dissipation and fluxes in the flow. Simple models for these two quantities highlight the role of blob-like coherent structures for scalar statistics in fingering convection.",

keywords = "Doubly-diffusive convection, Salt fingers",

author = "{von Hardenberg}, Jost and Francesco Paparella",

note = "Funding Information: The authors acknowledge support from CASPUR, Roma, Italy , where the three-dimensional computer simulations where carried out (HPC Standard Grant 2009).",

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AU - von Hardenberg, Jost

AU - Paparella, Francesco

N1 - Funding Information: The authors acknowledge support from CASPUR, Roma, Italy , where the three-dimensional computer simulations where carried out (HPC Standard Grant 2009).

PY - 2010/6/7

Y1 - 2010/6/7

N2 - We examine the statistics of active scalar fluctuations in high-Rayleigh number fingering convection with high-resolution three-dimensional numerical experiments. Marked non-Gaussian tails are found in the one-point distribution of buoyancy fluctuations. A modified theory based on an original approach by Yakhot (1989) is used to model the active scalar distributions as a function of the conditional expectation values of scalar dissipation and fluxes in the flow. Simple models for these two quantities highlight the role of blob-like coherent structures for scalar statistics in fingering convection.

AB - We examine the statistics of active scalar fluctuations in high-Rayleigh number fingering convection with high-resolution three-dimensional numerical experiments. Marked non-Gaussian tails are found in the one-point distribution of buoyancy fluctuations. A modified theory based on an original approach by Yakhot (1989) is used to model the active scalar distributions as a function of the conditional expectation values of scalar dissipation and fluxes in the flow. Simple models for these two quantities highlight the role of blob-like coherent structures for scalar statistics in fingering convection.

KW - Doubly-diffusive convection

KW - Salt fingers

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EP - 2653

JO - Physics Letters, Section A: General, Atomic and Solid State Physics

JF - Physics Letters, Section A: General, Atomic and Solid State Physics

IS - 26

ER -

Non-Gaussian buoyancy statistics in fingering convection

Abstract

Keywords

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