“Clusterization” and intermittency of temperature fluctuations in turbulent convection

A. Bershadskii, J. J. Niemela, A. Praskovsky, K. R. Sreenivasan

Research output: Contribution to journalArticle

Abstract

Temperature time traces are obtained in turbulent thermal convection at high Rayleigh numbers. Measurements are made in the midplane of the apparatus, near the sidewall but outside the boundary layer. A telegraph approximation for temperature traces is generated by setting the fluctuation amplitude to 1 or 0 depending on whether or not it exceeds the mean value. Unlike the standard diagnostics of intermittency, the telegraph approximation allows one to distinguish the tendency of events to cluster (clusterization) from their large-scale variability in amplitude. A qualitative conclusion is that amplitude intermittency might mitigate clusterization effects.

Original languageEnglish (US)
Number of pages1
JournalPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume69
Issue number5
DOIs
StatePublished - Jan 1 2004

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Intermittency
intermittency
Convection
convection
Fluctuations
Trace
Thermal Convection
Rayleigh number
Approximation
approximation
free convection
Mean Value
temperature
Boundary Layer
boundary layers
Diagnostics
Exceed
tendencies

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

Cite this

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AU - Bershadskii, A.

AU - Niemela, J. J.

AU - Praskovsky, A.

AU - Sreenivasan, K. R.

PY - 2004/1/1

Y1 - 2004/1/1

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AB - Temperature time traces are obtained in turbulent thermal convection at high Rayleigh numbers. Measurements are made in the midplane of the apparatus, near the sidewall but outside the boundary layer. A telegraph approximation for temperature traces is generated by setting the fluctuation amplitude to 1 or 0 depending on whether or not it exceeds the mean value. Unlike the standard diagnostics of intermittency, the telegraph approximation allows one to distinguish the tendency of events to cluster (clusterization) from their large-scale variability in amplitude. A qualitative conclusion is that amplitude intermittency might mitigate clusterization effects.

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