Conditional statistics of temperature fluctuations in turbulent convection

Details Conditional statistics of temperature fluctuations in turbulent convection Conditional statistics of temperature fluctuations in turbulent convection

2001-01-06

arxiv.org/abs/cond-mat/0101071v1

Physics

Condensed Matter

Statistical Mechanics

5 pages, 5 figures. accepted for publication in Physical Review E. accepted for publication in Physical Review E

Scientific paper

10.1103/PhysRevE.63.047303

We find that the conditional statistics of temperature difference at fixed values of the locally averaged temperature dissipation rate in turbulent convection become Gaussian in the regime where the mixing dynamics is expected to be driven by buoyancy. Hence, intermittency of the temperature fluctuations in this buoyancy-driven regime can be solely attributed to the variation of the locally averaged temperature dissipation rate. We further obtain the functional behavior of these conditional temperature structure functions. This functional form demonstrates explicitly the failure of dimensional agruments and enhances the understanding of the temperature structure functions.

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