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- W2057184557 abstract "We present a skewness measurement of the density fluctuations $ensuremath{delta}{stackrel{ifmmode tilde{}else ~{}fi{}}{ensuremath{rho}}}_{l}$ on scales $l$ in a vertical turbulent soap film driven by a temperature gradient. Unlike the temperature difference $ensuremath{delta}{T}_{l}$ in Rayleigh-B'enard convection, the density difference in the film is strongly active because $ensuremath{delta}{stackrel{ifmmode tilde{}else ~{}fi{}}{ensuremath{rho}}}_{l}∕overline{ensuremath{rho}}⪢ensuremath{delta}{T}_{l}∕overline{T}$, where the over-bar indicates the mean. Our results show persistent nonzero skewness ${S}_{y}(l)ensuremath{equiv}⟨ensuremath{delta}{stackrel{ifmmode tilde{}else ~{}fi{}}{ensuremath{rho}}}_{l}^{3}⟩∕{⟨ensuremath{delta}{stackrel{ifmmode tilde{}else ~{}fi{}}{ensuremath{rho}}}_{l}^{2}⟩}^{3∕2}$ on different scales along the gravity direction $stackrel{ifmmode hat{}else ^{}fi{}}{y}$; ${S}_{y}(l)$ is positive for small $l$ and negative for large $l$. The sign switch occurs approximately at the Bolgiano length scale ${l}_{B}$. The simultaneous presence of positive and negative skewnesses is interpreted here as a result of the structures of rising and falling plumes in a strongly stratified medium." @default.
- W2057184557 created "2016-06-24" @default.
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- W2057184557 date "2009-04-08" @default.
- W2057184557 modified "2023-09-27" @default.
- W2057184557 title "Persistent skewness of a strongly active scalar" @default.
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- W2057184557 doi "https://doi.org/10.1103/physreve.79.045301" @default.
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