The vertical-velocity skewness in the inertial sublayer of turbulent wall flows

Buono, Elia; Katul, Gabriel; Heisel, Michael; Vettori, Davide; Poggi, Davide; Peruzzi, Cosimo; Manes, Costantino

doi:10.1017/jfm.2024.975

The vertical-velocity skewness in the inertial sublayer of turbulent wall flows

Journal Article · Wed Dec 18 00:00:00 EST 2024 · Journal of Fluid Mechanics

DOI:https://doi.org/10.1017/jfm.2024.975· OSTI ID:3006759

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Duke Univ., Durham, NC (United States); Polytechnic Univ. of Turin (United States)
Duke Univ., Durham, NC (United States)
Univ. of Sydney, NSW (Australia)
Polytechnic Univ. of Turin (United States)
Italian Institute for Environmental Protection and Research, Rome (Italy)

Empirical evidence is provided that within the inertial sublayer (i.e. logarithmic region) of adiabatic turbulent flows over smooth walls, the skewness of the vertical-velocity component 𝑆_𝑤 displays universal behaviour, being a positive constant and constrained within the range 𝑆_𝑤 ≈ 0.1–0.16, regardless of flow configuration and Reynolds number. A theoretical model is then proposed to explain this behaviour, including the observed range of variations of 𝑆_𝑤. The proposed model clarifies why 𝑆_𝑤 cannot be predicted from down-gradient closure approximations routinely employed in large-scale meteorological and climate models. The proposed model also offers an alternative and implementable approach for such large-scale models.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: SC0022072

OSTI ID:: 3006759

Journal Information:: Journal of Fluid Mechanics, Journal Name: Journal of Fluid Mechanics Vol. 1001; ISSN 1469-7645; ISSN 0022-1120

Publisher:: Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

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