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 $S_w \approx 0.1\unicode{x2013}0.16$, 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.
The vertical-velocity skewness in the inertial sublayer of turbulent wall flows / Buono, E.; Katul, G.; Heisel, M.; Vettori, D.; Poggi, D.; Peruzzi, C.; Manes, C.. - In: JOURNAL OF FLUID MECHANICS. - ISSN 1469-7645. - 1001:(2024). [10.1017/jfm.2024.975]
The vertical-velocity skewness in the inertial sublayer of turbulent wall flows
Buono E.;Katul G.;Vettori D.;Poggi D.;Peruzzi C.;Manes C.
2024
Abstract
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 $S_w \approx 0.1\unicode{x2013}0.16$, 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.File | Dimensione | Formato | |
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https://hdl.handle.net/11583/2996322