The vertical-velocity skewness in the inertial sublayer of turbulent wall flows
We provide empirical evidence that within the inertial sub layer of adiabatic turbulent flows over smooth walls, the skewness of the vertical velocity component $Sk_w$ displays universal behaviour, being constant and constrained within the range $Sk_w \approx 0.1-0.16$, regardless of flow configurat...
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| Main Authors | , , , , , , |
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| Format | Journal Article |
| Language | English |
| Published |
08.07.2024
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| Abstract | We provide empirical evidence that within the inertial sub layer of adiabatic
turbulent flows over smooth walls, the skewness of the vertical velocity
component $Sk_w$ displays universal behaviour, being constant and constrained
within the range $Sk_w \approx 0.1-0.16$, regardless of flow configuration and
Reynolds number. A theoretical model is proposed to explain the observed
behaviour, including the observed range of variations of $Sk_w$. The model
clarifies why $Sk_w$ cannot be predicted from down-gradient closure
approximations routinely employed in meteorological and climate models whereby
$Sk_w$ impacts cloud formation and dispersion processes. The model also offers
an alternative and implementable approach. |
|---|---|
| AbstractList | We provide empirical evidence that within the inertial sub layer of adiabatic
turbulent flows over smooth walls, the skewness of the vertical velocity
component $Sk_w$ displays universal behaviour, being constant and constrained
within the range $Sk_w \approx 0.1-0.16$, regardless of flow configuration and
Reynolds number. A theoretical model is proposed to explain the observed
behaviour, including the observed range of variations of $Sk_w$. The model
clarifies why $Sk_w$ cannot be predicted from down-gradient closure
approximations routinely employed in meteorological and climate models whereby
$Sk_w$ impacts cloud formation and dispersion processes. The model also offers
an alternative and implementable approach. |
| Author | Buono, Elia Poggi, Davide Peruzzi, Cosimo Manes, Costantino Heisel, Michael Vettori, Davide Katul, Gabriel |
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| BackLink | https://doi.org/10.48550/arXiv.2407.05955$$DView paper in arXiv |
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| Snippet | We provide empirical evidence that within the inertial sub layer of adiabatic
turbulent flows over smooth walls, the skewness of the vertical velocity... |
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| SubjectTerms | Physics - Fluid Dynamics |
| Title | The vertical-velocity skewness in the inertial sublayer of turbulent wall flows |
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