The vertical-velocity skewness in the inertial sublayer of turbulent wall flows
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.
Authors
- Gabriel G. Katul (ORCID: https://orcid.org/0000-0001-9768-3693)
- Cosimo Peruzzi (ORCID: https://orcid.org/0000-0002-1418-9575)
- Davide Poggi (ORCID: https://orcid.org/0000-0003-0024-3574)
- Michael Heisel (ORCID: https://orcid.org/0000-0002-4200-5550)
- Costantino Manes (ORCID: https://orcid.org/0000-0002-3990-7449)
- Davide Vettori (ORCID: https://orcid.org/0000-0001-5121-4197)
- Elia Buono (ORCID: https://orcid.org/0009-0009-6666-1753)
Institutions
- The University of Sydney (AU)
- Duke University (US)
- Politecnico di Torino (IT)
- Istituto Superiore per la Protezione e la Ricerca Ambientale (IT)
- Institute of Atmospheric Pollution Research (IT)
Publication Details
- Journal
- Journal of Fluid Mechanics
- Published
- 2024-12-18
- DOI
- https://doi.org/10.1017/jfm.2024.975
- Primary Topic
- Fluid Dynamics and Turbulent Flows
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Science Foundation
- U.S. Department of Energy
- Politecnico di Torino
- University of Cambridge
- European Commission
- European Regional Development Fund