Changes in integral power budgets and scale energy fluxes as induced by certain active flow control strategies for turbulent skin-friction drag reduction are studied by performing Direct Numerical Simulation of turbulent channels. The innovative feature of the present study is that the flow is driven at Constant total Power Input (CtPI), which is a necessary enabling choice in order to meaningfully compare a reference unmanipulated flow with a modified one from the energetic standpoint. Spanwise wall oscillation and opposition control are adopted as model strategies, because of their very different control input power requirements. The global power budget show that the increase of dissipation of mean kinetic energy is not always related to drag reduction, while the preliminary analysis of the scale energy fluxes through the generalized Kolmogorov equation shows that the space-and scale properties of the scale energy source and fluxes are significantly modified in the near-wall region, while remain unaltered elsewhere.
Study of energetics in drag-reduced turbulent channel flows / Gatti, D.; Quadrio, M.; Cimarelli, A.; Hasegawa, Y.; Frohnapfel, B.. - 196(2017), pp. 219-225.
Data di pubblicazione: | 2017 |
Titolo: | Study of energetics in drag-reduced turbulent channel flows |
Autore/i: | Gatti, D.; Quadrio, M.; Cimarelli, A.; Hasegawa, Y.; Frohnapfel, B. |
Autore/i UNIMORE: | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1007/978-3-319-57934-4_31 |
Codice identificativo Scopus: | 2-s2.0-85022345327 |
Codice identificativo ISI: | WOS:000452520700031 |
Serie: | SPRINGER PROCEEDINGS IN PHYSICS |
Titolo del libro: | Springer Proceedings in Physics |
ISBN: | 978-3-319-57933-7 978-3-319-57934-4 |
Editore: | Springer Science and Business Media, LLC |
Citazione: | Study of energetics in drag-reduced turbulent channel flows / Gatti, D.; Quadrio, M.; Cimarelli, A.; Hasegawa, Y.; Frohnapfel, B.. - 196(2017), pp. 219-225. |
Tipologia | Capitolo/Saggio |
File in questo prodotto:

I documenti presenti in Iris Unimore sono rilasciati con licenza Creative Commons Attribuzione - Non commerciale - Non opere derivate 3.0 Italia, salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris