By means of the multidimensional description given by the Kolmogorov equation we study the energy transfer physics and the production mechanisms of wall-turbulent flows at moderately high Reynolds numbers. Two driving mechanisms are identified for the energy fluxes. The first stronger one, here called driving scale-range (DSR), belongs to the near-wall cycle. As expected, its topology remains unaltered with Reynolds number while its intensity is found to slightly increase with Re. The second mechanism, here called outer scale-range (OSR), takes place in the overlap layer and highlights different features in agreement with the attached eddies hypothesis usually considered to describe the overlap dynamics.
Scalings of the outer energy source of wall-turbulence / Cimarelli, A.; de Angelis, E.; Schlatter, P.; Brethouwer, G.; Talamelli, A.; Casciola, C. M.. - (2020). (Intervento presentato al convegno 14th European Turbulence Conference, ETC 2013 tenutosi a Ecole Normale Superieure de Lyon, fra nel 2013).
Scalings of the outer energy source of wall-turbulence
Cimarelli A.
;Talamelli A.;
2020
Abstract
By means of the multidimensional description given by the Kolmogorov equation we study the energy transfer physics and the production mechanisms of wall-turbulent flows at moderately high Reynolds numbers. Two driving mechanisms are identified for the energy fluxes. The first stronger one, here called driving scale-range (DSR), belongs to the near-wall cycle. As expected, its topology remains unaltered with Reynolds number while its intensity is found to slightly increase with Re. The second mechanism, here called outer scale-range (OSR), takes place in the overlap layer and highlights different features in agreement with the attached eddies hypothesis usually considered to describe the overlap dynamics.
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