Abstract The paper describes the energy fluxes simultaneously occurring in the space of scales and in the physical space of wall-turbulent flows. The unexpected behaviour of the energy fluxes consists of spiral-like paths in the combined physical/scale space where the controversial reverse energy cascade plays a central role. Two dynamical processes are identified as driving mechanisms for the fluxes, one in the near-wall region and a second one further away from the wall. The former, stronger, one is related to the dynamics involved in the near-wall turbulence regeneration cycle. The second suggests an outer self-sustaining mechanism which is asymptotically expected to take place in the eventual log layer and could explain the debated mixed inner/outer scaling of the near-wall statistics. The observed behaviour may have strong repercussions on both theoretical and modelling approaches to wall turbulence, as anticipated by a simple equation which is shown able to capture most of the rich dynamics of the shear-dominated region of the flow. © Cambridge University Press 2013.

Paths of energy in turbulent channel flows / Cimarelli, A.; De Angelis, E.; Casciola, C. M.. - In: JOURNAL OF FLUID MECHANICS. - ISSN 0022-1120. - 715:(2013), pp. 436-451. [10.1017/jfm.2012.528]

Paths of energy in turbulent channel flows

Cimarelli A.;
2013

Abstract

Abstract The paper describes the energy fluxes simultaneously occurring in the space of scales and in the physical space of wall-turbulent flows. The unexpected behaviour of the energy fluxes consists of spiral-like paths in the combined physical/scale space where the controversial reverse energy cascade plays a central role. Two dynamical processes are identified as driving mechanisms for the fluxes, one in the near-wall region and a second one further away from the wall. The former, stronger, one is related to the dynamics involved in the near-wall turbulence regeneration cycle. The second suggests an outer self-sustaining mechanism which is asymptotically expected to take place in the eventual log layer and could explain the debated mixed inner/outer scaling of the near-wall statistics. The observed behaviour may have strong repercussions on both theoretical and modelling approaches to wall turbulence, as anticipated by a simple equation which is shown able to capture most of the rich dynamics of the shear-dominated region of the flow. © Cambridge University Press 2013.
2013
715
436
451
Paths of energy in turbulent channel flows / Cimarelli, A.; De Angelis, E.; Casciola, C. M.. - In: JOURNAL OF FLUID MECHANICS. - ISSN 0022-1120. - 715:(2013), pp. 436-451. [10.1017/jfm.2012.528]
Cimarelli, A.; De Angelis, E.; Casciola, C. M.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1190015
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