Paths of energy in turbulent channel flows
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 pla...
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| Veröffentlicht in: | Journal of fluid mechanics 2013-01, Vol.715, p.436-451 |
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| container_title | Journal of fluid mechanics |
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| creator | Cimarelli, A. De Angelis, E. Casciola, C. M. |
| description | 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. |
| doi_str_mv | 10.1017/jfm.2012.528 |
| format | Article |
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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.</abstract><cop>Cambridge, UK</cop><pub>Cambridge University Press</pub><doi>10.1017/jfm.2012.528</doi><tpages>16</tpages></addata></record> |
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| subjects | Boundary layer Boundary layer and shear turbulence Energy Energy modeling Exact sciences and technology Fluid dynamics Fluid mechanics Fundamental areas of phenomenology (including applications) Physics Turbulence simulation and modeling Turbulent flow Turbulent flows, convection, and heat transfer |
| title | Paths of energy in turbulent channel flows |
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