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The quiescent core of turbulent channel flow

Kwon, Y. S. ; Philip, J. ; de Silva, C. M. ; Hutchins, N. ; Monty, J. P.

Journal of fluid mechanics, 2014-07, Vol.751, p.228-254 [Periódico revisado por pares]

Cambridge, UK: Cambridge University Press

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  • Título:
    The quiescent core of turbulent channel flow
  • Autor: Kwon, Y. S. ; Philip, J. ; de Silva, C. M. ; Hutchins, N. ; Monty, J. P.
  • Assuntos: Boundary layer ; Boundary layer and shear turbulence ; Exact sciences and technology ; Fluid dynamics ; Fluid mechanics ; Fundamental areas of phenomenology (including applications) ; Instrumentation for fluid dynamics ; Physics ; Turbulence ; Turbulent flows, convection, and heat transfer
  • É parte de: Journal of fluid mechanics, 2014-07, Vol.751, p.228-254
  • Descrição: The identification of uniform momentum zones in wall-turbulence, introduced by Adrian, Meinhart & Tomkins (J. Fluid Mech., vol. 422, 2000, pp. 1–54) has been applied to turbulent channel flow, revealing a large ‘core’ region having high and uniform velocity magnitude. Examination of the core reveals that it is a region of relatively weak turbulence levels. For channel flow in the range $\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq =\leqslant \let \ge =\geqslant \let \geq =\geqslant \def \Pr {\mathit {Pr}}\def \Fr {\mathit {Fr}}\def \Rey {\mathit {Re}}Re_{\tau } = 1000\text {--}4000$ , it was found that the ‘core’ is identifiable by regions bounded by the continuous isocontour lines of the streamwise velocity at $0.95U_{CL}$ (95 % of the centreline velocity). A detailed investigation into the properties of the core has revealed it has a large-scale oscillation which is predominantly anti-symmetric with respect to the channel centreline as it moves through the channel, and there is a distinct jump in turbulence statistics as the core boundary is crossed. It is concluded that the edge of the core demarcates a shear layer of relatively intense vorticity such that the interior of the core contains weakly varying, very low-level turbulence (relative to the flow closer to the wall). Although channel flows are generally referred to as ‘fully turbulent’, these findings suggest there exists a relatively large and ‘quiescent’ core region with a boundary qualitatively similar to the turbulent/non-turbulent interface of boundary layers, jets and wakes.
  • Editor: Cambridge, UK: Cambridge University Press
  • Idioma: Inglês
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