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Interactions within the turbulent boundary layer at high Reynolds number. (English) Zbl 1225.76015
Summary: Simultaneous streamwise velocity measurements across the vertical direction obtained in the atmospheric surface layer $$(Re_{\tau} \simeq 5\times 10^{5})$$ under near thermally neutral conditions are used to outline and quantify interactions between the scales of turbulence, from the very-large-scale motions to the dissipative scales. Results from conditioned spectra, joint probability density functions and conditional averages show that the signature of very-large-scale oscillations can be found across the whole wall region and that these scales interact with the near-wall turbulence from the energy-containing eddies to the dissipative scales, most strongly in a layer close to the wall, $$z^{+} \lesssim 10^{3}$$. The scale separation achievable in the atmospheric surface layer appears to be a key difference from the low-Reynolds-number picture, in which structures attached to the wall are known to extend through the full wall-normal extent of the boundary layer. A phenomenological picture of very-large-scale motions coexisting and interacting with structures from the hairpin paradigm is provided here for the high-Reynolds-number case. In particular, it is inferred that the hairpin-packet conceptual model may not be exhaustively representative of the whole wall region, but only of a near-wall layer of $$z^{+} = O(10^{3})$$, where scale interactions are mostly confined.

##### MSC:
 76-05 Experimental work for problems pertaining to fluid mechanics 76F40 Turbulent boundary layers 86A10 Meteorology and atmospheric physics
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