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Flow visualization of superbursts and of the log-layer in a DNS at $$Re_{\tau} = 950$$. (English) Zbl 1201.76092
Summary: This paper uses direct numerical simulations (DNS) of turbulent flow in a channel at $$Re_{\tau} = 950$$ [J. C. del Álamo, J. Jiménez, P. Zandonade and R. D. Moser, J. Fluid Mech. 500, 135-144 (2004; Zbl 1059.76031)] to provide a picture of the turbulent structures making large contributions to the Reynolds shear stress. Considerable work of this type has been done for the viscous wall region at smaller $$Re _{\tau }$$, for which a log-layer does not exist. Recent PIV measurements of turbulent velocity fluctuations in a plane parallel to the direction of flow have emphasized the dominant contribution of large scale structures in the outer flow. This prompted T. J. Hanratty and D. V. Papavassiliou [In Panton, R.L. (ed), Self-sustaining Mechanism of Wall Turbulence. Computational Mechanics Publications, Southampton, 83–108 (1997)] to use DNS at $$Re_{\tau } = 150,300$$ to examine these structures in a plane perpendicular to the direction of flow. They identified plumes which extend from the wall to the center of a channel. The data at $$Re_{\tau } = 950$$ are used to explore these results further, to examine the structure of the log-layer, and to test present notions about the viscous wall layer.

##### MSC:
 76F65 Direct numerical and large eddy simulation of turbulence 76M27 Visualization algorithms applied to problems in fluid mechanics
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