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Streamwise inclination angle of large wall-attached structures in turbulent boundary layers. (English) Zbl 1430.76264

Summary: The streamwise inclination angle of large wall-attached structures, in the log region of a canonical turbulent boundary layer, is estimated via spectral coherence analysis, and is found to be approximately \(45^\circ \). This is consistent with assumptions used in prior attached eddy model-based simulations. Given that the inclination angle obtained via standard two-point correlations is influenced by the range of scales in the turbulent flow [I. Marusic, Phys. Fluids 13, No. 3, Paper No. 735, 9 p. (2001; Zbl 1184.76351)], the present result is obtained by isolating the large wall-attached structures from the rest of the turbulence. This is achieved by introducing a spanwise offset between two hot-wire probes, synchronously measuring the streamwise velocity at a near-wall and log-region reference location, to assess the wall coherence. The methodology is shown to be effective by applying it to data sets across Reynolds numbers, \(Re_\tau\sim O(10^3)-O(10^6)\).

MSC:

76F40 Turbulent boundary layers
76F10 Shear flows and turbulence

Citations:

Zbl 1184.76351
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Full Text: DOI

References:

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