Quantifying the interaction between large and small scales in wall-bounded turbulent flows: A note of caution

Schlatter P, Orlu R (2010)


Publication Type: Journal article

Publication year: 2010

Journal

Book Volume: 22

Pages Range: 1-4

Article Number: 032005PHF

Journal Issue: 5

DOI: 10.1063/1.3432488

Abstract

Turbulent flow close to solid walls is dominated by an ensemble of fluctuations of large and small spatial scales. Recent work by Mathis et al. [J. Fluid Mech.628, 311 (2009); Phys. Fluids21, 111703 (2009)] introduced and used a decoupling procedure based on the Hilbert transformation applied to the filtered small-scale component of the fluctuating streamwise velocity. This method is employed as a robust tool to quantify a dominant amplitude modulation of the small scales by the large scales found in the outer part of the boundary layer. In the present study, however, we demonstrate by means of experimental and synthetic signals that the correlation coefficient used to quantify the amplitude modulation is related to the skewness of the original signal, and hence, for the Reynolds numbers considered here, may not be an independent tool to unambiguously detect or quantify the effect of large-scale amplitude modulation of the small scales. © 2010 American Institute of Physics.

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APA:

Schlatter, P., & Orlu, R. (2010). Quantifying the interaction between large and small scales in wall-bounded turbulent flows: A note of caution. Physics of Fluids, 22(5), 1-4. https://dx.doi.org/10.1063/1.3432488

MLA:

Schlatter, Philipp, and Ramis Orlu. "Quantifying the interaction between large and small scales in wall-bounded turbulent flows: A note of caution." Physics of Fluids 22.5 (2010): 1-4.

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