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Phase relationships between large and small scales in the turbulent boundary layer

Jacobi, I. and McKeon, B. J. (2013) Phase relationships between large and small scales in the turbulent boundary layer. Experiments in Fluids, 54 (3). Art. No. 1481. ISSN 0723-4864. https://resolver.caltech.edu/CaltechAUTHORS:20130605-100354415

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Abstract

The apparent amplitude modulation effect between large- and small-scale motions in the turbulent boundary layer, including both streamwise and wall-normal velocity components, is explored by cross-correlation techniques. Single-point hotwire and planar PIV measurements are employed to consider the envelopes of small-scale fluctuations in both directions and their correlation with the fluctuations of large-scale motions in the streamwise direction. The degree of correlation is interpreted as a measure of phase lag between the different scale motions, and these phase measurements are used to demonstrate that the fluctuations in the envelope of small-scale motions in both directions tend to lead corresponding fluctuations in the large scales in the streamwise direction. The cospectral density of the cross-correlation between the different scales is used to identify the particular large-scale motions dominant in the modulation effect, and it is shown that the dominant interacting (or ‘modulating’) scale corresponds in size to the very large-scale motions observed in internal flows but not normally observed in the outer region of the boundary layer.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1007/s00348-013-1481-yDOIUNSPECIFIED
http://link.springer.com/article/10.1007/s00348-013-1481-yPublisherUNSPECIFIED
ORCID:
AuthorORCID
McKeon, B. J.0000-0003-4220-1583
Additional Information:© 2013 Springer-Verlag Berlin Heidelberg. Received: 16 November 2012. Revised: 6 February 2013. Accepted: 8 February 2013. Published online: 27 February 2013. This work was supported by the Air Force Office of Scientific Research Hypersonics and Turbulence portfolio, under grant #FA9550-09-1-0701 (Program Manager John Schmisseur).
Group:GALCIT
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research Hypersonics and Turbulence portfolioFA9550-09-1-0701
Issue or Number:3
Record Number:CaltechAUTHORS:20130605-100354415
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130605-100354415
Official Citation: Phase relationships between large and small scales in the turbulent boundary layer I. Jacobi, B. J. McKeon Article 1481
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38807
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:05 Jun 2013 17:21
Last Modified:03 Oct 2019 05:00

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