Journal article
Active and inactive contributions to the wall pressure and wall-shear stress in turbulent boundary layers
Rahul Deshpande, Ricardo Vinuesa, Joseph Klewicki, Ivan Marusic
Journal of Fluid Mechanics | Cambridge University Press | Published : 2025
Abstract
A phenomenological description is presented to explain the intermediate and low-frequency/large-scale contributions to the wall-shear-stress ( ${\tau }_w$ ) and wall-pressure ( $\,{p}_w$ ) spectra of canonical turbulent boundary layers, both of which are well known to increase with Reynolds number, albeit in a distinct manner. The explanation is based on the concept of active and inactive motions (Townsend, J. Fluid Mech., vol. 11, issue 1, 1961, pp. 97–120) associated with the attached-eddy hypothesis. Unique data sets of simultaneously acquired ${\tau }_w$ , ${p}_w$ and velocity-fluctuation time series in the log region are considered, across a friction-Reyn..
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Grants
Awarded by Office of Naval Research
Awarded by European Research Council
Funding Acknowledgements
R.D. is supported by the University of Melbourne's Postdoctoral Fellowship and acknowledges insightful discussions with Drs W.J. Baars, B. Gibeau and S. Ghaemi. Funding is gratefully acknowledged from the Office of Naval Research: N62909-23-1-2068 (R.D., I.M.), and to R.V. from the European Research Council grant no. '2021-CoG-101043998, DEEPCONTROL'. Views/opinions expressed are, however, those of the author(s) only and do not necessarily reflect those of the European Union or the European Research Council. Neither the European Union nor the granting authority can be held responsible for them.