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Comparison of large-scale amplitude modulation in turbulent boundary layers, pipes and channel flows

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2009
auteur(s) Mathis Romain; Monty Jason Patrick; Hutchins Nicholas; Marusic Ivan
journal (abréviation) Physics of Fluids (Phys. Fluids)
volume (numéro) 21 (11)
numéro de papier 111703
  
résumé Recent investigations by Monty et al. [J. Fluid Mech. 632, 431 (2009)] showed that important modal differences exist between channels/pipes and boundary layers, mainly in the largest energetic scales. In addition, Mathis et al. [J. Fluid Mech. 628, 311 (2009)] recently reported and quantified a nonlinear scale interaction in zero-pressure gradient turbulent boundary layers, whereby the large-scale motion amplitude modulates the small-scale motions. In this study, a comparison of this modulation effect of the streamwise velocity component is undertaken for all three flows for matched Reynolds number and measurement conditions. Despite the different large-scale phenomena in these internal and external wall-bounded flows, the results show that their amplitude modulation influence remains invariant in the inner region with some differences appearing in the outer region.
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