Spectrum of a passive scalar in moderate Reynolds number homogeneous isotropic turbulence
For moderate Reynolds numbers, the spectral scaling exponents of both velocity [E(k)k−mu] and the transported passive scalar [E(k)k−m] fields exhibit departures from the asymptotic predict...
For moderate Reynolds numbers, the spectral scaling exponents of both velocity [E(k)k−mu] and the transported passive scalar [E(k)k−m] fields exhibit departures from the asymptotic predict...
Experimental vortex breakdown topology in a cylinder with a free surface
The free surface flow in a circular cylinder driven by a rotating bottom disk is studied experimentally using particle image velocimetry. Results are compared with computational results assuming a str...
The free surface flow in a circular cylinder driven by a rotating bottom disk is studied experimentally using particle image velocimetry. Results are compared with computational results assuming a str...
Comparison of large-scale amplitude modulation in turbulent boundary layers, pipes, and channel flows
Phys. Fluids 21, 111703 (2009); doi:10.1063/1.3267726
Published 24 November 2009
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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.
©2009 American Institute of Physics
| History: | Received 16 August 2009; accepted 26 October 2009; published 24 November 2009 |
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REFERENCES (20)
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