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Relaminarising pipe flow by wall movement

Published online by Cambridge University Press:  28 March 2019

D. Scarselli Open the ORCID record for D. Scarselli [Opens in a new window] ,
J. Kühnen Open the ORCID record for J. Kühnen [Opens in a new window]  and
B. Hof Open the ORCID record for B. Hof [Opens in a new window]
D. Scarselli*
Affiliation:
Institute of Science and Technology Austria, Am Campus 1, A-3400 Klosterneuburg, Austria
J. Kühnen
Affiliation:
Institute of Science and Technology Austria, Am Campus 1, A-3400 Klosterneuburg, Austria University of Applied Sciences Wiener Neustadt, Johannes Gutenberg-Straße 3, A-2700 Wiener Neustadt, Austria
B. Hof
Affiliation:
Institute of Science and Technology Austria, Am Campus 1, A-3400 Klosterneuburg, Austria
*
†Email address for correspondence: [email protected]
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Abstract

Following the recent observation that turbulent pipe flow can be relaminarised by a relatively simple modification of the mean velocity profile, we here carry out a quantitative experimental investigation of this phenomenon. Our study confirms that a flat velocity profile leads to a collapse of turbulence and in order to achieve the blunted profile shape, we employ a moving pipe segment that is briefly and rapidly shifted in the streamwise direction. The relaminarisation threshold and the minimum shift length and speeds are determined as a function of Reynolds number. Although turbulence is still active after the acceleration phase, the modulated profile possesses a severely decreased lift-up potential as measured by transient growth. As shown, this results in an exponential decay of fluctuations and the flow relaminarises. While this method can be easily applied at low to moderate flow speeds, the minimum streamwise length over which the acceleration needs to act increases linearly with the Reynolds number.

JFM classification

Turbulent Flows: Turbulence control Turbulent Flows: Turbulent transition
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 867 , 25 May 2019 , pp. 934 - 948
Copyright
© 2019 Cambridge University Press 

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Scarselli et al. supplementary movie

Relaminarisation of a turbulent pipe flow by wall movement for Re=5000, s=9D and Uw=Ub.

Download Scarselli et al. supplementary movie(Video)
Video 8 MB