Characterization of the turbulent bistable flow regime of a 2D bluff body wake disturbed by a small control cylinder

Characterization of the turbulent bistable flow regime of a 2D bluff body wake disturbed by a... A small control cylinder placed in a turbulent wake of a much larger 2D bluff body can cause a significant increase in drag fluctuations. These fluctuations occur on timescales longer than the timescales of the vortex shedding. The critical positions of the control cylinder are highly localized. Ensemble averages of PIV acquisitions and pressure measurements at the base of the bluff body reveal a bistable wake regime. Long duration hot-wire measurements are used to characterize the states and the transition process. The results show that a stochastic process is responsible for the transitions between the two stable states. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Characterization of the turbulent bistable flow regime of a 2D bluff body wake disturbed by a small control cylinder

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2015 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-014-1890-6
Publisher site
See Article on Publisher Site

Abstract

A small control cylinder placed in a turbulent wake of a much larger 2D bluff body can cause a significant increase in drag fluctuations. These fluctuations occur on timescales longer than the timescales of the vortex shedding. The critical positions of the control cylinder are highly localized. Ensemble averages of PIV acquisitions and pressure measurements at the base of the bluff body reveal a bistable wake regime. Long duration hot-wire measurements are used to characterize the states and the transition process. The results show that a stochastic process is responsible for the transitions between the two stable states.

Journal

Experiments in FluidsSpringer Journals

Published: Jan 11, 2015

References

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