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Effects of highly pulsatile inflow frequency on surface-mounted bluff body wakes

Published online by Cambridge University Press:  13 October 2020

Ian A. Carr Open the ORCID record for Ian A. Carr [Opens in a new window] ,
Nikolaos Beratlis Open the ORCID record for Nikolaos Beratlis [Opens in a new window] ,
Elias Balaras Open the ORCID record for Elias Balaras [Opens in a new window]  and
Michael W. Plesniak Open the ORCID record for Michael W. Plesniak [Opens in a new window]
Ian A. Carr*
Affiliation:
Department of Mechanical and Aerospace Engineering, George Washington University, Washington, DC20052, USA
Nikolaos Beratlis
Affiliation:
Arizona State University, Ira A. Fulton Schools of Engineering, School for Engineering of Matter, Transport and Energy, Tempe, AZ 85287, USA
Elias Balaras
Affiliation:
Department of Mechanical and Aerospace Engineering, George Washington University, Washington, DC20052, USA
Michael W. Plesniak
Affiliation:
Department of Mechanical and Aerospace Engineering, George Washington University, Washington, DC20052, USA
*
†Email address for correspondence: icarr@gwu.edu
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Abstract

Flow pulsatility is ubiquitous in biological and biomedical fluid dynamics. Cardiovascular flow, the most well-studied pulsatile flow, has benefited from decades of fundamental studies of the temporal influences of basic parameter changes in simplified models. A similar approach is employed herein on a relatively unstudied, canonical flow configuration. Using experiments and simulations, we examine highly pulsatile flow over a surface-mounted bluff body. The pulsatile (i.e. with no flow reversal) inflow waveform is sinusoidal, and the inflow pulsation frequency is varied from low-frequency, quasi-steady pulsation to high-frequency pulsatility. A wake regime map encompassing the range of pulsation frequency is created, and a mechanistic explanation of the regimes observed is put forth. Finally, we introduce a non-dimensional parameter applicable to pulsatile flows and point out remarkable similarity to the formation time parameter associated with vortex ring generation, including a similar critical value, despite substantive differences in the flow configurations.

JFM classification

Vortex Flows: Vortex dynamics Wakes/Jets: Separated flows
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 904 , 10 December 2020 , A29
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Copyright
© The Author(s), 2020. Published by Cambridge University Press

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