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Flow-induced vibrations of a square prism free to oscillate in the cross-flow and inline directions

Published online by Cambridge University Press:  20 May 2021

Daniel W. Carlson Open the ORCID record for Daniel W. Carlson [Opens in a new window] ,
Todd M. Currier  and
Yahya Modarres-Sadeghi Open the ORCID record for Yahya Modarres-Sadeghi [Opens in a new window]
Daniel W. Carlson
Affiliation:
Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA 01003, USA
Todd M. Currier
Affiliation:
Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA 01003, USA
Yahya Modarres-Sadeghi*
Affiliation:
Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA 01003, USA
*
†Email address for correspondence: modarres@engin.umass.edu
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Abstract

We study flow-induced vibrations of a square prism free to oscillate in two degrees of freedom (cross-flow (CF) and inline (IL)), and placed in flow at varying angles of attack, by measuring the prism's displacement and flow-induced forces in both degrees of freedom experimentally, and conducting hydrogen bubble visualizations, as well as bubble image velocimetry. At large angles of attack (where $\alpha = 45^{\circ }$ corresponds to the case where one of the edges of the prism sees the flow first), we observe a two degree of freedom vortex-induced vibration (VIV) response with a figure-eight trajectory, similar to what has been observed for a cylinder with two degrees of freedom. As the angle of attack is decreased, the figure-eight trajectory transitions to a teardrop trajectory, suggesting a $1:1$ ratio between the oscillation frequencies in the CF and IL directions. The VIV response remains to be the dominant response down to an angle of attack of $\alpha = 20^{\circ }$. At angles of attack of $\alpha = 10^{\circ }$ and $\alpha = 15^{\circ }$, the VIV response becomes negligible and elliptical trajectories are observed at higher reduced velocities. These elliptical trajectories then become four-lobe trajectories with amplitudes mainly in the CF direction at the lowest angles of attack (where a side of the square sees the flow first) and galloping-type response is observed, where the amplitude of oscillations is increased with increasing reduced velocity. Deviations from a typical galloping response are observed due to synchronizations between the shedding frequency and oscillation frequency at ranges of higher reduced velocities.

JFM classification

Vortex Flows: Vortex shedding Wakes/Jets: Wakes Aerodynamics: Flow-structure interactions

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Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 919 , 25 July 2021 , A2
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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Footnotes

‡

Present address: Okinawa Institute of Science and Technology, Okinawa 904-0495, Japan.

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