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Water impact of a surface-patterned disk

Published online by Cambridge University Press:  15 March 2021

Taehyun Kim ,
Donghyun Kim Open the ORCID record for Donghyun Kim [Opens in a new window]  and
Daegyoum Kim Open the ORCID record for Daegyoum Kim [Opens in a new window]
Taehyun Kim
Affiliation:
Department of Mechanical Engineering, KAIST, Daejeon34141, Republic of Korea
Donghyun Kim
Affiliation:
Department of Mechanical Engineering, KAIST, Daejeon34141, Republic of Korea
Daegyoum Kim*
Affiliation:
Department of Mechanical Engineering, KAIST, Daejeon34141, Republic of Korea
*
†Email address for correspondence: daegyoum@kaist.ac.kr
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Abstract

This study experimentally investigates the effect of a surface pattern applied to a flat disk on the impact force during water entry. A macroscale mesh-like pattern with square holes is applied to the bottom surface of a flat disk, and the shape of the pattern and the falling speed of the disk are varied to find a universal parameter that characterizes the impact force. When a surface-patterned disk impacts a free surface, air is trapped inside the holes, and the subsequent compression and depressurization of the trapped air is accompanied by a rise and fall in the impact force. Under the cushioning effect of the trapped air, the peak of the impact force decreases and its period extends as the total volume of holes in the surface pattern increases. These changes are independent of the specific shape of the pattern. In contrast, the impulse exerted on the disk remains similar, regardless of the total volume of holes and the pattern. We conduct a simple theoretical analysis based on the added mass of the disk to estimate the impact force, and confirm the trends observed in our experiments.

JFM classification

Interfacial Flows (free surface): Interfacial Flows (free surface)
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 915 , 25 May 2021 , A52
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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References

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