Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session A04: Aerodynamics: Fluid-Structure Interactions, General
8:00 AM–9:57 AM,
Sunday, November 19, 2023
Room: 101
Chair: Yuanhang Zhu, University of Virginia
Abstract: A04.00008 : Examining the interplay between body shape and stiffness for improving water entry*
9:31 AM–9:44 AM
Presenter:
Bart A Boom
(University of Washington)
Authors:
Bart A Boom
(University of Washington)
Tadd T Truscott
(King Abdullah University of Science and Technology)
Frank Fish
(West Chester University)
Ed Habtour
(University of Washington)
When a high-velocity rigid body breaches the water surface, the resulting impulse force, while brief,
is significantly high, and often damaging to the body. Here, experimental results show that a segmented
body with a single programmable stiffness element coupled with a nose cone and cylindrical after-body, can
mitigate high-velocity impact forces. Programming the stiffness allows the body to increase the impulse force
duration, and thus, alter the severity of the impact. Utilizing experimental prototypes with 25°, 45°, and
60°half-angle cone shapes, our findings show that the impulse force time decay and cavity shape evolution
can be manipulated directly by varying the stiffness between the segments. The study also demonstrates
the importance of the interplay between the cone shape and body stiffness. Notably, a body with 60°cone
exhibits the highest reduction in maximal impact acceleration, approximately 60% from the initial value of
17.0 g to 6.5 g for the rigid and a spring case, respectively. A preliminary discrete dynamic model is provided
for estimating the impulse forces for bodies with and without segmentation. The model shows reasonable
agreement with the experimental results.
*This research received no external funding.
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