City Research Online

Unveiling the physical mechanism behind pistol shrimp cavitation

Koukouvinis, P., Bruecker, C. & Gavaises, M. (2017). Unveiling the physical mechanism behind pistol shrimp cavitation. Scientific Reports, 7(1), pp. 1-12. doi: 10.1038/s41598-017-14312-0


Snapping shrimps use a special shaped claw to generate a cavitating high speed water jet. Cavitation formed in this way, may be used for hunting/stunning prey and communication. The present work is a novel computational effort to provide insight on the mechanisms of cavitation formation during the claw closure. The geometry of the claw used here is a simplified claw model, based on prior experimental work. Techniques, such as Immersed Boundary and Homogenous Equilibrium Model (HEM), are employed to describe the claw motion and cavitating flow field respectively. The simulation methodology has been validated against prior experimental work and is applied here for claw closure at realistic conditions. Simulations show that during claw closure, a high velocity jet forms, inducing vortex roll-up around it. If the closure speed is high enough, the intensity of the swirling motion is enough to produce strong depressurization in the vortex core, leading to the formation of a cavitation ring. The cavitation ring moves along the jet axis and, soon after its formation, collapses and rebounds, producing high pressure pulses.

Publication Type: Article
Additional Information: Licensed under a Creative Commons Attribution 4.0 International License.
Publisher Keywords: Biomechanics; Fluid dynamics; Information theory; Computation
Departments: School of Science & Technology > Engineering
SWORD Depositor:
[thumbnail of pistol_shirmp_nature5.pdf]
Text - Accepted Version
Available under License Creative Commons: Attribution International Public License 4.0.

Download (2MB) | Preview
[thumbnail of Creative Commons: Attribution International Public License 4.0]
Text (Creative Commons: Attribution International Public License 4.0) - Other
Download (1MB) | Preview


Add to AnyAdd to TwitterAdd to FacebookAdd to LinkedinAdd to PinterestAdd to Email


Downloads per month over past year

View more statistics

Actions (login required)

Admin Login Admin Login