Air entrapment and its effect on pressure impulses in the slamming of a flat disc on water

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Show simple item record Jain, Utkarsh Vega Martínez, Patricia Van Der Meer, Devaraj 2022-05-12T08:47:00Z 2022-05-12T08:47:00Z 2021-12-10
dc.identifier.bibliographicCitation Jain, U., Vega-Martínez, P., & van der Meer, D. (2021). Air entrapment and its effect on pressure impulses in the slamming of a flat disc on water. In Journal of Fluid Mechanics (Vol. 928). Cambridge University Press (CUP).
dc.identifier.issn 1469-7645
dc.description.abstract The presence of ambient air in liquid-slamming events plays a crucial role in influencing the shape of the liquid surface prior to the impact, and the distribution of loads created upon impact. We study the effect of trapped air on impact loads in a simplified geometry, by slamming a horizontal flat disc onto a stationary water bath at a well-controlled velocity. We show how air trapping influences pressure peaks at different radial locations on the disc, how the pressure impulses are affected and how local pressure impulses differ from those obtained from area-integrated (force) impulses at impact. More specifically, we find that the air layer causes a gradual buildup of the load before the peak value is reached, and show that this buildup follows inertial scaling. Further, the same localised pressure impulse at the disc centre is found to be lower than the corresponding (area-integrated) force impulse on the entire disc. While the (area-integrated) force impulses are close to the classical result of Batchelor (An Introduction to Fluid Dynamics, Cambridge University Press, 1967, § 6.10) and Glasheen & McMahon (Phys. Fluids, vol. 8, issue 8, 1996, pp. 2078-2083), the localised pressure impulses at the disc centre, where the trapped air layer is at its thickest, lie closer to the theoretical estimation by Peters et al. (J. Fluid Mech., vol. 724, 2013, pp. 553-580) for an air-cushioned impact.
dc.description.sponsorship We acknowledge financial support from SLING (project number P14-10.1), which is partly financed by the Netherlands Organisation for Scientific Research (NWO). P.V.-M. acknowledges the support of the Spanish Ministry of Economy and Competitiveness through grants DPI2017-88201-C3-3-R and DPI2018-102829-REDT, partly funded with European funds.
dc.format.extent 21
dc.language.iso eng
dc.publisher Cambridge University Press (CUP)
dc.rights © The Author(s), 2021. Published by Cambridge University Press.
dc.rights Atribución 3.0 España
dc.subject.other Flow-Structure Interactions
dc.subject.other High-Speed Flow
dc.title Air entrapment and its effect on pressure impulses in the slamming of a flat disc on water
dc.type article
dc.subject.eciencia Física
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. DPI2017-88201-C3-3-R
dc.relation.projectID Gobierno de España. DPI2018-102829-REDT
dc.type.version publishedVersion
dc.identifier.publicationfirstpage 1
dc.identifier.publicationlastpage 21
dc.identifier.publicationtitle Journal of Fluid Mechanics
dc.identifier.publicationvolume 928
dc.identifier.uxxi AR/0000030524
dc.contributor.funder Ministerio de Economía y Competitividad (España)
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