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Simulation of freefall water entry of a finite wedge with flow detachment

Bao, CM; Wu, GX; Xu, G; (2017) Simulation of freefall water entry of a finite wedge with flow detachment. Applied Ocean Research , 65 pp. 262-278. 10.1016/j.apor.2017.04.014. Green open access

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Abstract

A two-dimensional finite wedge entering water obliquely in freefall with three degrees of freedom is considered through the velocity potential theory for the incompressible liquid. The problem is solved by using the boundary element method in the time domain. The scheme of the stretched coordinate system is adopted at the initial stages when only a small part of the wedge near its tip has entered water. The auxiliary function method is adopted to decouple the nonlinear mutual dependence between the body motions in three degrees of freedom and the fluid flow. When the liquid has detached from the knuckle of the wedge, the free jet is treated through the momentum equation. The developed method is verified through existing results for one degree of freedom in vertical motion. Various case studies are undertaken for a wedge entering water vertically, obliquely and with rotational angles. Results are provided the accelerations, velocities, pressure distribution and free surface deformation, and the physical implications are discussed.

Type: Article
Title: Simulation of freefall water entry of a finite wedge with flow detachment
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.apor.2017.04.014
Publisher version: http://doi.org/10.1016/j.apor.2017.04.014
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Oblique water entry; Boundary element method; Flow detachment with free jet; Free fall motion; Multi degrees of freedom; Auxiliary function
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1559558
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