Simulation of complete water exit of a fully-submerged body. (October 2015)

• Record Type: Journal Article
• Authors: Ni, B.Y.; Zhang, A.M.; Wu, G.X.
• Is Part Of: Journal of fluids and structures. Volume 58(2015:Oct.)
• Page Start: 79
• Page End: 98
• Publication Date: 2015-10
• Subjects: Complete water exit -- Free-surface breakup -- Body/water detachment -- Boundary-element method; Fluid-structure interaction -- Periodicals; Fluid mechanics -- Periodicals; Structural dynamics -- Periodicals; Structural analysis (Engineering) -- Periodicals; 620.106
• DOI: 10.1016/j.jfluidstructs.2015.07.010
• Languages: English
• ISSNs: 0889-9746

Abstract

Abstract: The whole process of water exit of a fully-submerged rigid body is simulated using the boundary-element method for the velocity potential. A numerical procedure is proposed for the free-surface breakup as well as for body detachment from water. Convergence and sensitivity studies have been conducted for the procedure and consistent results have been achieved. Detailed simulations are undertaken for a spheroid emerging and departing from water. Results are provided for pressure and force on the body, as well as the step-by-step free surface deformation, including the development of the jet and formation of the cavity. The effect of Froude number is investigated, as well as the body shape in terms of the ratio of its horizontal and vertical dimensions. Highlights: ● The whole process of a spheroid emerging and departing from water is simulated. ● A numerical procedure is proposed for the free-surface breakup and body detachment. ● A longer liquid film and a higher free surface peak emerge for a blunter body. ● A local force peak is observed before the body detachment for high Froude number.