Turbulence and energy dissipation mechanisms in steady spilling breaking waves induced by a shallowly submerged hydrofoil. (1st June 2021)

• Record Type: Journal Article
• Authors: Jin, Qiu; Hudson, Dominic; Temarel, Pandeli; Price, W. Geraint
• Is Part Of: Ocean engineering. Volume 229(2021)
• Publication Date: 2021-06-01
• Subjects: Spilling breaking waves -- Hydrofoil -- Turbulence -- Energy dissipation turbulent -- Free surface flow; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2021.108976
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: Wave breaking is one of the most violent phenomena in air-water interface interactions that need to be considered in ship and offshore structures design. Spilling breaking waves induced by a shallowly submerged hydrofoil are investigated using a Navier-Stokes solver for two-phase flow. Computed wave profiles and velocity fields are compared with experimental results and good agreement obtained. A related non-breaking wave case is designed based on the same numerical model to distinguish the hydrodynamic characteristics of the spilling breaking waves and allow investigation of effects on waves downstream. The velocity profile and turbulence intensity profiles at different sections from the two cases are compared with measurement data, where available. A detailed comparison of the wave-breaking process compared to the non-breaking wave is provided. Further, the energy dissipation processes for the two cases are analyzed and the ratio of the turbulent dissipation rate to the total energy dissipation calculated. It is shown that a large amount of energy is dissipated in the region of the breaking wave when compared to the non-breaking wave. Approximately 12% of the total energy dissipation may be attributed to the wave-breaking process, induced by energy redistribution and additional contributions to turbulent fluctuations in the breaker. Highlights: Aim to investigate hydrodynamic characteristics of spilling breaking waves. The free surface flow is simulated with Navier-Stokes equation and a VOF method. Turbulent flow is compared between non-breaking and breaking wave cases. The contribution of breaking waves to the whole energy dissipation is analyzed.