1. Modeling oil dispersion under breaking waves. Part I: Wave hydrodynamics
- Author
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Joseph Katz, Cosan Daskiran, Brian Robinson, Michel C. Boufadel, Thomas King, Kenneth Lee, and Fangda Cui
- Subjects
Turbulence ,business.industry ,Wave turbulence ,0208 environmental biotechnology ,Breaking wave ,02 engineering and technology ,Mechanics ,Computational fluid dynamics ,01 natural sciences ,010305 fluids & plasmas ,020801 environmental engineering ,Physics::Fluid Dynamics ,0103 physical sciences ,Turbulence kinetic energy ,Volume of fluid method ,Environmental Chemistry ,Reynolds-averaged Navier–Stokes equations ,Dispersion (water waves) ,business ,Water Science and Technology - Abstract
The dispersion (transport and breakup) of oil droplets under breaking waves is essential for evaluating the impact of oil spills on the environment, and for designing countermeasures. In this part of the work (Part I), the hydrodynamics of a wave breaker in a 1.0 m deep tank obtained experimentally by Rapp and Melville (Philos Trans R Soc Lond A Math Phys Eng Sci 331(1622):735–800, 1990) using the dispersive focusing method was investigated numerically using Reynold-averaged Navier–Stokes (RANS) within the CFD code ANSYS Fluent. The renormalization group (RNG) k–e turbulence closure model was adopted to simulate wave turbulence, and the transient water–air interface was captured using volume of fluid (VOF) method. The simulated surface excursion and velocity fields matched closely the experimental observations during wave breaking. The energy dissipation of the wave crest showed good agreement with recent laboratory work and numerical simulations through evaluating the breaking parameter. The RANS approach was able to reproduce the turbulent kinetic energy field engendered by the breakers and simulated the residual turbulence within about two wave periods after the passage of the wave train. The VOF scheme Compressive provided a better agreement with the observation than the Geo-reconstruct scheme. The approach herein suggests that RANS method coupled with VOF in ANSYS Fluent is capable of capturing the major hydrodynamic forces and turbulence, and thus could be used to predict environmental processes within the breaking waves such as oil droplet formation and transport.
- Published
- 2020