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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : An investigation on plunging breaking waves over a slope with a cfd based numerical wave tank
An investigation on plunging breaking waves over a slope with a cfd based numerical wave tank
Author : MAYILVAHANAN ALAGAN CHELLA(1), HANS BIHS(2) & DAG MYRHAUG(3)
ABSTRACT
In the present investigation, the CFD based numerical wave tank REEF3D is utilized to simulate plunging breaking
waves over a slope. The numerical model solves the incompressible Reynolds Averaged Navier-Stokes (RANS)
equations over a Cartesian grid. This model uses staggered configuration for the location of the velocity and the
pressure, which is important to describe the distinct density jumps across the water-air interface accurately. The main
feature of breaking waves is the complex motion of the free surface. The flow problem is solved as a two-phase flow of
water and air, with the free surface being represented by the level set method. A large amount of energy is dissipated
through the action of turbulence during the wave breaking process, and the turbulence is described by the k-ω model.
The 5th-order Weighted Essentially Non-Oscillatory (WENO) scheme is employed for the convective discretization. A
comprehensive examination of breaking process is essential for the understanding of the mechanisms of wave breaking
over slopes. The main focus of the present numerical study is to investigate the breaking process of plunging breaker
over a sloping bed. The numerical experiments are performed with the 5th-order cnoidal waves over a sloping bed with a
slope of 1:35. The present numerical model is validated by comparing the numerical results with experimental results by
Ting and Kirby (1995). The study further investigates the variations in the free surface elevation, horizontal velocity,
wave envelope and wave profile in different regions during the wave breaking process. The simulated horizontal
velocities, free surface elevations and wave envelope are in good agreement with the experimental measurements.
Moreover, the present model can describe the key flow features during the breaking process such as the motion of air
pockets in the water, formation of a forward moving jet, the splash-up phenomenon and the mixing of air and water in
the breaking region.
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 20/08/2015
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