A. Khayyer, A. Yeganeh Bakhtiari, A. Ghaheri, T. Asano,
Volume 2, Issue 4 (12-2004)
Abstract
A two-dimensional numerical model has been developed to study wave breaking on a
sloping beach. The basic elements of numerical model are Reynolds Averaged Navier-Stokes
(RANS) equations that describe the mean flow motion of a turbulent flow a k turbulence
closure model that describes the turbulent transport and dissipation process an efficient
technique (VOF- Volume Of Fluid method) for tracking the free surface motion and a new scheme
developed by Lin and Liu (1999) for wave generation. Shoaling, breaking and overturning of
solitary wave on a slope of 1/16 have been studied with the main emphasis on turbulence
characteristics. Turbulence characteristics i.e., turbulence kinetic energy, k turbulence
dissipation rate, turbulence production, pr turbulence eddy viscosity, vt and their spatial
distribution during the breaking process have been discussed in great details. Spatial distribution
of turbulence characteristics and the order of magnitude have been found to be in agreement with
existing experimental and numerical studies. The main characteristic of plunging breaking waves,
the shoreward advective transport of turbulence, has also been investigated and numerically
proved.
F. Hajivalie, A. Yeganeh Bakhtiary,
Volume 9, Issue 1 (3-2011)
Abstract
In this paper, a two-dimensional Reynolds Averaged Navier-Stokes (RANS) model is developed to simulate the shoaling, breaking and overtopping of a solitary wave over a vertical breakwater. Turbulence intensity is described by using a k turbulence closure model and the free surface configuration is tracked by Volume Of Fluid (VOF) technique. To validate the numerical model the simulation results is compared with the Xie (1981) experimental data and a very good agreement between them is observed. The results revealed that wave height and wave energy decrease considerably during the reflection from vertical wall, which illustrates a considerable energy lost during the impaction and wave overtopping process. The turbulence production during the broken wave interaction with vertical breakwater is very significant consequently the vertical breakwater undergoes sever turbulent and dynamic drag force.
