Abstract:
Methodologies to be used in numerical models based on Reynolds-averaged Navier–Stokes
(RANS) equations and the volume of fluid (VoF) to deal with waves over coastal structures, which
involve wave breaking and overtopping and porous structures, are shown in this manuscript. Two
turbulence models, k-ε NLS (non-linear Reynolds stress tensor) and k-ε SCM (stabilized closure
model), that are used to avoid the growth of the eddy viscosity, are implemented in the FLUENT®
numerical model. Additionally, equations of momentum and turbulence models are adapted to
simulate porous media of coastal structures. Comparisons of performance of k-ε NLS, k-ε SCM
and standards k-ε and k-ω SST models in several classical cases of regular and random waves on
coastal structures are carried out. It was noticed that the standard k-ε turbulence model, and k-ω SST
with less intensity, over-predicted eddy viscosity, caused the decay of the free surface elevation and
under-estimated wave overtopping discharge. k-ε NLS and k-ε SCM turbulence models have similar
performance, with slightly better results of k-ε NLS, showing good agreement with experimental ones.
