Modeling of 2D irregular waves on a sloped bottom

The present work explains and validates a method to numerically reproduce two dimensional  irregular sea states in a wave basin without knowing the paddle motion and with the only the wave elevation measured at the inlet of the wave tank. The free surface elevation is numerically treated, a cut off to the spectrum was applied reduce the number of frequencies is applied and finally a linear reflection analysis is then tapplied with the assumption that the free surface elevation at any location in the domain can be described by a Fourier series. The first order kinemtics were then generated using the extrapolation method suggested in the standards and used as boundary conditions at the inlet of the domain. Two time series from a wave tank experiment with waves evloving on a slope were reproduced and a very good agreement both in the time domain and frequency domain was found between the simulations and the experiments. This method allows to reproduce and generate high order irregular waves which would otherwise be impossible to generate with engineering models and shows that CFD simulations can be used and tusted when reproducing extreme events.

Luca Oggiano
Session Time Slot(s): 
07/03/2017 - 2:25pm-07/03/2017 - 2:50pm
Convention Hall 1D
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Session Tracks (STAR Global Conference 2017)