Abstract
This paper describes the capability of a new model, called IH-3VOF to simulate wave-structure interaction problems using a three-dimensional approach. The model is able to deal with physical processes associated with wave interaction with porous structures. The model considers the VARANS equations, a volume-averaged version of the traditional RANS (Reynolds Averaged Navier-Stokes) equations. Turbulence is modeled using a k-ï¥ approach, not only at the clear fluid region (outside the porous media) but also inside the porous media. The model has been validated using laboratory data of free surface time evolution in a fish tank containing a porous dam. Numerical simulations were calibrated by adjusting the porous flow empirical coefficients for two granular material characteristics. Sensitivity analysis of porous parameters has also been performed. The model is proven to reproduce with a high degree of agreement the free surface evolution during the seeping process. Simulations of a three- dimensional porous dam breaking problem has been studied, showing the excellent performance of the model in reproducing fluid patterns around a porous structure. The model is powerful tool to examine the near-field flow characteristics around porous structures in three dimensional flow conditions.
Highlights
Design conditions for coastal structures should include a correct assessment of the structure functional response
The most relevant hydraulic processes to be considered in wave-structure interaction encompass wave reflection, wave dissipation, wave transmission resulting from wave overtopping and wave penetration through the porous structures, wave diffraction, run-up and wave breaking, involving several time and length scales, such as gravity waves (~100 m, ~10 s) or turbulent motions (
Model calibration is carried out based on measured data from one single test for each porous material, comparing computed and measured time evolution of free surface displacement at the whole fish tank including the porous dam
Summary
Design conditions for coastal structures should include a correct assessment of the structure functional response. The IH-3VOF model solves the three dimensional Reynolds Averaged Navier-Stokes (RANS) equations, based on the decomposition of the instantaneous velocity and pressure fields into mean and turbulent components. At each averaging operation applied to the momentum conservation equation, new terms appear that need to be modeled in order to obtain accurate solutions (see second line in equation (3)) The first of these terms is the volume-averaging Reynolds stress-tensor while the last two terms correspond with the effects that the porous medium causes to the flow. These two terms need closure equations to model the behavior of the processes by them represented. Calibration and validation work results are shown
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