Validation of RANS modelling for wave interactions with sea dikes on shallow foreshores using a large-scale experimental dataset
Gruwez, V.; Altomare, C.; Suzuki, T.; Streicher, M.; Cappietti, L.; Kortenhaus, A.; Troch, P. (2020). Validation of RANS modelling for wave interactions with sea dikes on shallow foreshores using a large-scale experimental dataset. J. Mar. Sci. Eng. 8(9): 650. https://dx.doi.org/10.3390/jmse8090650
In: Journal of Marine Science and Engineering. MDPI: Basel. ISSN 2077-1312; e-ISSN 2077-1312, more
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| Author keywords |
validation; wave modelling; shallow foreshore; dike-mounted vertical wall; wave impact loads; OpenFOAM |
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- Cappietti, L.
- Kortenhaus, A., more
- Troch, P., more
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| Abstract |
In this paper, a Reynolds-averaged Navier–Stokes (RANS) equations solver, interFoam of OpenFOAM®, is validated for wave interactions with a dike, including a promenade and vertical wall, on a shallow foreshore. Such a coastal defence system is comprised of both an impermeable dike and a beach in front of it, forming the shallow foreshore depth at the dike toe. This case necessitates the simulation of several processes simultaneously: wave propagation, wave breaking over the beach slope, and wave interactions with the sea dike, consisting of wave overtopping, bore interactions on the promenade, and bore impacts on the dike-mounted vertical wall at the end of the promenade (storm wall or building). The validation is done using rare large-scale experimental data. Model performance and pattern statistics are employed to quantify the ability of the numerical model to reproduce the experimental data. In the evaluation method, a repeated test is used to estimate the experimental uncertainty. The solver interFoam is shown to generally have a very good model performance rating. A detailed analysis of the complex processes preceding the impacts on the vertical wall proves that a correct reproduction of the horizontal impact force and pressures is highly dependent on the accuracy of reproducing the bore interactions. |
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