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Numerical simulations of compressibility effects in free-surface flow resulting from wave impacts on an idealized seawall.

Tremblay, Olivier G.; Frandsen, Jannette (2016). Numerical simulations of compressibility effects in free-surface flow resulting from wave impacts on an idealized seawall. In: 6th International Conference on the Application of Physical Modelling in Coastal and Port Engineering and Science (Coastlab16), 10-13 mai 2016, Ottawa, Canada.

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Résumé

This study aims to investigate the free-surface flow involved in different wave impact types to achieve an improved insight in the design of seawalls and coastal infrastructures subjected to moderate and storm wave conditions. Local pressure as well as forces and overtopping quantities are of interest in designing such walls. Since forces and pressures highly vary depending on wave form at impact and amount of air trapped under breaking waves, it is necessary to achieve an accurate modeling of the breaking processes. Herein, a comparison between numerical results from a CFD model and experimental recordings conducted in the Quebec Coastal Physics Laboratory large scale flume is presented. The CFD model performance is tested to investigate the more fundamental mechanisms of the underlying processes and to assess real conditions around seawalls to facilitate design process. The preliminary results are based on 2D compressible flow simulations, as air-pocket physics and air-water interactions are important in predicting the pressure evolution on a seawall. Results show that compressible flow simulations present the same trend than experiments in terms of impact type, predict the same order of magnitude in pressure and that they can capture interesting characteristics such as air-pocket oscillations.

Type de document: (Article)
Mots-clés libres: wave impact; compressibility effects; free-surface flow; numerical simulations; large-scale experiment
Centre: Centre Eau Terre Environnement
Date de dépôt: 29 nov. 2016 21:52
Dernière modification: 29 nov. 2016 21:52
URI: http://espace.inrs.ca/id/eprint/4848

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