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Application d'un modèle CFD pour analyser la structure verticale de l'écoulement dans un environnement vagues-courant
| Content Provider | Semantic Scholar |
|---|---|
| Author | Teles, M. J. Benoit, Michel Pires-Silva, A. A. |
| Copyright Year | 2013 |
| Abstract | L'hydrodynamique de la circulation cotiere resulte de la contribution d'une grande variete de phenomenes (courants de circulation a grande echelle, effets de maree, vagues, action du vent, etc.) qui ont des interactions physiques complexes et des echelles differentes. Parmi ces interactions, nous nous concentrons ici sur l'interaction entre les vagues et le courant, particulierement lorsque le courant presente un cisaillement fort sur la colonne d'eau. Dans le present travail, l'evaluation et l'analyse des interactions vagues-courant est realisee grâce a des simulations numeriques fondees sur les equations de Navier-Stokes en moyenne de Reynolds (Reynolds Averaged Navier Stokes, RANS), appliquees a la modelisation de l'ecoulement complet, a savoir vagues et courant simultanement (i.e. sans decoupler les deux phenomenes). Le solveur CFD avance Code_Saturne (ARCHAMBEAU et al., 2004) est employe a cette fin. Les resultats numeriques sont compares aux donnees experimentales de UMEYAMA (2005). Quatre hauteurs et periodes differentes de vague sont examinees pour chaque cas : (i) vagues seules, (ii) vagues et courant dans le meme sens et (iii) vagues s'opposant au courant. Une etude detaillee des changements induits par les interactions vagues-courant sur les profils verticaux de vitesses horizontales moyennes, de contraintes de Reynolds et de viscosite turbulente est presentee. Translated version: A CFD model application to analyze the vertical structure of flow in the wave-current environment The nearshore hydrodynamics and coastal circulation result from a variety of phenomena involving complex physical interactions with different scales (large scale circulation currents, tidal effects, waves, wind action, etc.). Among these interactions, we focus on the interaction between waves and currents, especially when the current presents a strong shear over the water depth. In the present work, the evaluation and analysis of wave-current interactions is made through numerical simulations based on Reynolds Averaged Navier-Stokes (RANS) equations, applied to the modelling of the complete flow motion, namely waves and currents simultaneously (i.e. without decoupling the two phenomena). The advanced CFD solver Code_Saturne (ARCHAMBEAU et al., 2004) is used for this purpose. Numerical results are compared with experimental data from UMEYAMA (2005). Four different wave heights and wave periods are tested for each case: (i) waves only, (ii) waves following current and (iii) waves opposing current. A detailed study of the modifications linked to wave-current interactions on vertical profiles of mean horizontal velocities, Reynolds stresses and turbulent viscosities, is presented. Keywords: Wave-current interaction; Reynolds stress; Turbulent viscosity; Code_Saturne. |
| File Format | PDF HTM / HTML |
| DOI | 10.5150/revue-paralia.2013.010 |
| Volume Number | 6 |
| Alternate Webpage(s) | http://www.paralia.fr/revue/rpa1310.pdf |
| Alternate Webpage(s) | https://doi.org/10.5150/revue-paralia.2013.010 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
