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- W1966582643 abstract "Effects of discretization scheme on the numerical modeling of 3D Rhône River plume dynamics are investigated. A higher order scheme of total variation diminishing (TVD) type is used to discretize advection terms of both momentum and scalar equations. It is shown that this scheme widely damps the numerical diffusion and improves the representation of the dynamical and density fronts bounding the flow. It enables to accurately investigate the effects of the turbulent diffusion, which was previously masked by the numerical one. Numerical results are also compared to in situ data for two situations related to different wind conditions. For the case without wind stress, associated to supercritical values of the Richardson number, optimized turbulent parameterization allows to recover the plume spreading and thickness, although local diffusion mechanisms are not precisely described. On the other hand, for the seaward wind case, associated to subcritical values of the Richardson number, numerical results and in situ data well agree on both the surface flow and the vertical density structure. L’influence des schémas de discrétisation d’un modèle numérique 3D sur la dynamique panacheuse du Rhône est étudiée. Des schémas de haute précision de type variation totale décroissante pour la discrétisation des équations de conservation de masse et de quantité de mouvement sont utilisés. La limitation de diffusion numérique caractéristique de ces schémas permet une meilleure représentation de la dynamique panacheuse, et plus particulièrement de ses fronts latéraux et de la stratification verticale. Les résultats numériques sont comparés à des données in situ pour différentes conditions de vent. Dans les cas sans vent, associés à des valeurs supercritiques du nombre de Richardson, la paramétrisation optimisée de la turbulence permet une bonne représentation de l’épaisseur et de l’extension du panache, tandis que les mécanismes locaux de diffusion ne sont pas décrits précisément. Par des conditions de vent de terre, associées à des valeurs sous-critiques du nombre de Richardson, les résultats numériques sont en bon accord avec les données in situ, pour l’écoulement de surface et la stratification verticale." @default.
- W1966582643 created "2016-06-24" @default.
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- W1966582643 date "2003-09-01" @default.
- W1966582643 modified "2023-09-30" @default.
- W1966582643 title "Modeling 3D Rhône river plume using a higher order advection scheme" @default.
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- W1966582643 doi "https://doi.org/10.1016/s0399-1784(03)00058-6" @default.
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