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Descripción
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| n this work, the ?ow normal to a rectangular ?at plate with sharp angles in the presence of the free surface and gravity has been studied numerically, using a three dimensional (3D) Large Eddy Simulation (LES) methodology. Most of the previous studies on this geometry consider either periodic assumptions or laminar regime Re ? O(103). The numerical study described here, with a fully 3D simulation of the ?at plate in turbulent regime Re ? O(105) has not been reported before. Important di?erences have been found respect the laminar case or when periodic boundary conditions are assumed. The in?uence of the gravity force and the free surface interface on the hydrodynamics of the problem is extremely relevant for industrial applications. The simulations are initially validated using a reference case with a plate with sharp corners and a single phase laminar 3D-periodic con?guration. The time averaged drag force, the velocity and pressure ?elds are compared as well against the case of the plate with smooth corners. Finally, in the case of the two-phase 3D numerical simulations, the drag force and the vorticity ?elds in the near wake of the plate are compared to recent experimental work Satheesh and Huera-Huarte (2019) E?ect of the free surface on a ?at plate translating normal to the ?ow. Ocean Engineering 171, 458 - 468. These experiments were used as a guideline for the computational set-up, consequently the value of most of the dimensionless parameters are the same. A second scenario where the free surface is replaced by a solid wall is considered. Two important observations show up after this research, ?rst the characteristic unsteady frequencies that are found associated to two periodic regimes, disappears when 3D cases are evaluated. In such scenario, no dominant frequencies are found. Second, a critical submergence depth (distance) between the upper part of the plate and the free surface (or solid wall) has been found, where the drag force shows a maximum value. This observations are discussed in relation to the pressure distribution, the vortex structures formed at the wake and the gap ?ow formed between the plate and the free surface. | |
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Internacional
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JCR del ISI
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Si |
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Título de la revista
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Physics of Fluids |
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ISSN
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1070-6631 |
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Factor de impacto JCR
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2,279 |
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Información de impacto
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Datos JCR del año 2017 Q1 |
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Volumen
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DOI
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