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Experiments and Simulations of Free-Surface Flow behind a Finite Height Rigid Vertical Cylinder

Article dans une revue avec comité de lecture
Author
AGEORGES, Valentin
56485 Laboratoire Ondes et Milieux Complexes [LOMC]
PEIXINHO, Jorge
56485 Laboratoire Ondes et Milieux Complexes [LOMC]
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
PERRET, Gaële
56485 Laboratoire Ondes et Milieux Complexes [LOMC]
LARTIGUE, Ghislain
962 Complexe de recherche interprofessionnel en aérothermochimie [CORIA]
MOUREAU, Vincent
962 Complexe de recherche interprofessionnel en aérothermochimie [CORIA]

URI
http://hdl.handle.net/10985/21219
DOI
10.3390/fluids6100367
Date
2021
Journal
Fluids

Abstract

We present the results of a combined experimental and numerical study of the free-surface flow behind a finite height rigid vertical cylinder. The experiments measure the drag and the wake angle on cylinders of different diameters for a range of velocities corresponding to 30,000 <Re< 200,000 and 0.2<Fr<2 where the Reynolds and Froude numbers are based on the diameter. The three-dimensional large eddy simulations use a conservative level-set method for the air-water interface, thus predicting the pressure, the vorticity, the free-surface elevation and the onset of air entrainment. The deep flow looks like single phase turbulent flow past a cylinder, but close to the free-surface, the interaction between the wall, the free-surface and the flow is taking place, leading to a reduced cylinder drag and the appearance of V-shaped surface wave patterns. For large velocities, vortex shedding is suppressed in a layer region behind the cylinder below the free surface. The wave patterns mostly follow the capillary-gravity theory, which predicts the crest lines cusps. Interestingly, it also indicates the regions of strong elevation fluctuations and the location of air entrainment observed in the experiments. Overall, these new simulation results, drag, wake angle and onset of air entrainment, compare quantitatively with experiments.

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