Experimental and Numerical Study of the Flow Structure around Two Partially Buried Objects on a Deformed Bed

AbstractThe flow characteristics around two partially buried objects, a short cylinder (SC) and a truncated cone (TC) were examined experimentally and numerically. Experiments were conducted in a large tilting flume with vertical walls made of acrylic plastic and steel floor covered by a 24-m long s...

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Bibliographic Details
Published in:Journal of hydraulic engineering (New York, N.Y.) N.Y.), 2013-03, Vol.139 (3), p.269-283
Main Authors: Cataño-Lopera, Yovanni A, Landry, Blake J, Abad, Jorge D, García, Marcelo H
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Computational fluid dynamics
Cylinders
Earthwork. Foundations. Retaining walls
Exact sciences and technology
Geotechnics
Hydraulic constructions
Kinetic energy
Mathematical models
Navier-Stokes equations
Offshore structure (platforms, tanks, etc.)
Sand
Technical Papers
Turbulence
Turbulent flow
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Summary:AbstractThe flow characteristics around two partially buried objects, a short cylinder (SC) and a truncated cone (TC) were examined experimentally and numerically. Experiments were conducted in a large tilting flume with vertical walls made of acrylic plastic and steel floor covered by a 24-m long sand pit. For each experiment, the object was placed on a flat sandy bed, the flume was filled to a water depth of 41 cm, and a steady unidirectional current was established at high Reynolds numbers while sinking of the object was tracked over time. Velocity records were taken with an acoustic Doppler velocimeter (ADV) probe at the final stage of burial and scour hole evolution. The flow structure around each object was further investigated using a model that solves the Reynolds-averaged Navier-Stokes (RANS) equations coupled with a κ-ε turbulence closure model, and results were compared to the experimental measurements. Measurements and numerical simulations allowed identification of regions of high and low velocity and turbulent kinetic energy accounting for zones of potential sediment erosion and deposition that dictate the burial of the object. The κ-ε turbulence closure model was shown to reproduce the experimental mean flow velocity and turbulent kinetic energy with acceptable accuracy.
ISSN:0733-9429
1943-7900
DOI:10.1061/(ASCE)HY.1943-7900.0000619