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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Flow around a single emerged cylinder
Flow around a single emerged cylinder
Author : THOMAS DUCROCQ(1), JACQUES CHORDA(2), LUDOVIC CASSAN(3) & HELENE ROUX(4)
ABSTRACT
To ensure the ecological continuity and the free circulation of migratory fishes, facilities have to be built in or around
obstacles as dams. These facilities are called fishways and the focus is made, in this study, on "natural fishways" which
are high slopes channels composed of blocks rows arranged in staggered. The aim of the study is to understand the flow
structure in this kind of fishpasses in order to better design them and improve their passability. The first approach is
achieved on a single block to validate the model. Experiments are conducted on a laboratory flume and computations are
carried out with the same geometry. The tested configuration is an emerged cylinder with a diameter of 4cm, the energy
slope of the flow is of 0.34%. The software OpenFOAM which enables to do massively parallel computing is used for the
simulations. The VOF model is used to track the free surface and two turbulence models are tested. In the experiment,
particles are injected in the flow in order to reconstruct the velocity field by particle tracking, using a high speed camera.
The objective is the comparison of the free surface flow between experiments and simulation results at relative large
Froude number (F=0.54). Finally, the results show a good agreement between the experiments and the simulations. The
perspective is the simulation of a full fishpass.
File Size : 2,065,117 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 18/08/2015
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