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Numerical Study of Turbulent Oscillations Around a Cylinder: RANS Capabilities and Sensitivity Analysis
Valero Huerta, Daniel; Bung, Daniel B.; Erpicum, Sébastien et al.
2017In Proceedings of the 37th IAHR World Congress
Peer reviewed
 

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2017 Valero NUMERICAL STUDY OF TURBULENT OSCILLATIONS AROUND A CYLINDER RANS CAPABILITIES AND SENSITIVITY ANALYSIS.pdf
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Keywords :
Turbulence modelling; circular pier; flow oscillations; instabilities
Abstract :
[en] Numerical modelling is commonly used in a large range of environmental fluid mechanics applications. It has become widely accepted and, with increasing computer power, the employed models are increasing also in complexity. Reynolds Averaged Navier-Stokes (RANS) equations are the preferred approach for 3D problems, being especially suited for the computation of the mean flow. However, little is known about RANS performance for the fluctuating quantities; being reasonable to expect an impairment in the accuracy. In this study, a simple geometry (cylindrical pier) is subject to different numerical settings in order to assess their effect on the development of the physically based flow instabilities. Mesh refinement has shown to enhance the perturbation growth rate while maximum CFL value has not produced any effect. RNG k-ϵ and k-ω have shown to be more dissipative than k-ϵ. Some advection schemes seem to increase the spurious perturbation converging to the physically based ones. Finally, introducing an experimentally based perturbation at the inlet has proven to speed up the process.
Research center :
UEE - Urban and Environmental Engineering - ULiège
Disciplines :
Civil engineering
Author, co-author :
Valero Huerta, Daniel ;  Université de Liège - ULiège > Form. doct. sc. ingé. & techn. (archi., gén. civ. - paysage)
Bung, Daniel B.;  FH Aachen > Hydraulic Engineering Section (HES)
Erpicum, Sébastien  ;  Université de Liège > Scientifiques attachés au Doyen (Sc.appliquées)
Dewals, Benjamin  ;  Université de Liège > Département ArGEnCo > Hydraulics in Environmental and Civil Engineering
Language :
English
Title :
Numerical Study of Turbulent Oscillations Around a Cylinder: RANS Capabilities and Sensitivity Analysis
Publication date :
August 2017
Event name :
37th IAHR World Congress
Event organizer :
IAHR
Event place :
Kuala Lumpur, Malaysia
Event date :
from 13-08-2017 to 18-08-2017
Audience :
International
Main work title :
Proceedings of the 37th IAHR World Congress
Pages :
3126-3135
Peer reviewed :
Peer reviewed
Available on ORBi :
since 12 September 2017

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