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Three-dimensional numerical simulation of flow around a 1:5 rectangular cylinder

Mannini, Claudio and Weinman, Keith and Soda, Ante and Schewe, Günter (2009) Three-dimensional numerical simulation of flow around a 1:5 rectangular cylinder. In: Proceedings of 5th European and African Conference on Wind Engineering (EACWE 5). Firenze University Press. 5th European and African Conference on Wind Engineering (EACWE 5), 19-23 July 2009, Florence, Italy.

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Official URL: http://www.iawe.org/Proceedings/5EACWE/110.pdf


This paper deals with the three-dimensional simulation of the unsteady flow around a stationary 1:5 rectangular cylinder at zero-degree angle of attack, low Mach number and relatively high Reynolds number. The computations have been performed using the DLR-Tau code, a non-commercial finite-volume code developed at the German Aerospace Center, and results obtained with a hybrid mesh are validated against the available experimental data, showing good agreement. Detached-Eddy Simulation (DES), that is a hybrid method combining Large-Eddy Simulation (LES) and Raynolds-Averaged Navier-Stokes (RANS) approaches, has been adopted as strategy of turbulence modelling. The comparison with respect to unsteady RANS results, although obtained with advanced turbulence models, show the improvement that can be expected with the DES technique for this type of massively separated bluff-body flows. The paper also clarifies the key role played in LES, and therefore also in DES simulations, by the artificial dissipation characterizing the numerical scheme used to discretize the filtered Navier-Stokes equations. Finally, the discussed results highlight the effects of the spanwise extension of the computational domain. A distance between the periodic boundary planes equal to the width of the cylinder is not enough to allow the natural loss of correlation of pressures and the free development of large-scale turbulent structures. In contrast, a span equal to the double of the cylinder width fulfill much better this requirement.

Item URL in elib:https://elib.dlr.de/64896/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Three-dimensional numerical simulation of flow around a 1:5 rectangular cylinder
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mannini, ClaudioCRIACIV/Department of Civil and Environmental Engineering, University of Florence, ItalyUNSPECIFIED
Soda, AnteFaculty of Mechanical and Naval Engineering, University of Zagreb, CroatiaUNSPECIFIED
Journal or Publication Title:Proceedings of 5th European and African Conference on Wind Engineering (EACWE 5)
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Publisher:Firenze University Press
Keywords:Computational Fluid Dynamics, Bluff Bodies, Rectangular Cylinder, Detached-Eddy-Simulation, Turbulence Modelling
Event Title:5th European and African Conference on Wind Engineering (EACWE 5)
Event Location:Florence, Italy
Event Type:international Conference
Event Dates:19-23 July 2009
Organizer:University of Florence
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flexible Aircraft (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Erdmann, Daniela
Deposited On:19 Oct 2010 10:59
Last Modified:19 Oct 2010 10:59

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