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Computation 2015, 3(3), 479-508; doi:10.3390/computation3030479

Applicability of URANS and DES Simulations of Flow Past Rectangular Cylinders and Bridge Sections

CRIACIV/Department of Civil and Environmental Engineering, University of Florence, Via S. Marta 3, Florence 50139, Italy
Academic Editor: Manfred Krafczyk
Received: 20 July 2015 / Revised: 28 August 2015 / Accepted: 8 September 2015 / Published: 18 September 2015
(This article belongs to the Special Issue Computational Fluid Dynamics in Civil Engineering)

Abstract

This paper discusses the results of computational fluid dynamics simulations carried out for rectangular cylinders with various side ratios of interest for many civil engineering structures. A bridge deck of common cross-section geometry was also considered. Unsteady Reynolds-averaged Navier–Stokes (URANS) equations were solved in conjunction with either an eddy viscosity or a linearized explicit algebraic Reynolds stress model. The analysis showed that for the case studies considered, the 2D URANS approach was able to give reasonable results if coupled with an advanced turbulence model and a suitable computational mesh. The simulations even reproduced, at least qualitatively, complex phenomena observed in the wind tunnel, such as Reynolds number effects for a sharp-edged geometry. The study focused both on stationary and harmonically oscillating bodies. For the latter, self-excited forces and flutter derivatives were calculated and compared to experimental data. In the particular case of a benchmark rectangular 5:1 cylinder, 3D detached eddy simulations were also carried out, highlighting the improvement in the accuracy of the results with respect to both 2D and 3D URANS calculations. All of the computations were performed with the Tau code, a non-commercial unstructured solver developed by the German Aerospace Center. View Full-Text
Keywords: computational fluid dynamics; unsteady RANS; detached eddy simulation; bluff body aerodynamics; rectangular cylinders; bridge section; flutter derivatives computational fluid dynamics; unsteady RANS; detached eddy simulation; bluff body aerodynamics; rectangular cylinders; bridge section; flutter derivatives
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Mannini, C. Applicability of URANS and DES Simulations of Flow Past Rectangular Cylinders and Bridge Sections. Computation 2015, 3, 479-508.

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