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Unsteady RANS Simulations of Flow around a Twin-Box Bridge Girder Cross Section

Department of Mechanical and Structural Engineering and Materials Science, University of Stavanger, Postboks 8600 Forus, 4036 Stavanger, Norway
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Energies 2019, 12(14), 2670; https://doi.org/10.3390/en12142670
Received: 21 May 2019 / Revised: 4 July 2019 / Accepted: 8 July 2019 / Published: 11 July 2019
(This article belongs to the Special Issue Engineering Fluid Dynamics 2019-2020)
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Abstract

The aerodynamic performance of bridge deck girders requires a thorough assessment and optimization in the design of long-span bridges. The present paper describes a numerical investigation of the aerodynamic characteristics of a twin-box bridge girder cross section in the range of angles of attack between −10.0° and +10.2°. The simulations are performed by solving 2D unsteady Reynolds-averaged Navier–Stokes (URANS) equations together with the k–ω shear stress transport (SST) turbulence model. The investigated Reynolds number (Re) based on the free stream velocity ( U ) and the height of the deck (D) is 31,000. The predicted aerodynamic characteristics such as the mean drag, lift and moment coefficients, are generally in good agreement with the results from the wind tunnel tests. Changes of flow patterns and aerodynamic forces with different angles of attack are investigated. Flow characteristics during one vortex shedding period are highlighted. Relative contributions of each of the two bridge decks to the overall drag and lift coefficients, with respect to the angle of attack, are also discussed. View Full-Text
Keywords: URANS; CFD; twin-box deck; aerodynamics; vortex shedding URANS; CFD; twin-box deck; aerodynamics; vortex shedding
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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

Jeong, W.; Liu, S.; Bogunovic Jakobsen, J.; Ong, M.C. Unsteady RANS Simulations of Flow around a Twin-Box Bridge Girder Cross Section. Energies 2019, 12, 2670.

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