Goktepeli, I.2025-02-102025-02-1020241791-93201791-2377https://doi.org/10.25103/jestr.176.10https://hdl.handle.net/20.500.13091/9876The aim of the study is to examine aerodynamic flow characteristics of a box girder and a twin-box girder have been investigated at Re = 20000. The methods based on k-ε and k-ω turbulence models have been compared. The minimum pressure has been observed on the lower surfaces for the box girder. Nevertheless, it has been provided for the upper surfaces of the twin-box girder. The highest value for turbulent kinetic energy has been obtained below the downstream fairing of the box girder. The same value has been attained in the slot. Lower values are weaker for the streamwise velocity components of the box girder. The lowest values have been seen in the gap of the twin-box girders and it behaved like a cavity. For cross-stream velocity components, maximum and minimum values depended on the rotational direction of the clusters. The wake has been enlarged perpendicular to flow for the twin-box girder, however, the wake shrunk due to the same effect. For the wake region, turbulence model and girder type have strongly influenced the velocity magnitude profiles. Drag coefficients are in good agreement with those previously reported. However, k-ω SST turbulence model has been suggested by a little margin. © (2024), (International Hellenic University School of Science and Technology). All rights reserved.eninfo:eu-repo/semantics/closedAccessBox girderdrag coefficientReynolds numberturbulence modeltwin-box girderArticle10.25103/jestr.176.102-s2.0-85215400153