Naslov
Unsteady RANS simulations of flow around a bridge section

Autori
Mannini, Claudio ; Šoda, Ante ; Voss, Ralph ; Schewe, Guenter

Izvornik
Journal of wind engineering and industrial aerodynamics (0167-6105) 98 (2010), 12; 742-753

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Bridges; Bluff bodies; Unsteady aerodynamics; Computational fluid dynamics; Turbulence modelling; URANS; Reynolds number effects

Sažetak
This paper presents the results of unsteady Reynolds-averaged Navier–Stokes (URANS) simulations of flow around a common bridge deck geometry. Computations are performed with a noncommercial unstructured flow solver using two-dimensional hybrid meshes with fine near-wall resolution. The influence of different simulation parameters (grid refinement, time-step size, turbulence modelling) is analyzed, in particular in order to obtain flow solutions independent of spatial and temporal discretization. Results given by a one-equation eddy-viscosity turbulence model and a two-equation explicit algebraic Reynolds stress model are compared. Despite the limits imposed by the URANS approach and the relatively inexpensive two-dimensional computations, satisfactory agreement is found with the experimentally measured forces and pressures. These simulations help to explain the discrepancy between the results of two wind-tunnel test campaigns and show the dramatic influence of non-perfectly sharp edges on the global flow field development. The capability of the numerical approach to capture complex Reynolds number effects is also discussed.

Izvorni jezik
Engleski

Znanstvena područja
Računarstvo, Strojarstvo

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