Unsteady RANS simulations of flow around a bridge section (CROSBI ID 183425)
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Podaci o odgovornosti
Mannini, Claudio ; Šoda, Ante ; Voss, Ralph ; Schewe, Guenter
engleski
Unsteady RANS simulations of flow around a bridge section
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.
Bridges; Bluff bodies; Unsteady aerodynamics; Computational fluid dynamics; Turbulence modelling; URANS; Reynolds number effects
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Podaci o izdanju
98 (12)
2010.
742-753
objavljeno
0167-6105
10.1016/j.jweia.2010.06.010