This paper discusses the sensitivity of the aerodynamic behaviour of a trapezoidalshaped bridge deck cross-section to its lower corner degree-of-sharpness and to the incoming flow turbulence integral length scale in conjunction with low turbulence intensity. Since these features are hard to set and measure in experimental facilities, the aerodynamic behaviour of the body has been investigated through the computational simulation of the flow around it. The results are given in term of force coefficients, Strouhal number, pressure distribution along its surface, and the mean and instantaneous flow patterns. Dramatic changes in the force coefficients and Strouhal number occur following small changes in the parameters’ values. These changes have been found to be due to significant modifications in the topological structure of the flow. Special emphasis has been given to the analysis of the separation and reattachment points, the recirculation bubble length, the vortex shedding mechanisms and the wake structures. On the basis of the obtained results, four aerodynamic regimes have been pointed out in analogy with the well-known individual Re number regimes. Some of these regimes have also been recognized on the Sunshine Skyway Bridge cross-section, even when the sharping aerodynamic devices at the lower corners are taken into consideration.

Edge degree-of-sharpness and integral length scale effects on the aerodynamics of a bridge deck / Bruno, Luca; Fransos, Davide. - ELETTRONICO. - (2008). (Intervento presentato al convegno BBAA VI International Colloquium on: Bluff Bodies Aerodynamics & Applications tenutosi a Milano nel 27-31 July 2008).

Edge degree-of-sharpness and integral length scale effects on the aerodynamics of a bridge deck

BRUNO, Luca;FRANSOS, DAVIDE
2008

Abstract

This paper discusses the sensitivity of the aerodynamic behaviour of a trapezoidalshaped bridge deck cross-section to its lower corner degree-of-sharpness and to the incoming flow turbulence integral length scale in conjunction with low turbulence intensity. Since these features are hard to set and measure in experimental facilities, the aerodynamic behaviour of the body has been investigated through the computational simulation of the flow around it. The results are given in term of force coefficients, Strouhal number, pressure distribution along its surface, and the mean and instantaneous flow patterns. Dramatic changes in the force coefficients and Strouhal number occur following small changes in the parameters’ values. These changes have been found to be due to significant modifications in the topological structure of the flow. Special emphasis has been given to the analysis of the separation and reattachment points, the recirculation bubble length, the vortex shedding mechanisms and the wake structures. On the basis of the obtained results, four aerodynamic regimes have been pointed out in analogy with the well-known individual Re number regimes. Some of these regimes have also been recognized on the Sunshine Skyway Bridge cross-section, even when the sharping aerodynamic devices at the lower corners are taken into consideration.
2008
8890191643
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/1853808
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo