Edge degree-of-sharpness and free-stream turbulence scale effects on the aerodynamics of a bridge deck

On the applicability of 2D URANS and SSTk-ωturbulence model to the fluid-structure interaction of rectangular cylinders

“…The upper and lower boundaries have been defined as slip walls, that is, neglecting viscous effects caused by the wall surface. Taking into account that in the region close to these boundaries the flow is practically undisturbed, given the distance of the upper and lower boundaries from the bluff body, this is similar to imposing the uniform value of the inlet velocity along these boundaries as in Fransos and Bruno (2010) or Sarwar and Ishihara (2010). The walls of the rectangular cylinder surface are modeled as no-slip, taking into account that in the forced oscillation simulations the kinematic requirement that no flow can cross the wall is enforced (Donea, Huerta, Ponthot, & Rodríguez-Ferrán, 2004).…”

Probabilistic evaluation of the aerodynamic properties of a bridge deck

“…small and large chamfer) which sensitise bluff bodies with sharp edges to Reynolds number effects, choosing rectangular prisms as a benchmark. Fransos and Bruno (2010) systematically addressed the combined effects of the turbulence integral length scale and of the lower corner radius of curvature on the flow field around a trapezoidal section by means of computational simulations. To the author knowledge, no specific and systematic studies have been devoted up to now to the probabilistic evaluation of the aerodynamic or aeroelastic forces acting on sharp-edged bluff bodies, despite the rapid growing of reliability analyses of wind-excited large structures.…”

“…The present work aims at giving a contribution to characterise from a probabilistic point of view the aerodynamic properties of a bluff body, namely a bare bridge deck, whose trapezoidal cross section has been deterministically studied in the last decade by Ricciardelli and Hangan (2001), Mannini (2006), Fransos and Bruno (2010), and Mannini et al (in press). In particular two random variables are selected on the basis of the sensitivity analysis performed in Fransos and Bruno (2010): the oncoming turbulence integral length scale at low turbulence intensity and the radius of curvature of the section lower edges.…”

“…In particular two random variables are selected on the basis of the sensitivity analysis performed in Fransos and Bruno (2010): the oncoming turbulence integral length scale at low turbulence intensity and the radius of curvature of the section lower edges. Both parameters are characterised by a probability density function (PDF).…”

“…The method exploits the classical technology of weighted orthogonal polynomials, where two/three-point Gauss-Lobatto quadrature formulas are adopted in each element. As a result, the stochastic aerodynamic coefficients are described by their approximate PDFs, which are related in turn to the four aerodynamic regimes recognised in Fransos and Bruno (2010).…”