Evaluation of Reynolds number effects on flutter derivatives of a flat plate by means of a computational approach

Stochastic aerodynamics and aeroelasticity of a flat plate via generalised Polynomial Chaos

“…5(a) shows that the experimental data (Schaaf and Sherman, 1954;Dickinson and Gotz, 1993;Sunada et al, 1997;Sun and Boyd, 2004) in the Reo400 region are badly fitted by the proposed ME-gPC interpolation. This is not surprising, because this region contains a change in the physical regime, as already pointed out by Bruno and Fransos (2008). At the same time, the probability that the input random variable Re is in that region is only 2:3 Â 10 À4 .…”

“…The profile of the mean value distribution is close to the classical Goldstein solution [see, e.g., Schlichting (1979)], which is plotted here for reference. The variance is shown to rapidly decrease moving downstream: this is due to the fact that, in an analogous manner to the deterministic analysis in Bruno and Fransos (2008), the Re sensitivity of the boundary layer thickness locally affects the near wake velocity defect, while the Re sensitivity strongly decays at a distance far downwind. The u x boxplot representation also suggests a more symmetrical statistical distribution than the C f one all along the wake.…”

“…Other physical quantities can be chosen as output random variables to complete the stochastic description of the flow-field. Among all the possible choices, the friction coefficient C f along the lateral wall of the plate and the horizontal velocity u x in the plate wake are considered in the following, analogously to what was done in Bruno and Fransos (2008).…”

On the effects of the gap on the unsteady pressure characteristics of two-box bridge girders

“…Despite the fact that studies have demonstrated a dependence between aerodynamic derivatives and the Reynold's number [20,22,23], wind tunnel tests have provided good approximations for these coefficients by considering only the reduced wind velocity, the geometry of the cross section and the relative angle of attack [24]. In this sense, it is expected that the unsteady pressure characteristics obtained from the experiments are valid for the purposes of this investigation.…”

Flow around a flexible plate in a free stream

“…These methods can be classified into two categories, depending on whether a moving mesh or fixed mesh is used. The arbitrary Lagrange-Eulerian method (ALE) [1][2][3][4] is a moving mesh type solver that reconstructs the mesh with the motion of the structure. It has high-order accuracy but can be computationally intensive according to the comlexity of boundary shape and motion.…”