Numerical and experimental assessment of frequencies and amplitudes when swirling excitation of bending vibrations of construction structures

Abstract

In the paper a numerical simulation of the unsteady flow around a quasi-two-dimensional stationary model based on RANS methods that are closed by the SST turbulence model was performed. After that, the amplitudes and frequencies of the aerodynamic forces were estimated, then the speed of the appearance of the resonance of the structure was searched and the amplitudes were calculated. A comparison is made with the data of experimental modeling. To eliminate the contradiction between the experimental data and the results of numerical modeling using RANS methods, oscillations were also considered within the framework of the vortex-resolving approaches LES and DES. It is shown that the technique of modeling a quasi-two-dimensional compartment allows one to quickly obtain a result that qualitatively and in order of magnitude corresponds to experimental data, but cannot provide a quantitative result. To ensure quantitative estimates, it is necessary to carry out physical modeling in wind tunnels or design studies with high spatial and temporal resolution based on modern eddy-resolving methods of computational aerodynamics.