Aerodynamic response of a π-shaped beam under different turbulent inflow flows

This study generated three types of turbulence fields in a wind tunnel by changing the size of grid holes and grid plates. The buffeting force characteristics of the main beam under different turbulent flow fields are discussed. In addition, the narrowband synthetic random flow generation (NSRFG) turbulent inlet method was used to conduct large eddy simulation (LES) of -shaped beam under different turbulent inflow flows-shaped beams. This study presents a grid generation strategy for LES based on the NSRFG, discusses the horizontal decay law of turbulent wind parameters, and provides a method for setting inlet turbulent wind parameters. Finally, proper orthogonal decomposition (POD) was carried out by extracting the numerical simulation data of key parts around the main beam, and the influence mechanism of the turbulent wind parameters on the buffeting force was discussed. The results indicate that the mean wind speed and turbulence intensity have relatively small effects on the horizontal decay function of the turbulence parameters. By contrast, the turbulent integral scale has a significant impact on the horizontal decay function of the turbulent wind parameters. Turbulence parameters can change the intensity, position, and shape of the vortices around the model, thereby altering its surface pressure.