CFD Numerical Simulation of Wind and Rain Load Characteristics on Transmission Towers
In this study,the distribution characteristics of wind and rain loads on the surface of a trans-mission tower were investigated using the Euler multiphase flow method.First,the Computational Fluid Dynamics(CFD)numerical model was established based on an existing measured model of wind-driven rain,employing the Euler multiphase flow model to simulate the raindrop catch ratio on the structural surface.The simulation results were then compared with the existing measurement data to validate their accuracy.Taking a 106.6 m high steel pipe transmission tower as an example,the tower was segmented along its height based on structural characteristics to create a refined CFD model.The SST k-ω turbulence model was adopted to simulate the flow field around the transmission tower,al-lowing for the calculation of drag coefficients for each tower section and enabling comparison with ex-isting standards to confirm the accuracy of the wind field simulation.For the rain phase,the Euler mul-tiphase flow method was implemented using a User Defined Function(UDF)in Fluent.Appropriate raindrop spectra and particle sizes were selected to determine the final velocity and volume fraction of different-sized raindrops at the inlet of the computational domain.The simulation also captured the ve-locity and volume fractions of raindrops upon impact with the wall,allowing for the calculation of the wall catch ratio and wind-driven rain load.The results indicated that the simulated rain load aligned well with those obtained from formulaic methods,showing that the wind-driven rain load on the trans-mission tower increased with rainfall intensity.When the rainfall intensity was 709 mm/h,the maxi-mum along-wind rain load for each section of the transmission tower reached 5.1%of the wind load.
transmission towerwind-driven raincatch ratiowind and rain loadnumerical simulation
万方数据
维普
