Effects of Geometry in ۲D Simulations for Vortex-Induced Vibration of Bladeless Wind Turbines

In this study, the performance of various types of bladeless wind turbines and eddy formations are evaluated by CFD modeling. At first, a two-dimensional cylinder oscillation is simulated at Re = ۵۱۶۰۰. The results showed that the oscillation began in ۰.۲ seconds and that the system's oscillation and full eddy flow formed in ۰.۹ seconds. With a natural frequency of ۲ Hz, it is also noted that the displacement range, flow velocity, and lift coefficient variations fall within the ranges of ۰.۸, ۱-۲, and ۱-۱.۵, respectively. Secondly, four types of geometries, including circle, half-circle, half-circle-triangle, and half-circle-rectangle, are designed, and two-dimensional simulation is performed for these geometries. Significant parameters have been examined, including transversal displacement values, force drag and lift coefficients, and the vortex flow pattern formed behind these objects. It is discovered that the half-circle-triangle form has the lowest number of displacement vibrations and the maximum values of the displacement range height, velocity of the flow, and lift coefficient. The half-circle-rectangular shape had the highest frequency with a value of ۵.۷۵ Hz in comparison with the other geometries. Also, by examining the parameters mentioned in the half-circle-rectangle shape, it is found that for different Reynolds numbers, the largest response of the displacement range occurred at the lower Reynolds number, and that is the reason why the range response becomes weaker as the Reynolds number increases.

کلیدواژه ها:

bladeless wind turbine ، Vortex-Induced Vibration ، Modeling ، energy