Aerodynamic mechanism of transversely inclined prisms under various wind attack angles

In this study, we conducted wind tunnel experiments to acquire the aerodynamic characteristics of transversely inclined structures featuring varying transverse inclination angles, different wind attack angles, and distinct inflow patterns (clockwise and anti-clockwise inflow). High-fidelity large eddy simulation (LES) investigations are employed to visualize the flow field comprehensively. A thorough quantitative analysis is conducted on multiple aspects, including the mean pressure coefficient, local force coefficient, generalized force spectrum, and point spectrum of the structure. Through this analysis, the aerodynamic mechanisms governing transversely inclined structures are elucidated by examining the distribution of the time-averaged flow field and spanwise vortex. The results reveal that transverse inclination restricts the available fluid space, thereby affecting the formation of the horseshoe vortex at the fixed end. Depending on the various wind attack angles, contrasting inflow patterns induce entirely different flow behaviors. Specifically, positive attack angles lead to the maximum curvature of the shear layer occurring, whereas a negative attack angle positions the maximum curvature at the free end. The primary reason for the deviation in the predicted response of the transversely inclined structure is the suppression of vortex shedding due to the end effect under the negative angle of attack condition.