Effects of Vertical Position and Orientation on a Vortical-Gust/Airfoil Interaction at a Transitional Reynolds Number

摘要

This article presents high-fidelity implicit large eddy simulations (ILES) of parallel vortical gust interactions with a NACA0012 airfoil operating at a transitional Reynolds number of Re_c = 200,000 and an angle of attack of α = 4°. The gust is supplied upstream of the airfoil as a Taylor vortex. Three different initial vertical positions are considered for a counterclockwise-oriented gust as well as one vertical position for a clockwise-oriented gust. In all cases, the unsteady flow is explored in detail elucidating characteristic behaviors and their effects on aerodynamic loading. Both the upper and lower surface boundary layers are shown to produce a very different response and recovery depending on the vertical position or orientation of the incoming gust. Acoustic sources specific to gust-induced viscous flow events and common to either gust orientation are identified and merit further study.