Flow Physics over SD7062 Airfoil at Low-to-Moderate Reynolds Numbers

The present work numerically analyses the flow physics over SD7062 airfoil at low-to-moderate Reynolds numbers (Re = 1.25 × 105 and 4 × 105). Transitional shear-stress transport (SST) γ − Reθ is used to model turbulence. Two-dimensional incompressible flow simulations are conducted at angles of attack between 0°≤α≤ 20° to characterize mean aerodynamic coefficients, laminar-to-turbulent transition locations, and wake structures. The results reveal smooth stall behavior, increasing stall angle (from α = 14° to α = 15°), lift performance and aerodynamic efficiency with higher Reynolds numbers. Transition onset is found to shift toward the leading edge as the angle of attack and Reynolds number enhance. Two distinct wake regimes, steady vortex sheet and unsteady alternating vortex shedding, are observed.