Numerical and Experimental Study of Effects of Triangular Cross-Section Riblets on DU89-134 Airfoil

The research investigates the effects of triangular cross-section transverse riblets on the aerodynamic performance of the DU89-134 airfoil. The free-stream conditions are Reynolds number 500,000 and angle of attack 5°, and the riblets are positioned on the suction side at the following chordwise locations [0.3, 0.4, 0.5, 0.6, 0.7]. A comprehensive three-pronged approach includes experimental methods, RANS simulations, and implicit LES. The implicit LES method used in this study is relatively novel and demonstrates consistency with the findings from both the RANS simulations and the experimental results. Despite this alignment, no significant improvement in overall aerodynamic performance has been observed for the tested configurations.