The main subject of this work is the numerical study control of flow separation on a NACA 23015 airfoil by using wing cuff. This last is a leading edge modification done to the wing. The modification consists of a slight extension of the chord on the outboard section of the wings. https://www.diegojavierfares.com/super-super-Scratch-Dent-Sandusky-30-Steel-Storage-Cabinet-With-3-Fixed-Shelves-Putty-hot-choice/