A computational investigation was carried out to study and determine the aerodynamics and aeroacoustics of an Airbus A320Â´s flap side-edge. A detached eddy simulation was performed on geometry that was based upon the airfoil of the flap; in order to understand the flowfield and furthermore develop a future mathematical model that would describe the generation of aircraft on the noise in the flap side-edge. One main source of vorticity in the flowfield was identified from the computational research; the flap side-edge vortical system. This source of vorticity interacted to produce a significantly unsteady flowfield above the solid flap surface. One potential acoustic source on the flap was identified. This was a turbulent shear layer that rolled up to form the flap side-edge vortex, reattaching firstly on the side-edge and secondly on the suction surface of the flap. Measurements taken as part of the computational study were forces, on-surface pressures, sound pressure levels and a vectors simulation were performed to visualise the on-surface flow.