Turbofan gas turbine engine aerodynamic mixer

A mixer for a turbofan engine (100) includes a centerbody (144) and a mixer nozzle (146). The mixer nozzle (146) surrounds at least a portion of the centerbody (144) and is spaced apart to define a core flow path between the mixer nozzle (146) and the centerbody (144). The mixer nozzle (146) is configured, when bypass air flows through the turbofan engine (100), to direct at least a portion of the bypass air to impinge on the centerbody (144). The mixer nozzle (146) includes a plurality of circumferentially spaced mixer lobes (206) that extend axially in a rearward direction and have a cross-section shape defined by a set of equations.