A method and device for creating a distribution of unsteady suction, the device may include ejectors; and a fluidic oscillator; wherein the fluidic oscillator may be configured to switch a first flow of fluid, in a cyclic manner, between the ejectors; wherein the ejectors may be fluidly coupled to the fluidic oscillator; and wherein each one of the ejectors may be configured to create pulsed suction through at least one first aperture, and (b) pulsed ejection through at least one second aperture.