The present invention provides a method of and apparatus for, reducing noise caused by the interaction of airflow between two bluff bodies which are in a generally tandem arrangement, the method comprising providing flow control such that the peak turbulence is at least partially displaced from, or reduced at, the surface of the downstream body. The invention also provides an aircraft noise reduction device, and a method of using such a device, comprising a flow control apparatus (2) arranged to be positioned downstream of a flow-facing element (1), wherein the flow control apparatus is arranged, in use, to reduce noise induced by unsteady flow downstream of the flow-facing element, and wherein the flow control apparatus (2) is arranged to be moveable in relation to the flow-facing element (1) between a stowed position and a deployed position.
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