A method for controlling turbulence in boundary layer or other wall-bounded fluid flow fields (10) having a turbulent wall region (12) characterized by a system of roll pairs (14, 16) or streaks whose diameter is functionally related to the strength of the flow, and which extend in the direction of flow, and by propagating structures of coherent patterns that propagate obliquely to the direction of flow at a substantially constant group speed, said method including using a linear, or two dimensional array of fine-scale mechanical systems capable of controlled mechanical motion to introduce into the turbulent wall region distrurbances that are effective in said region to produce a composite disturbance field having a component due to the static presence of said systems and a component due to their controlled mechanical motion, said composite field being strongly coupled to and modifying the obliquely propagating structures in a manner that increases or decreases the interaction of the propagating structure with the system of roll pairs for locally increasing or decreasing the turbulence in the flow field. 980 י" ב בסיון התשס" ד - June 1, 2004
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