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Direct numerical simulations are used to investigate the generation and growth of disturbances in the near-and far-wake of a distributed roughness. Particular emphasis is placed on the interaction of disturbances induced due to the tallest portions of the roughness. It is observed that the disturbances may constructively or destructively interfere with each other depending on the relative orientation of the tallest regions of the roughness in close vicinity and that such interference affects the location of laminar-turbulent transition. This behavior is investigated in detail by considering the interaction of disturbances induced due to two discrete elements with varying orientation.

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