Abstract
Most of the techniques to control laminar-turbulent transition in near-wall flows are so-called passive approaches, being quite well developed for two-dimensional flows. Favourable pressure gradients, surface cooling and heating, as well as localised boundary layer suction [1] are most well known. Riblets placed in the boundary layers have also been used to suppress formation and interaction of organised three-dimensional structures, e.g., A- and stationary vortices in the transition region [2, 3]. They are passive, since they have no means for detecting and dynamically manipulating the flow structures, i.e. a possibility to adjust the control in time and space is essentially absent. A known alternative method is the direct suppression of the two-dimensional instability waves through their linear superposition (wave cancellation). To achieve this, it is necessary to place an actuator, which effectively generates the two-dimensional waves with the same amplitudes, but with opposite phases [4-7].
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References
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Boiko, A.V., Kozlov, V.V. (1999). Strategy of the Flow Mems Control at Laminar-Turbulent Transition in a Boundary Layer. In: Meier, G.E.A., Viswanath, P.R. (eds) IUTAM Symposium on Mechanics of Passive and Active Flow Control. Fluid Mechanics and its Applications, vol 53. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4199-4_33
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DOI: https://doi.org/10.1007/978-94-011-4199-4_33
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