Control of a separating boundary layer with travelling waves on the wall
2011 (English)Report (Other academic)
We perform numerical simulations of control of a separating laminar boundary layer by means of blowing and suction at the wall in the form of traveling waves. Separation is imposed by prescribing accelerating and decelerating free-stream velocity for the flow over a flat plate. We find that downstream traveling waves already at very low amplitudes are able to eliminate the separation and induce a turbulent but attached boundary layer flow. Upstream traveling waves of relatively higher amplitudes only slightly reduce separation while keeping the flow laminar. The amplitude of the blowing/suction needed to achieve such significant effects are considerably smaller than those previously considered for drag reduction and transition delay in plane geometries.
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology , 2011. , 14 p.
Other Materials Engineering
IdentifiersURN: urn:nbn:se:kth:diva-33797OAI: oai:DiVA.org:kth-33797DiVA: diva2:417770
QC 201105182011-05-182011-05-182011-05-18Bibliographically approved