Control of the secondary crossflow instability: Direct numerical simulations of localized suction in three-dimensional boundary layers
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Numerical Simulation of Crossflow-Transition Control using Pinpoint Suction
Laminar-turbulent transition in swept-wing boundary layers is typically caused by secondary instabilities of steady crossflow vortices (CFVs). So far, suction for laminar flow control (LFC) in three-dimensional boundary layers has been applied to reduce the crossflow and thus the growth of the primary CFV modes to CFVs. We investigate the influence of strong, localized suction (pinpoint suction...
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Results of high-order direct numerical simulations are summarized for the evolution of crossflow disturbances in incompressible wing-generic boundary-layers with suction at the wall. The concept of smart suction, an adapted combination of the upstream-flow-deformation (UFD) technique and suction, is presented for laminar flow control. In the UFD technique, relatively tightly spaced, useful cros...
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Direct numerical simulations are employed to investigate the effects of discrete suction orifices at the wall on the disturbance evolution in laminar three-dimensional boundary-layer flows with favourable pressure gradient. Suction panels with many suction orifices can excite unstable crossflow (CF) modes even if the orifice spacing is smaller than the chordwise/spanwise wavelengths of unstable...
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Laminar-turbulent breakdown in a swept-wing boundary layer is typically caused by secondary instabilities of steady crossflow vortices (CFVs). So far, boundary-layer suction for laminar flow control in three-dimensional boundary layers has been applied to reduce the crossflow and thus the growth of the primary vortices only. We investigate the influence of strong, localized suction (pinpoint su...
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The influence of localized blowing and suction on the secondary instability of highamplitude crossflow vortices (CFVs) has been investigated by means of direct numerical simulations (DNS). The growth of artificially excited high-frequency disturbances is significantly attenuated or even neutralized by blowing or suction at the wall. Two different effects have been found during the investigation...
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