Overview
ABSTRACT
Low energy longitudinal vortices can be generated upstream of a laminar boundary layer by means of small roughness elements. Within the boundary layer these vortices induce alternating high and low speed regions that can stabilize the boundary layer and delay transition to turbulence. If confirmed in situations of practical interest, this effect could lead to significant reductions in viscous drag and therefore fuel consumption.
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INTRODUCTION
Low-energy longitudinal vortices can be generated upstream of a laminar boundary layer using small roughness elements. These vortices induce alternating regions of high and low velocity within the boundary layer, which can stabilize the boundary layer and delay its transition to turbulence. If confirmed in practical situations, this effect could lead to significant reductions in viscous drag and hence fuel consumption.
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Delaying transition to turbulence
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