2009
DOI: 10.1007/978-3-642-01106-1_9
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Time-Resolved Two- and Three-Dimensional Measurements of Transitional Separation Bubbles

Abstract: Abstract. Advanced methods of the Particle-Image Velocimetry (PIV) technique such as Time-Resolved and Stereo-Scanning PIV have been applied to investigate the separation bubbles on top of a finite circular cylinder and on the suction side of an SD7003 airfoil. A kind of three-dimensional vortex-shedding mechanism associated with the inviscid Kelvin-Helmholtz-instability has been identified to govern the flow field in both cases. The time-averaged velocity distribution is strongly affected by these vortex casc… Show more

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Cited by 1 publication
(6 citation statements)
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“…Separation (x s ) and reattachment (x r ) points are determined with the null skin friction coefficient, while the length of the LSB (l s ) is defined as the distance between those two points and its height (h s ) as the maximum height obtained by the δ 99 criterion. The present computation agrees well with experiments of Burgmann and Schröder [35]. Though the separation point is slightly advanced, the LSB length and height are within the range of the experimental values.…”
Section: This Is Confirmed By the Skin Friction Coefficient Along Thesupporting
confidence: 91%
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“…Separation (x s ) and reattachment (x r ) points are determined with the null skin friction coefficient, while the length of the LSB (l s ) is defined as the distance between those two points and its height (h s ) as the maximum height obtained by the δ 99 criterion. The present computation agrees well with experiments of Burgmann and Schröder [35]. Though the separation point is slightly advanced, the LSB length and height are within the range of the experimental values.…”
Section: This Is Confirmed By the Skin Friction Coefficient Along Thesupporting
confidence: 91%
“…While the previous validation considered an infinite twodimensional domain, the investigation of the transition at Re = 20 000 is performed using a three-dimensional confined domain. Hence, in order to identify the effect of confinement, a comparison between the flow at Re = 10 000 in the two-dimensional infinite domain and the one in the three-dimensional confined domain, similar to the experimental one used by Burgmann and Schröder [35], is presented. Fig.…”
Section: Influence Of the Vertical Confinementmentioning
confidence: 99%
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