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
“…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%
“…Computations have been performed in a three-dimensional confined domain (similar to the experimental one of Burgmann and Schröder [35]) for Reynolds numbers ranging from Re = 5000 (laminar) up to Re = 20 000 (transitional). The effect of an increase of the Reynolds number is shown in Fig.…”
Section: Influence Of the Reynolds Numbermentioning
confidence: 99%
“…14(b). Table 2 provides the characteristics of the LSB along with comparisons against two sets of measurements from Burgmann et al [18] and Burgmann and Schröder [35]. 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.…”
Section: This Is Confirmed By the Skin Friction Coefficient Along Thementioning
confidence: 99%
“…As long as the reattachment point is concerned, full reattachment is observed at the trailing edge (x/c = 1), which was also found by the experiments of Olson et al [20] and recently by Nati et al [21] for a higher Reynolds number (Re = 30 000). Olson et al [20] have also compared their results with Burgmann and Schröder [35] and Burgmann et al [18]. They explain the discrepancies in the LSB characterization by uncertainties due to determination of the angle of attack, to uncertainties due to near-wall measurement resolution, as well as the sensitivity to the Reynolds number and the effects of free-stream turbulence.…”
Section: This Is Confirmed By the Skin Friction Coefficient Along Thementioning
“…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%
“…Computations have been performed in a three-dimensional confined domain (similar to the experimental one of Burgmann and Schröder [35]) for Reynolds numbers ranging from Re = 5000 (laminar) up to Re = 20 000 (transitional). The effect of an increase of the Reynolds number is shown in Fig.…”
Section: Influence Of the Reynolds Numbermentioning
confidence: 99%
“…14(b). Table 2 provides the characteristics of the LSB along with comparisons against two sets of measurements from Burgmann et al [18] and Burgmann and Schröder [35]. 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.…”
Section: This Is Confirmed By the Skin Friction Coefficient Along Thementioning
confidence: 99%
“…As long as the reattachment point is concerned, full reattachment is observed at the trailing edge (x/c = 1), which was also found by the experiments of Olson et al [20] and recently by Nati et al [21] for a higher Reynolds number (Re = 30 000). Olson et al [20] have also compared their results with Burgmann and Schröder [35] and Burgmann et al [18]. They explain the discrepancies in the LSB characterization by uncertainties due to determination of the angle of attack, to uncertainties due to near-wall measurement resolution, as well as the sensitivity to the Reynolds number and the effects of free-stream turbulence.…”
Section: This Is Confirmed By the Skin Friction Coefficient Along Thementioning
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