In a transitional boundary layer subjected to free-stream turbulence, streaky structures develop and eventually break down to turbulence after wavy motions. The purpose of the present study is to reveal the dominant scales of the streaky structures using a novel stereo PTV system measuring the streamwise and wall-normal velocities. The correlation of the streamwise velocity exhibit a negative peak at a certain spanwise separation. If normalized with the local boundary layer thickness, the spanwise separation minimizing the correlation decreases downstream and reaches the boundary layer thickness at the most downstream position. The streamwise correlation coefficient is asymptotically decreasing to zero and the streamwise integral scales are increasing downstream, indicating the large streamwise elongation of the streaky structure. The normalized spanwise scale of the wall-normal disturbance velocity also decreases downstream and it is always narrower than the width of the disturbances of the streamwise velocity. In contrast to the elongating streamwise velocity disturbance, the integral scale in the streamwise direction of the wall-normal disturbance is constant with downstream position. The length scales of the wall-normal disturbance are more less constant with the streamwise position and this result concludes that the wall-normal disturbance is simply convected by the mean flow after the receptivity process.
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ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference
July 6–10, 2003
Honolulu, Hawaii, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-3696-7
PROCEEDINGS PAPER
Generation Mechanism of Streaky Structure in Natural Transition Available to Purchase
Ayumu Inasawa,
Ayumu Inasawa
Tohoku University, Sendai, Japan
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Masaharu Matsubara,
Masaharu Matsubara
Shinshu University, Nagano, Japan
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Yasuaki Kohama
Yasuaki Kohama
Tohoku University, Sendai, Japan
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Ayumu Inasawa
Tohoku University, Sendai, Japan
Fredrik Lundell
KTH, Stockholm, Sweden
Masaharu Matsubara
Shinshu University, Nagano, Japan
P. H. Alfredsson
KTH, Stockholm, Sweden
Yasuaki Kohama
Tohoku University, Sendai, Japan
Paper No:
FEDSM2003-45231, pp. 2681-2688; 8 pages
Published Online:
February 4, 2009
Citation
Inasawa, A, Lundell, F, Matsubara, M, Alfredsson, PH, & Kohama, Y. "Generation Mechanism of Streaky Structure in Natural Transition." Proceedings of the ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. Volume 1: Fora, Parts A, B, C, and D. Honolulu, Hawaii, USA. July 6–10, 2003. pp. 2681-2688. ASME. https://doi.org/10.1115/FEDSM2003-45231
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