Turbulence structure and unsteadiness in a separation-reattachment flow

Masaru Kiya, Kyuro Sasaki

研究成果: 書籍/レポート タイプへの寄稿会議への寄与


A wind tunnel experiment has been performed to obtain the unsteady nature of flow in a turbulent separation bubble formed at the leading edge of a blunt plate with right-angled corners. Reynolds number based on the free-stream velocity and the thickness of the plate was of the order of 10,000. The reverse-flow intermittency Ir was found to be the error function of the time-mean value of the local longitudinal velocity divided by its rms value in most of the separation bubble. This was because the longitudinal velocity fluctuation was approximately Gaussian except near the outer edge of the separated shear layer. The frequency at which the local flow changes its direction was a fairly unique function of Ir, attaining a maximum of about twice the central frequency of shedding of large-scale vortices from the reattaching zone. On the other hand, the bursting frequency in the relaxing boundary layer downstream of the separation bubble was equal to the vortex-shedding frequency. These features suggested a mechanism by which the heat-transfer rate attains a maximum near the time-mean reattachment line.
ホスト出版物のタイトルProceedings of 5th Symposium on Turbulent Shear Flows (Ithaca, NY, USA)
出版社Springer-Verlag Berlin Heidelberg
出版ステータス出版済み - 8月 7 1985

!!!All Science Journal Classification (ASJC) codes

  • 流体および伝熱


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