caa a22 4500 477093493 CHVBK 20180405111521.0 cr unu---uuuuu 170330e19961101xx s 000 0 eng 10.1007/BF00189044 doi (NATIONALLICENCE)springer-10.1007/BF00189044 Control of turbulent separated flow over a backward-facing step by local forcing [Elektronische Daten] [K. Chun, H. Sung] An experimental study was made of the flow over a backward-facing step. Excitations were given to separated flow by means of a sinusoidally oscillating jet issuing from a thin slit near the separation line. The Reynolds number based on the step height (H) varied 13000 ⩽ Re H ⩽ 33000. Effect of local forcing on the flow structure was scrutinized by altering the forcing amplitude (0 ⩽ A 0 ⩽ 0.07) and forcing frequency (0 ⩽ St H ⩽ 5.0). Small localized forcing near the separation edge enhanced the shear-layer growth rate and produced a large roll-up vortex at the separation edge. A large vortex in the shear layer gave rise to a higher rate of entrainment, which lead to a reduction in reattachment length as compared to the unforced flow. The normalized minimum reattachment length (x r )min/x x0 was obtained at St θ ≅ 0.01. The most effective forcing frequency was found to be comparable to the shedding frequency of the separated shear layer. Springer-Verlag, 1996 Chun K. Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-ku, 305-701, Taejon, Korea aut Sung H. Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-ku, 305-701, Taejon, Korea aut Experiments in Fluids Springer-Verlag 21/6(1996-11-01), 417-426 0723-4864 21:6<417 1996 21 348 https://doi.org/10.1007/BF00189044 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00189044 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chun K. Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-ku, 305-701, Taejon, Korea aut NATIONALLICENCE 700 1- Sung H. Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-ku, 305-701, Taejon, Korea aut NATIONALLICENCE 773 0- Experiments in Fluids Springer-Verlag 21/6(1996-11-01), 417-426 0723-4864 21:6<417 1996 21 348 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer