TY - GEN
T1 - Wall-turbulence structure with pressure gradient around 2D hump
AU - Yakeno, Aiko
AU - Kawai, Soshi
AU - Nonomura, Taku
AU - Fujii, Kozo
N1 - Publisher Copyright:
© Springer International Publishing Switzerland 2016.
PY - 2016
Y1 - 2016
N2 - Direct numerical simulation around a two-dimensional hump shape is conducted at the Reynolds number Reh = 16, 000, based on the hump height. We investigate wall-turbulence structures around the hump in order to predict and control them to suppress separation. At this Reynolds number, specific striped wall-turbulence structure appears at the leading-edge near the wall surface. Its spanwise length-scale is close to that of the streak in a fully-developed turbulent channel flow. That is λy = 0.08 scaled with the hump height, which corresponds to λ+ y = 150 in the local viscous unit. We identify two more different spanwise-correlated scales, λy = 0.40 and 0.13 around the hump. Spanwise length-scale of λy = 0.40 is around λ+ y = 600. On the other hand, the other scale λy = 0.13 is not dependent on the local viscous scale.
AB - Direct numerical simulation around a two-dimensional hump shape is conducted at the Reynolds number Reh = 16, 000, based on the hump height. We investigate wall-turbulence structures around the hump in order to predict and control them to suppress separation. At this Reynolds number, specific striped wall-turbulence structure appears at the leading-edge near the wall surface. Its spanwise length-scale is close to that of the streak in a fully-developed turbulent channel flow. That is λy = 0.08 scaled with the hump height, which corresponds to λ+ y = 150 in the local viscous unit. We identify two more different spanwise-correlated scales, λy = 0.40 and 0.13 around the hump. Spanwise length-scale of λy = 0.40 is around λ+ y = 600. On the other hand, the other scale λy = 0.13 is not dependent on the local viscous scale.
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U2 - 10.1007/978-3-319-29130-7_30
DO - 10.1007/978-3-319-29130-7_30
M3 - Conference contribution
AN - SCOPUS:84967154646
SN - 9783319291291
T3 - Springer Proceedings in Physics
SP - 167
EP - 171
BT - Progress in Turbulence VI - Proceedings of the iTi Conference on Turbulence 2014
A2 - Talamelli, Alessandro
A2 - Peinke, Joachim
A2 - Kampers, Gerrit
A2 - Oberlack, Martin
A2 - Wacławczyk, Marta
PB - Springer Science and Business Media, LLC
T2 - 6th International Conference on Progress in Turbulence, iTi 2014
Y2 - 29 August 2014 through 29 August 2014
ER -