Vertical rotation effect on turbulence characteristics in an open channel flow
Zou Li-Yong(邹立勇)a)† , Bai Jing-Song(柏劲松)a), Li Bu-Yang(李步阳)b),Tan Duo-Wang(谭多望)a), Li Ping(李平)a), and Liu Cang-Li(刘仓理)a)
aLaboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China; bGeneral Electric Hydro Equipment Asia Co. Ltd., Hangzhou 311231, China
Abstract This paper solves the three-dimensional Navier--Stokes equation by a fractional-step method with the Reynolds number Re$_\tau $=194 and the rotation number $N_\tau$ =0--0.12. When $N_\tau $ is less than 0.06, the turbulence statistics relevant to the spanwise velocity fluctuation are enhanced, but other statistics are suppressed. When $N_\tau $ is larger than 0.06, all the turbulence statistics decrease significantly. Reynolds stress budgets elucidate that turbulence kinetic energy in the vertical direction is transferred into the streamwise and spanwise directions. The flow structures exhibit that the bursting processes near the bottom wall are ejected toward the free surface. Evident change of near-surface streak structures of the velocity fluctuations are revealed.
Received: 16 April 2007
Revised: 07 August 2007
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 10772166 and
10672151), and the Foundation of China Academy of Engineering
Physics (Grant No 20050104).
Cite this article:
Zou Li-Yong(邹立勇), Bai Jing-Song(柏劲松), Li Bu-Yang(李步阳), Tan Duo-Wang(谭多望), Li Ping(李平), and Liu Cang-Li(刘仓理) Vertical rotation effect on turbulence characteristics in an open channel flow 2008 Chin. Phys. B 17 1034
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