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Session: Wall-bounded flows 1
Session starts: Tuesday 25 August, 10:30
Presentation starts: 10:30
Room: Room I

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Jie Gai (State of Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing, P.R. China)
Zhenhua Xia (State of Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing, P.R. China)
Qingdong Cai (State of Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing, P.R. China)

Abstract:
In this report, we conduct direct numerical simulations (DNS) of weakly spanwise-rotating plane Couette flows at Reynolds number $Re_w = U_wh/\nu= 1300$ (here, $U_w$ is the half the wall velocity difference, and $h$ is half-channel height). A series of simulations with different rotation numbers $Ro = 2\Omega h/U_w$ ($\Omega$ is constant angular velocity component in the spanwise direction) is carried out to investigate the effect of $Ro$ on the flow statistics. Our results show that the flow statistics are affected by the $Ro$, and a "critical" rotation number $Ro^*$ (between $Ro=0.01$ and $Ro=0.05$) is observed, where the kinetic energy of secondary flow contributes about a half of the turbulent kinetic energy, and the mean shear rate at the center line reaches a minimum value. We conjecture that different mechanisms should exist around $Ro^*$, and will be investigated further.