Direct Numerical Simulation of Spanwise
Rotating Channel Flow and Heat Transfer
Li Guangxi,Tao Wenquan,Li Zengyao,Yu Bo
(State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University,
Xi'an 710049, China)
Abstract: The effects of spanwise rotation on the turbulent channel flow and heat
transfer were examined with direct numerical simulation (DNS). The unsteady N-S equations
were discretized by finite difference method. The Reynolds number based on half channel
width and friction velocity and the Prandtl number were set to be 150 and 0.71,
respectively. Grid number was 64¡Á128¡Á64. Our computational results indicate that the
turbulent intensity increased and heat transfer is enhanced at the pressure side with
increasing rotation number, while heat transfer is suppressed at the suction side.
Moreover,the rotation terms in the Reynolds stress transport equations play more important
role in the redistribution of energy among different direction than the
pressure-redistribution terms, and they change drastically the budget of Reynolds stress
equations. In addition, in the pressure side, the effect of Coriolis force makes the
low-speed streaks slenderer and the space between streaks smaller, and in the suction
side, streaks almost disappear and the flow has the tendency to become laminar.
Keywords: turbulence; direct numerical simulation; rotation