Direct Numerical Simulation of Turbulent Channel Flow with Spanwise System Rotation and Velocity Slip on Suction Wall

Moosaie, A.; Najafi-Kashkooli, Zh.; Andersson, H. I.

doi:10.47176/jafm.18.11.3425

Direct Numerical Simulation of Turbulent Channel Flow with Spanwise System Rotation and Velocity Slip on Suction Wall

Document Type : Regular Article

Authors

¹ Department of Mechanical Engineering, Yasouj University, Yasouj 75918-74934, Iran

² Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran

³ Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, Norway

10.47176/jafm.18.11.3425

Abstract

Direct numerical simulations are conducted to investigate the turbulent flow of an incompressible Newtonian fluid in a channel at a fully-developed state. The channel rotates steadily around its spanwise axis. A hydrophobic coating on the suction side introduces the velocity slip, while the pressure side maintains a no-slip boundary condition. Flow statistics are reported for different slip intensities, considering both rotating and stationary channel cases. Two main sources of asymmetry relative to the channel centerline are identified: slip at the suction wall and rotational effects. Results show that a linear region forms in the mean velocity profile of the rotating channel with slip, similar to the no-slip case, and this linear region widens as the rotation number increases. Distributions of velocity fluctuation RMS values and Reynolds shear stress are presented and analyzed for various conditions. Additionally, the structure of near-wall streaks and the evolution of instantaneous streamwise vorticity are examined.

Keywords

Main Subjects

Turbulent Flows

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