Reynolds number dependence of large-scale friction control in turbulent channel flow
Jacopo Canton, Ramis Orlu, Cheng Chin, Philipp Schlatter
Physical Review Fluids | AMER PHYSICAL SOC | Published : 2016
The present work investigates the effectiveness of the control strategy introduced by Schoppa and Hussain [Phys. Fluids 10, 1049 (1998)PHFLE61070-663110.1063/1.869789] as a function of Reynolds number (Re). The skin-friction drag reduction method proposed by these authors, consisting of streamwise-invariant, counter-rotating vortices, was analyzed by Canton et al. [Flow, Turbul. Combust. 97, 811 (2016)1386-618410.1007/s10494-016-9723-8] in turbulent channel flows for friction Reynolds numbers (Reτ) corresponding to the value of the original study (i.e., 104) and 180. For these Re, a slightly modified version of the method proved to be successful and was capable of providing a drag reduction ..View full abstract
Financial support by the Swedish Research Council (VR) is gratefully acknowledged. Computer time was provided by the Swedish National Infrastructure for Computing (SNIC). P.S. acknowledges financial support by the Wallenberg Foundation as part of the Wallenberg Academy Fellow Programme, and R.O. acknowledges support from the Lundeqvist Foundation.