Large-scale friction control in turbulent wall flow

Authors: Schlatter, P., Örlü, R., Chin, C., Hutchins, N., Monty, J.
Document Type: Conference
Pubstate: Published
Journal: Proc. 9th Turbulence Shear Flow Phenomena (TSFP-9), June 30 - July 3, 2015, The University of Melbourne, Australia
Volume: 3  
Year: 2015


The present study reconsiders the control scheme pro- posed by Schoppa & Hussain [Phys Fluids 10:1049–1051 (1998)], using new sets of numerical simulations in a turbulent channel at a friction Reynolds number of 180. In particular, it is aimed at better characterising the physics of the control as well as investigate the optimal parameters. Results indicate that a clear maximum efficiency in drag reduction is reached for the case with a viscous-scaled spanwise wavelength of the vortices of 1200, which yields a drag reduction of 18%, contrary to the smaller wavelength of 400 suggested as the most efficient vortex in Schoppa & Hussain.