On Large-Scale Friction Control in Turbulent Wall Flow in Low Reynolds Number Channels

Canton J, Orlu R, Chin C, Hutchins N, Monty J, Schlatter P (2016)

Publication Type: Journal article

Publication year: 2016

Journal

Flow Turbulence and Combustion Springer Verlag (Germany)

Book Volume: 97

Pages Range: 811-827

Journal Issue: 3

DOI: 10.1007/s10494-016-9723-8

Abstract

The present study reconsiders the control scheme proposed by Schoppa & Hussain (Phys. Fluids 10, 1049–1051 1998), using a new set of numerical simulations. The computations are performed in a turbulent channel at friction Reynolds numbers of 104 (the value employed in the original study) and 180. In particular, the aim is to better characterise the physics of the control as well as to investigate the optimal parameters. The former purpose lead to a re-design of the control strategy: moving from a numerical imposition of the mean flow to the application of a volume force. A comparison between the two is presented. Results show that the original method only gave rise to transient drag reduction. The forcing method, on the other hand, leads to sustained drag reduction, and thus shows the superiority of the forcing approach for all wavelengths investigated. 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 %, as compared to the smaller wavelength of 400 suggested as the most efficient vortex in Schoppa & Hussain. Various turbulence statistics are considered, in an effort to elucidate the causes of the drag-reducing effect. For instance, a region of negative production was found, which is quite unusual for developed turbulent channel flow.

Authors with CRIS profile

Philipp Schlatter

Involved external institutions

Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH) SE Sweden (SE) The University of Melbourne AU Australia (AU)

How to cite

APA:

Canton, J., Orlu, R., Chin, C., Hutchins, N., Monty, J., & Schlatter, P. (2016). On Large-Scale Friction Control in Turbulent Wall Flow in Low Reynolds Number Channels. Flow Turbulence and Combustion, 97(3), 811-827. https://doi.org/10.1007/s10494-016-9723-8

MLA:

Canton, Jacopo, et al. "On Large-Scale Friction Control in Turbulent Wall Flow in Low Reynolds Number Channels." Flow Turbulence and Combustion 97.3 (2016): 811-827.

BibTeX: Download