A comparison of opposition control in turbulent boundary layer and turbulent channel flow

Stroh A, Frohnapfel B, Schlatter P, Hasegawa Y (2015)

Publication Type: Journal article

Publication year: 2015

Journal

Physics of Fluids American Institute of Physics (AIP)

Book Volume: 27

Article Number: 075101

Journal Issue: 7

DOI: 10.1063/1.4923234

Abstract

A comparison between classical opposition control applied in the configuration of a fully developed turbulent channel flow and applied locally in a spatially developing turbulent boundary layer is presented. It is found that the control scheme yields similar drag reduction rates if compared at the same friction Reynolds numbers. However, a detailed analysis of the dynamical contributions to the skin friction coefficient reveals significant differences in the mechanism behind the drag reduction. While drag reduction in turbulent channel flow is entirely based on the attenuation of the Reynolds shear stress, the modification of the spatial flow development is essential for the turbulent boundary layer in terms of achievable drag reduction. It is shown that drag reduction due to this spatial development contribution becomes more pronounced with increasing Reynolds number (up to Reτ = 660, based on friction velocity and boundary layer thickness) and even exceeds drag reduction due to attenuation of the Reynolds shear stress. In terms of an overall energy balance, it is found that opposition control is less efficient in the turbulent boundary layer due to the inherently larger fluctuation intensities in the near wall region.

Authors with CRIS profile

Philipp Schlatter

Involved external institutions

Karlsruhe Institute of Technology (KIT) DE Germany (DE) Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH) SE Sweden (SE) University of Tokyo JP Japan (JP)

How to cite

APA:

Stroh, A., Frohnapfel, B., Schlatter, P., & Hasegawa, Y. (2015). A comparison of opposition control in turbulent boundary layer and turbulent channel flow. Physics of Fluids, 27(7). https://dx.doi.org/10.1063/1.4923234

MLA:

Stroh, Alexander, et al. "A comparison of opposition control in turbulent boundary layer and turbulent channel flow." Physics of Fluids 27.7 (2015).

BibTeX: Download