Turbulent-laminar coexistence in wall flows with Coriolis, buoyancy or Lorentz forces

Brethouwer G, Duguet Y, Schlatter P (2012)

Publication Type: Journal article

Publication year: 2012

Journal

Journal of Fluid Mechanics Cambridge University Press (CUP)

Book Volume: 704

Pages Range: 137-172

DOI: 10.1017/jfm.2012.224

Abstract

Direct numerical simulations of subcritical rotating, stratified and magneto-hydrodynamic wall-bounded flows are performed in large computational domains, focusing on parameters where laminar and turbulent flow can stably coexist. In most cases, a regime of large-scale oblique laminar-turbulent patterns is identified at the onset of transition, as in the case of pure shear flows. The current study indicates that this oblique regime can be shifted up to large values of the Reynolds number Re by increasing the damping by the Coriolis, buoyancy or Lorentz force. We show evidence for this phenomenon in three distinct flow cases: plane Couette flow with spanwise cyclonic rotation, plane magnetohydrodynamic channel flow with a spanwise or wall-normal magnetic field, and open channel flow under stable stratification. Near-wall turbulence structures inside the turbulent patterns are invariably found to scale in terms of viscous wall units as in the fully turbulent case, while the patterns themselves remain large-scale with a trend towards shorter wavelength for increasing Re. Two distinct regimes are identified: at low Reynolds numbers the patterns extend from one wall to the other, while at large Reynolds number they are confined to the near-wall regions and the patterns on both channel sides are uncorrelated, the core of the flow being highly turbulent without any dominant large-scale structure. © 2012 Cambridge University Press.

Authors with CRIS profile

Philipp Schlatter

Involved external institutions

Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH) SE Sweden (SE) University of Paris 11 - Paris-Sud / Université Paris XI Paris-Sud FR France (FR)

How to cite

APA:

Brethouwer, G., Duguet, Y., & Schlatter, P. (2012). Turbulent-laminar coexistence in wall flows with Coriolis, buoyancy or Lorentz forces. Journal of Fluid Mechanics, 704, 137-172. https://doi.org/10.1017/jfm.2012.224

MLA:

Brethouwer, G., Y. Duguet, and Philipp Schlatter. "Turbulent-laminar coexistence in wall flows with Coriolis, buoyancy or Lorentz forces." Journal of Fluid Mechanics 704 (2012): 137-172.

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