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**Harvard**

Altintas, A. och Davidson, L. (2017) *Direct numerical simulation analysis of spanwise oscillating Lorentz force in turbulent channel flow at low Reynolds number*.

** BibTeX **

@article{

Altintas2017,

author={Altintas, Atilla and Davidson, Lars},

title={Direct numerical simulation analysis of spanwise oscillating Lorentz force in turbulent channel flow at low Reynolds number},

journal={Acta Mechanica},

issn={0001-5970},

volume={228},

issue={4},

pages={1269-1286},

abstract={Direct numerical simulations of a turbulent channel flow at low Reynolds number ($Re_{\tau} = 180$, based on the driving pressure gradient and channel half width) are performed. Some results are also presented for $Re_{\tau} = 400$. In this work we apply an idealized spanwise Lorentz force near the lower wall of the channel and compared the results for the applied force and no-force cases in both the upper half and the lower half of the channel. We have studied two-point correlations to explain the effect of the Lorentz force on streamwise vortices and streaky structures. Despite the observation of the clear stabilization of the streaky structures in the vicinity of the wall, the existence of the streamwise vortices is explained by the well-known turbulence regeneration cycle, which improves the understanding of streaky and streamwise vortex structure formation on turbulence generation. Spanwise oscillating Lorentz force effects on the Rankine vortex structures are investigated. Our results lead us to establish an explanation on the effect of sweep and ejection events on the mean vortex structures in the flow field. A mean vortex structure is defined by the time-averaged location of the local minimum and maximum of the streamwise r.m.s. vorticity. We also depict turbulence production rates for both cases and compared the lower and upper half of the channel.},

year={2017},

keywords={Lorentz force, drag reduction, EMHD, streaks, Rankine vortex},

}

** RefWorks **

RT Journal Article

SR Electronic

ID 245839

A1 Altintas, Atilla

A1 Davidson, Lars

T1 Direct numerical simulation analysis of spanwise oscillating Lorentz force in turbulent channel flow at low Reynolds number

YR 2017

JF Acta Mechanica

SN 0001-5970

VO 228

IS 4

SP 1269

OP 1286

AB Direct numerical simulations of a turbulent channel flow at low Reynolds number ($Re_{\tau} = 180$, based on the driving pressure gradient and channel half width) are performed. Some results are also presented for $Re_{\tau} = 400$. In this work we apply an idealized spanwise Lorentz force near the lower wall of the channel and compared the results for the applied force and no-force cases in both the upper half and the lower half of the channel. We have studied two-point correlations to explain the effect of the Lorentz force on streamwise vortices and streaky structures. Despite the observation of the clear stabilization of the streaky structures in the vicinity of the wall, the existence of the streamwise vortices is explained by the well-known turbulence regeneration cycle, which improves the understanding of streaky and streamwise vortex structure formation on turbulence generation. Spanwise oscillating Lorentz force effects on the Rankine vortex structures are investigated. Our results lead us to establish an explanation on the effect of sweep and ejection events on the mean vortex structures in the flow field. A mean vortex structure is defined by the time-averaged location of the local minimum and maximum of the streamwise r.m.s. vorticity. We also depict turbulence production rates for both cases and compared the lower and upper half of the channel.

LA eng

DO 10.1007/s00707-016-1754-7

LK http://dx.doi.org/10.1007/s00707-016-1754-7

LK http://publications.lib.chalmers.se/records/fulltext/245839/local_245839.pdf

OL 30