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Technical Brief

On the Anisotropic Vorticity in Turbulent Channel Flows

[+] Author and Article Information
Helge I. Andersson

Department of Energy and Process Engineering,
Norwegian University of Science and Technology,
Trondheim 7491, Norway

Lihao Zhao

Department of Energy and Process Engineering,
Norwegian University of Science and Technology,
Trondheim 7491, Norway
e-mail: lihao.zhao@ntnu.no

Evan A. Variano

Department of Civil and Environmental Engineering,
University of California, Berkeley,
Berkeley, CA 94720

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received June 10, 2014; final manuscript received February 24, 2015; published online April 28, 2015. Assoc. Editor: Sharath S. Girimaji.

J. Fluids Eng 137(8), 084503 (Aug 01, 2015) (3 pages) Paper No: FE-14-1305; doi: 10.1115/1.4030003 History: Received June 10, 2014; Revised February 24, 2015; Online April 28, 2015

Revisiting the fluctuating vorticity field in the centerplane of a turbulent channel flow, we show that the vorticity is distinctly anisotropic at low Reynolds numbers (Re). This result is in contrast with some earlier conclusions. The anisotropy is a function of Re, and we have compiled data to show that the anisotropy gradually vanishes with increasing Re. Acknowledging the anisotropy is important for current efforts on simulating turbulent particle suspensions.

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References

Figures

Grahic Jump Location
Fig. 1

RMS vorticity fluctuations, normalized as RMS (ωi') ν/uτ2 and plotted against wall coordinate yuτ/ν for Reτ = 180. The symbols are DNS data from Moser et al. [6] and the lines are our own recent DNS data.

Grahic Jump Location
Fig. 2

PDF of ωi' for Reτ = 180. Streamwise vorticity fluctuations ωx' (—), wall-normal vorticy fluctuations ωy' (- - - - -), and spanwise vorticity fluctuations ωz' (-.-.-).

Grahic Jump Location
Fig. 3

Variation of the anisotropy parameter A with Reτ. Present DNS data for Reτ = 180 compared with data from DNSs by Imamoto et al. [12], Moser et al. [6], and del Álamo and Jiménez [13].

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