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Decay of turbulence in a liquid metal duct flow with transverse magnetic field

Published online by Cambridge University Press:  26 March 2019

Oleg Zikanov Open the ORCID record for Oleg Zikanov [Opens in a new window] ,
Dmitry Krasnov ,
Thomas Boeck  and
Semion Sukoriansky
Oleg Zikanov*
Affiliation:
Department of Mechanical Engineering, University of Michigan, Dearborn, MI 48128-1491, USA
Dmitry Krasnov
Affiliation:
Institute for Thermodynamics and Fluid Mechanics, Technische Universität Ilmenau, PO Box 100565, D-98684 Ilmenau, Germany
Thomas Boeck
Affiliation:
Institute for Thermodynamics and Fluid Mechanics, Technische Universität Ilmenau, PO Box 100565, D-98684 Ilmenau, Germany
Semion Sukoriansky
Affiliation:
Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel
*
†Email address for correspondence: zikanov@umich.edu
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Abstract

Decay of honeycomb-generated turbulence in a duct with a static transverse magnetic field is studied via direct numerical simulations. The simulations follow the revealing experimental study of Sukoriansky et al. (Exp. Fluids, vol. 4 (1), 1986, pp. 11–16), in particular the paradoxical observation of high-amplitude velocity fluctuations, which exist in the downstream portion of the flow when the strong transverse magnetic field is imposed in the entire duct including the honeycomb exit, but not in other configurations. It is shown that the fluctuations are caused by the large-scale quasi-two-dimensional structures forming in the flow at the initial stages of the decay and surviving the magnetic suppression. Statistical turbulence properties, such as the energy decay curves, two-point correlations and typical length scales are computed. The study demonstrates that turbulence decay in the presence of a magnetic field is a complex phenomenon critically depending on the state of the flow at the moment the field is introduced.

JFM classification

MHD and Electrohydrodynamics: High-Hartmann-number flows MHD and Electrohydrodynamics: MHD turbulence Turbulent Flows: Turbulence simulation
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 867 , 25 May 2019 , pp. 661 - 690
Copyright
© 2019 Cambridge University Press 

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