THERMAL SCIENCE

International Scientific Journal

Johannes Wölck

,

Gunther Brenner

LARGE-EDDY-SIMULATION OF TURBULENT MAGNETOHYDRODYNAMIC FLOWS

ABSTRACT
A magnetohydrodynamic turbulent channel flow under the influence of a wallnormal magnetic field is investigated using the Large-Eddy-Simulation technique and k-equation subgrid-scale-model. Therefore, the new solver MHDpisoFoam is implemented in the OpenFOAM CFD-Code. The temporal decay of an initial turbulent field for different magnetic parameters is investigated. The rms values of the averaged velocity fluctuations show a similar, trend for each coordinate direction. 80% of the fluctuations are damped out in the range between 0 < Ha < < 75 at Re = 6675. The trend can be approximated via an exponential of the form exp(−a·Ha), where a is a scaling parameter. At higher Hartmann numbers the fluctuations decrease in an almost linear way. Therefore, the results of this study show that it may be possible to construct a general law for the turbulence damping due to action of magnetic fields.
KEYWORDS
magnetohydrodynamic, Hartmann flow, periodic channel flow, Large-Eddy-Simulation, k-equation subgrid-scale model, Open-FOAM, MHDpisoFoam
PAPER SUBMITTED: 2016-12-15
PAPER REVISED: 1970-01-01
PAPER ACCEPTED: 2017-02-20
PUBLISHED ONLINE: 2017-04-08
DOI REFERENCE: https://doi.org/10.2298/TSCI161215092W
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2017, VOLUME 21, ISSUE Supplement 3, PAGES [617 - 628]
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Large-Eddy-Simulation of turbulent magnetohydrodynamic flows

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