Large-eddy-simulation of turbulent magnetohydrodynamic flows

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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 < lt; 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.

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Woelck, J., & Brenner, G. (2017). Large-eddy-simulation of turbulent magnetohydrodynamic flows. Thermal Science, 21, S617–S628. https://doi.org/10.2298/TSCI161215092W

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