Large-Eddy-Simulation of turbulent magnetohydrodynamic flows

• Main Authors: Woelck Johannes, Brenner Gunther
• Format: Article
• Language: English
• Published: VINCA Institute of Nuclear Sciences 2017-01-01
• Series: Thermal Science
• Subjects: magnetohydrodynamic; Hartmann flow; periodic channel flow; Large-Eddy-Simulation; k-equation subgrid-scale model; Open-FOAM; MHDpisoFoam
• Online Access: http://www.doiserbia.nb.rs/img/doi/0354-9836/2017/0354-98361700092W.pdf

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.