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Spectral Properties of mhd turbulence in 2.5-Dimensional Compressible Plasmas

Plasma Science and Technology 2009年第2期11卷 146-151页

作者：段书超马志为 Institute of Plasma Physics Chinese Academy of Sciences

Spectral properties of magnetohydrodynamic （mhd） turbulence with a strong back- ground mean magnetic field in 2.5-dimensional compressible plasmas are studied by high-resolution numerical simulations. The spatial properties of mhd turbulences and the energy transfer process in the k-space are analyzed through angle-averaged energy spectrum. It is found that in the inertial phase, the energy spectrum index of compressible mhd turbulences during the decaying phase is evolved with time. The index varies in a quite wide regime from Kolmogorov＇s 5/3 to IK＇s 3/2 during the late simulation period. The energy spectrum index in the later nonlinear stage is also dependent on the chosen initial conditions. The spectral index increases with the increase of the initial magnetic fluctuation while the index decreases with the increase of the initial flow perturbation.

关键词： turbulence mhd turbulence 2.5D compressible mhd energy spectrum numerical simulation

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Low Rm mhd turbulence:The Role of Boundaries

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Journal of Iron and Steel Research International 2012年第S1期19卷 514-518页

作者： Alban Pothérat Applied Mathematics Research Centre Coventry University Priory StreetCoventry CV 15FBUK

In this Keynote lecture,we review the main known features of mhd turbulence at low magnetic Reynolds number,that is when the flow isn't intense enough to disturb an externally applied magnetic *** emphasis is deliberately placed on the very specific physical mechanisms of this type of flows,rather than their numerical modelling. We also focus on homogeneous magnetic fields which have received most *** stress in particular that the tendency to two-dimensionality observed in these flows casts the boundaries of the domain into a leading role.

关键词： magnetic field mhd turbulence Lorentz force two-dimensionality three-dimensionality

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Numerical Modeling of Turbulent Melt Flow in a Continuous Casting Mold Affected by an Electromagnetic Brake

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Journal of Iron and Steel Research International 2012年第S2期19卷 845-848页

作者： MIAO Xin-cheng Timmel Klaus Lucas Dirk REN Zhong-ming Eckert Sven Gerbeth Gunter mhd Department Helmholtz-Zentrum Dresden-Rossendorf(HZDR) Key Laboratory of Metallurgy & Materials Processing Shanghai University

The current work combines numerical and experimental investigations based on a small-scale mockup using the eutectic alloy *** jet flow discharging from the submerged entry nozzle was exposed perpendicularly to a DC magnetic field across the entire wide face of the *** calculations were performed by using the commercial package CFX with an implemented RANS-SST turbulence *** anisotropic properties of the mhd turbulence were taken into account by specific modifications of the turbulence *** comparison between our numerical calculations and the experimental results shows a very well *** particular,the modified RANS-SST turbulence model is capable to reconstruct the peculiar phenomenon of the excitation of non-steady,non-isotropic large-scale flow perturbations caused by the application of the DC magnetic *** important finding of our study is the feature that the electrical boundary conditions,namely the wall conductivity ratio,have a great impact on the mold flow subjected to an external magnetic field.

关键词： continuous casting electromagnetic brake RANS-SST turbulence model mhd turbulence

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LSFEM Implementation of mhd Numerical Solver

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Applied Mathematics 2012年第11期3卷 1842-1850页

作者： Jan Skala Miroslav Barta University J.E.Purkinje Ustínad LabemCzech Republic Max Planck Institute for Solar System Research Katlenburg-LindauGermany Astronomical Institute of Czech Academy of Sciences OndrejovCzech Republic

Many problems in physics are inherently of multi-scale nature. The issues of mhd turbulence or magnetic reconnection, namely in the hot and sparse, almost collision-less astrophysical plasmas, can stand as clear examples. The Finite Element Method (FEM) with adaptive gridding appears to be the appropriate numerical implementation for handling the broad range of scales contained in such high Lundquist-number mhd problems. In spite the FEM is now routinely used in engineering practice in solid-state and fluid dynamics, its usage for mhd simulations has recently only begun and only few implementations exist so far. In this paper we present our mhd solver based on the Least-Square FEM (LSFEM) formulation. We describe the transformation of the mhd equations into form required for finding the LSFEM functional and some practical issues in implementation of the method. The algorithm was tested on selected problems of ideal (non-resistive) and resistive mhd. The tests show the usability of LSFEM for solving mhd equations.

关键词： Magnetohydrodynamics (mhd) Least-Squares Finite Element Method Adaptive Mesh Refinement Magnetic Reconnection Solar Eruptions mhd turbulence

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Numerical Modeling of Turbulent Melt Flow in a Continuous Casting Mold Affected by an Electromagnetic Brake

Numerical Modeling of Turbulent Melt Flow in a Continuous Ca...

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第七届冶金与材料电磁过程国际会议（EPM2012）

关键词： continuous casting electromagnetic brake RANS-SST turbulence model mhd turbulence

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