Subgrid-Scale Modeling of Magnetohydrodynamic Turbulence

A subgrid-scale (SGS) model is proposed to enable the numerical simulation of magnetohydrodynamic (MHD) turbulence at very high kinetic and magnetic Reynolds numbers in fusion plasma physics and astro/geophysics. The model supplements the SGS energy dissipation process with the aid of the SGS turbulent viscosity, the SGS anomalous resistivity, etc., which are written in terms of the grid-scale magnetic field and velocity.