Direct numerical simulation of homogeneous isotropic cross-helical MHD turbulence

Magnetohydrodynamic (MHD) turbulence with cross-helicity excited by a large-scale source is considered. The source is a random external force contributing energy with a controlled level of cross-helicity. The proposed approach allows one to form and maintain high levels of cross-helicity without using an external constant magnetic field. The force is implemented in the software package TARANG. A series of numerical experiments with a constant energy flow and various levels of injection of cross-helicity have been carried out. The ratio of the cross-helicity to the total energy varied in the range from 0 to 0.6. The calculations were carried out at kinetic Reynolds number R = 2094 and at magnetic Prandtl number Prm = 1 on the grid 5123. An equal amount of energy per unit of time was introduced into velocity and magnetic induction fields. Regardless of the level of cross-helicity, the rate of dissipation of magnetic energy has always been higher than the intensity of injection...