Verification and modeling of dynamo effect in magnetohydrodynamic turbulence

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It is known that dynamo mechanism exits which generates and sustains large-scale magnetic field against the turbulent diffusion. In this research a large eddy simulation of magnetohydrodynamic turbulent channel flow was carried out to investigate the dynamo effect. Statistics such as the mean magnetic field and the turbulent energy were evaluated and it was shown that the mean magnetic field is generated. Moreover, the production terms in the transport equation for the turbulent electromotive force were examined to show that the mean field generation is due to the dynamo effect of the cross-helicity (the correlation between the velocity and the magnetic field).