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The origins of \$k^-2\$ spectrum in the decaying Taylor-Green magnetohydrodynamic turbulent flows

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(06.06.2013)

Zusammenfassung

We investigate the origins of \$k^-2\$ spectrum in a decaying Taylor-Green magnetohydrodynamic flow with zero large scale magnetic flux that was reported in Lee et al. (2010). A possible candidate for this scaling exponent has been the weak turbulence phenomenology. From our numerical simulations, we observe that current sheets in the magnetic Taylor-Green flow are formed in regions of magnetic discontinuities. Based on this observation and by studying the influence of the current sheets on the energy spectrum, using a filtering technique, we argue that the discontinuities are responsible for the \$-2\$ power law scaling of the energy spectra of this flow.

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