We determine numerically in two space dimensions the anomalous exponents of structure functions of the velocity v, the magnetic field b and the Els ̈sser variables z± = v ± b a up to order eight. To that effect, we make use of new exact relationships derived recently for mixed z± third-order correlators. These exponents are compared to existing models of intermittency for either neutral or MHD flows, none of which seem to apply, possibly indicative of a more complex behavior for MHD flows than for neutral fluids.
Determination of anomalous exponents of structure functions in two-dimensional magnetohydrodynamic turbulence
CARBONE, Vincenzo
1998-01-01
Abstract
We determine numerically in two space dimensions the anomalous exponents of structure functions of the velocity v, the magnetic field b and the Els ̈sser variables z± = v ± b a up to order eight. To that effect, we make use of new exact relationships derived recently for mixed z± third-order correlators. These exponents are compared to existing models of intermittency for either neutral or MHD flows, none of which seem to apply, possibly indicative of a more complex behavior for MHD flows than for neutral fluids.File in questo prodotto:
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