Abo Bibliothek: Guest
Second Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2001, KTH, Stockholm, Sweden

DOI: 10.1615/TSFP2

EVOLUTION OF CROSS-CORRELATION IN FREE DECAYING AND FORCED MHD TURBULENCE

pages 269-272
DOI: 10.1615/TSFP2.2080
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ABSTRAKT

The longtime evolution of free decaying and forced magnetohydrodynamic (MHD) turbulence is investigated using a shell model of turbulence. Several series of realizations with different kinds of initial conditions have been performed. In most of realizations the state with highly correlated magnetic and velocity fields arises in several dozens of turnover times. This aligned state is characterized by equipartition of magnetic and kinetic energies. However, realizations with magnetic energy exceeding the kinetic one throughout the whole period of simulation have been also observed. In both cases the energy flux is practically blocked. The evolution of the forced turbulence depends not only on the initial conditions but also on the kind of forcing. Under constant external force a long (100-200 turnover times) metastable state gives way to the aligned state and the energy flux also becomes weak causing an increase of total energy. Under the force ensuring a constant level of the kinetic energy at a given scale the system displays an oscillatory behavior.

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