Non-local transport in turbulent MHD convectionThe nonlocal non-diffusive transport of passive scalars in turbulent magnetohydrodynamic (MHD) convection is investigated using transilient matrices. These matrices describe the probability that a tracer particle beginning at one position in a flow will be advected to another position after some time. A method for the calculation of these matrices from simulation data which involves following the trajectories of passive tracer particles and calculating their transport statistics, is presented. The method is applied to study the transport in several simulations of turbulent, rotating, three dimensional compressible, penetrative MDH convection. Transport coefficients and other diagnostics are used to quantify the transport, which is found to resemble advection more closely than diffusion. Some of the results are found to have direct relevance to other physical problems, such as the light element depletion in sun-type stars. The large kurtosis found for downward moving particles at the base of the convection zone implies several extreme events.
Document ID
19960014163
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Miesch, Mark (Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Brandenburg, Axel (Nordisk Inst. for Teoretisk Atomfysik Copenhagen, Denmark)
Zweibel, Ellen (Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Toomre, Juri (Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Date Acquired
August 17, 2013
Publication Date
June 1, 1995
Publication Information
Publication: ESA, Proceedings of 4th SOHO on Helioseismology. Volume 2: Posters