Speaker
Dr
Nobumitsu Yokoi
(Institute of Industrial Science, University of Tokyo)
Description
Turbulence modeling provides a powerful tool for investigating realistic
turbulence
with large-scale inhomogeneities. An attempt to study fast
reconnection with the aid
of self-consistent turbulence model is introduced. Turbulence related to
magnetic
reconnection is not homogeneous-isotropic at all. Its statistical
properties depend on
the large-scale configurations of the magnetic and flow fields. Because
of the field
configuration intrinsic to the reconnection and its asymmetry, statistical
properties of
turbulence should be described not only by the intensity information of
turbulence
(energy) but also by the structural information of it (some
pseudoscalars). This
suggests that the turbulence effect is not only for enhancing (as usually
considered)
but also for suppressing the transport. Combination of the transport
enhancement
and suppression gives the possibility of a very localized strong
transport. The fast
reconnection phenomena are interpreted from this viewpoint. Another
interesting
topic is shock--turbulence interaction in magnetic reconnection. The
density
variance, which is dominant near the strong density variation, and its
effect on
turbulence in the vicinity of the shock are investigated. A turbulence
model for such
strong compressible case is proposed. Finally, on the basis of the
realistic turbulence
model, some implications for the measurement of turbulence quantities
using
satellite observation near the reconnection region are presented.
Primary author
Dr
Nobumitsu Yokoi
(Institute of Industrial Science, University of Tokyo)
