Speaker
Dr
Nobumitsu Yokoi
(Institute of Industrial Science, University of Tokyo)
Description
Effect of cross helicity (velocity--magnetic-field correlation) in the
mean momentum equation is investigated. Turbulent cross helicity
enters the expression for the mean-field Lorentz force. Combined
with the contributions through the Reynolds and turbulent Maxwell
stresses, it gives a possibility to induce a flow. Mean momentum
equation is examined from this viewpoint. As for some examples,
poloidal flow in the reversed-shear (RS) mode in tokamak plasmas,
torsional oscillations in the solar convection zone, and explosive
magnetic reconnection are argued in this framework.
