Rotating flux-tube model for local gyrokinetic simulations with background flow and magnetic shears

Le résumé fourni par la source

We have developed a new computational method called the rotating flux-tube model that treats background shear flows in local gyrokinetic simulations. The method is based on extended magnetohydrodynamic ballooning mode theory. A coordinate transformation moves the flux-tube simulation domain along the sheared magnetic field lines, counteracting the deformation caused by the background shear flow. Linear analyses showed that the rotating flux-tube model describes the time-continuous evolution of fluctuations under shear flow as a single wavenumber mode. The formulation of the rotating flux-tube model makes explicit its mathematical correspondence to the Floquet theory. Nonlinear simulations demonstrated that the rotating flux-tube model can analyze the effects of background shear flow on turbulent transport .

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