Fluid moments in a reduced model with large flow

Miyato, Naoaki; Scott, B. D.*

Reduced models such as the gyrokinetic model are constructed by the phase space transformation from the particle phase space to the guiding-centre phase space which separates the fast gyro-motion of a particle from the other dynamics. We clarify the relation between usual particle fluid moments and fluid moments in a reduced model with large flow which we have constructed recently and compare it with the standard gyrokinetic case. In particular, we discuss the push-forward representation of particle density or the reduced quasi-neutrality condition.