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The polarization and magnetization effects associated with the dynamicalreduction leading to the nonlinear gyrokinetic Vlasov-Maxwell equations areshown to introduce nonlinear finite-Larmor-radius effects into a set ofnonlinear reduced-fluid equations previously derived by Lagrangian variationalmethod [A.J. Brizard, Phys. Plasmas 12, 092302 (2005)]. These intrinsicallynonlinear FLR effects, which are associated with the transformation fromguiding-center phase-space dynamics to gyrocenter phase-space dynamics, aredifferent from the standard FLR corrections associated with the transformationfrom particle to guiding-center phase-space dynamics. We also present thelinear dispersion relation and results from a nonlinear simulation code usingthese reduced-fluid equations. The simulation results (in both straight anddipole geometries) demonstrate that the equations describe the coupled dynamicsof Alfven and sound waves and that the total simulation energy is conserved.

Nonlinear finite-Larmor-radius effects in reduced fluid models