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Plasma turbulence described by the Hasegawa-Wakatani equations has beensimulated numerically for different models and values of the adiabaticityparameter C. It is found that for low values of C turbulence remains isotropic,zonal flows are not generated and there is no suppression of the meridionaldrift waves and of the particle transport. For high values of C, turbulenceevolves toward highly anisotropic states with a dominant contribution of thezonal sector to the kinetic energy. This anisotropic flow leads to a decreaseof a turbulence production in the meridional sector and limits the particletransport across the mean isopycnal surfaces. This behavior allows to considerthe Hasegawa-Wakatani equations a minimal PDE model which contains thedrift-wave/zonal-flow feedback loop prototypical of the LH transition in plasmadevices.

Zonal flow generation and its feedback on turbulence production in drift wave turbulence