Analysis and Characterization of ITG Turbulence Seen in Computer Simulations

Details Analysis and Characterization of ITG Turbulence Seen in Computer Simulations Analysis and Characterization of ITG Turbulence Seen in Computer Simulations

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apre16011n&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Advances in computational power and the development of efficient computational agorithims have enabled direct numerical simulations of sufficient fidelity for realistic studies of plasma microturbulence. Data from gyrokinetic simulations of ion temperature gradient (ITG) turbulence is analyzed. It has a well defined phase velocity within each flux surface. Radial variations in the phase velocity track the ExB flow velocity. ITG turbulence can be characterized by the phase velocity in the local ExB frame, the spectral density (which serves to define both the mean wave number and the spectral index), correlation lengths, and correlation time. Parameter scans allow tests of theoretical paradigms commonly used for understanding the turbulent transport, The mixing-length paradigm for estimating turbulent transport coefficients is tested by comparing correlation lengths times to both linear instability characteristics (maximum growth rate and the corresponding wavenumber) and measured turbulent transport coefficients. The importance of 3-wave coupling among ITG modes, or between pairs of ITG modes and zonal flows is assessed by computing the bicoherence.

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