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DOE OSTI · 3375580

Paradigm for global gyrokinetic turbulence

Candy, J. [General Atomics, San Diego, CA (United States)]·Dudkovskaia, A. [Univ. of York (United Kingdom)] (ORCID:0000000168903079)·Belli, E. A. [General Atomics, San Diego, CA (United States)] (ORCID:0000000179472841)
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Abstract

Using a novel wave-number-advection algorithm, we describe a method to add global profile curvature terms to the local gyrokinetic equations. This approach enables a high-precision global simulation capability without sacrificing the efficiency and spectral accuracy of local simulations. Preliminary numerical results suggest that there are two distinct types of global correction to the local result: (1) a trivial shift of the local result in radius, (2) a non-trivial decorrelation that is roughly equivalent to the well-known E×B shear effect. This interpretation provides a new, intuitive framework for understanding global gyrokinetic simulations.

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70 PLASMA PHYSICS AND FUSION TECHNOLOGYGyrofluid & gyrokineticsTokamaks

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Candy, J. [General Atomics, San Diego, CA (United States)], Dudkovskaia, A. [Univ. of York (United Kingdom)] (ORCID:0000000168903079), Belli, E. A. [General Atomics, San Diego, CA (United States)] (ORCID:0000000179472841). 2025-05-22. Paradigm for global gyrokinetic turbulence. https://doi.org/10.1103/physreve.111.l053201

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