Abstract Details
Abstracts
Author: Mikhail Dorf
Requested Type: Poster
Submitted: 2019-02-21 11:11:05
Co-authors: M. Dorr
Contact Info:
LLNL
7000 East Ave
Livermore, CA 94550
United States
Abstract Text:
COGENT is a continuum gyrokinetic code being developed by the Edge Simulation Laboratory for edge plasmas. The code is distinguished by the use of a high-order finite-volume (conservative) discretization combined with arbitrary mapped multiblock grid technology. Our recent work is focused on development of a 5D version of the COGENT code to model edge plasma turbulence. A numerical algorithm utilizing locally field-aligned multiblock coordinate system has been developed to facilitate simulations of highly-anisotropic microturbulence in the presence of a strong magnetic shear (e.g., as occurs at the X-point). The algorithm has been implemented for slab and toroidal annulus sheared geometries, and its extension to a single-null geometry is currently underway. The present paper reports on details of the numerical implementation and presents initial results of verification studies that include simulations of universal (collisionless) drift instability in a sheared slab geometry and ITG instability in a sheared toroidal geometry. In addition, progress toward a single-null 5D version of the code is discussed.
*Work performed for USDOE, at LLNL under contract DE-AC52-07NA27344.
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