Massively Parallel Three-Dimensional Toroidal Gyrokinetic Flux-Tube Turbulence Simulation

Authors: Kim C.C.; Parker S.E.

Source: Journal of Computational Physics, Volume 161, Number 2, July 2000 , pp. 589-604(16)

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Abstract:

A massively parallel three-dimensional nonlinear gyrokinetic flux-tube simulation model is discussed. This simulation is used to study turbulent heat transport in core tokamak fusion plasmas. This model allows for high resolution simulations of ion-temperature-gradient-driven turbulence using realistic plasma parameters assuming locality of the turbulent fluctuations. The simulation model, computational techniques, and parallel algorithms are discussed. The use of field-aligned coordinates allows for a natural domain decomposition in the direction along the magnetic field with good parallel performance. Digital filtering along the field line maintains proper toroidal and poloidal periodicity. A new approach to parallelization, “domain cloning,” is presented. Domain cloning is another layer of parallelization. It is an alternative to a two-dimensional domain decomposition and may be useful for clustered symmetric-multiprocessor machines. Performance results are presented for two high-performance massively parallel computers. Copyright 2000 Academic Press.

Language: English

Document Type: Research article

Affiliations: Center for Integrated Plasma Studies, Department of Physics, University of Colorado, Boulder, Colorado, 80309

Publication date: 2000-07-01