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Massively parallel three-dimensional toroidal gyrokinetic flux-tube turbulence simulation. (English) Zbl 0980.76058

Summary: We propose a massively parallel three-dimensional nonlinear gyrokinetic flux-tube simulation model. 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 and 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.

MSC:

76M20 Finite difference methods applied to problems in fluid mechanics
76X05 Ionized gas flow in electromagnetic fields; plasmic flow
76F25 Turbulent transport, mixing
65Y05 Parallel numerical computation
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