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Report No.
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Parallel filtering in global gyrokinetic simulations

Jolliet, S.; McMillan, B. F.*; Villard, L.*; Vernay, T.*; Angelino, P.*; Tran, T. M.*; Brunner, S.*; Bottino, A.*; Idomura, Yasuhiro   

In this work, a Fourier solver is implemented in the global Eulerian gyrokinetic code GT5D and in the global Particle-In-Cell code ORB5 in order to reduce the memory of the matrix associated with the field equation. This scheme is verified with linear and nonlinear simulations of turbulence. It is demonstrated that the straight-field-line angle is the coordinate that optimizes the Fourier solver, that both linear and nonlinear turbulent states are unaffected by the parallel filtering, and that the $$k_parallel$$ spectrum is independent of plasma size at fixed normalized poloidal wave number.

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Category:Computer Science, Interdisciplinary Applications

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