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Long global gyrokinetic simulations : source terms and particle noise control
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McMillan, Ben F., Jolliet, S., Tran, T. M., Villard, L., Bottino, A. and Angelino, P. (2008) Long global gyrokinetic simulations : source terms and particle noise control. Physics of Plasmas, Vol.15 (No.5). Article: 052308. doi:10.1063/1.2921792 ISSN 1070-664X.
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Official URL: http://dx.doi.org/10.1063/1.2921792
Abstract
In global gyrokinetic simulations it takes a long time for the turbulence to reach a quasisteady state, and quantitative predictions about the quasisteady state turbulence have been difficult to obtain computationally. In particular, global particle-in-cell gyrokinetic simulations have been inefficient for long simulations due to the accumulation of noise. It is demonstrated that a simple Krook operator can effectively control noise; it also introduces an unphysical dissipation, which damps the zonal flows and can significantly affect simulation results even when the relaxation time is very long. However, it is possible to project out the effects of the Krook operator on the zonal flows. This permits noise accumulation to be controlled while preserving the physics of interest; simulations are then run to determine the level of quasisteady state transport and the variation across the ensemble of turbulent dynamics. Convergence is demonstrated both in the number of computational particles and the unphysical relaxation time.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Physics of Plasmas | ||||
Publisher: | American Institute of Physics | ||||
ISSN: | 1070-664X | ||||
Official Date: | 29 May 2008 | ||||
Dates: |
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Volume: | Vol.15 | ||||
Number: | No.5 | ||||
Page Range: | Article: 052308 | ||||
DOI: | 10.1063/1.2921792 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (SNF), Ecole Polytechnique Fédérale de Lausanne |
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