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Nonlinear instability mechanism in 3-D collisional driftwave turbulence

Technical Report:

Abstract

Numerical simulations of 3-D collisional drift-wave turbulence reveal a behavior basically different from that found in previous 2-D studies. The linear instability saturates due to energy transfer to small k{sub z} leading to formation of convective cells. The turbulence is sustained by nonlinear transfer processes between k{sub z}=0 and k{sub z}{ne}0 modes, the latter acting as a catalyst. The system tends to relax to a nonturbulent poloidal shear flow. Introducing a damping of this flow gives rise to an intermittent behavior, where laminar periods of zero flux alternate with bursts of turbulence and large flux, the transitions occuring on time scale short compared with the linear growth times. (orig.)
Publication Date:
Aug 01, 1994
Product Type:
Technical Report
Report Number:
IPP-6/322
Reference Number:
SCA: 700340; 700330; PA: DEN-95:0F0639; EDB-95:026339; SN: 95001321446
Resource Relation:
Other Information: PBD: Aug 1994
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DRIFT INSTABILITY; NONLINEAR PROBLEMS; CATALYSTS; CONVECTION; DAMPING; ENERGY TRANSFER; HEAT TRANSFER; LAMINAR FLOW; THREE-DIMENSIONAL CALCULATIONS; TURBULENCE; PLASMA; PLASMA DRIFT; COMPUTERIZED SIMULATION; NUMERICAL SOLUTION; FLUCTUATIONS; 700340; 700330; PLASMA WAVES, OSCILLATIONS, AND INSTABILITIES; PLASMA KINETICS, TRANSPORT, AND IMPURITIES
OSTI ID:
10110226
Research Organizations:
Max-Planck-Institut fuer Plasmaphysik, Garching (Germany)
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ON: DE95738334; TRN: DE95F0639
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
26 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Biskamp, D, and Zeiler, A. Nonlinear instability mechanism in 3-D collisional driftwave turbulence. Germany: N. p., 1994. Web.
Biskamp, D, & Zeiler, A. Nonlinear instability mechanism in 3-D collisional driftwave turbulence. Germany.
Biskamp, D, and Zeiler, A. 1994. "Nonlinear instability mechanism in 3-D collisional driftwave turbulence." Germany.
@misc{etde_10110226,
title = {Nonlinear instability mechanism in 3-D collisional driftwave turbulence}
author = {Biskamp, D, and Zeiler, A}
abstractNote = {Numerical simulations of 3-D collisional drift-wave turbulence reveal a behavior basically different from that found in previous 2-D studies. The linear instability saturates due to energy transfer to small k{sub z} leading to formation of convective cells. The turbulence is sustained by nonlinear transfer processes between k{sub z}=0 and k{sub z}{ne}0 modes, the latter acting as a catalyst. The system tends to relax to a nonturbulent poloidal shear flow. Introducing a damping of this flow gives rise to an intermittent behavior, where laminar periods of zero flux alternate with bursts of turbulence and large flux, the transitions occuring on time scale short compared with the linear growth times. (orig.)}
place = {Germany}
year = {1994}
month = {Aug}
}