Structure formation and transport in dissipative drift-wave turbulence

Journal Article · Tue Sep 01 04:00:00 EDT 1992 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860151· OSTI ID:7008855

Koniges, A E; Crotinger, J A ^[1]; Diamond, P H ^[2]

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1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
2. University of California, San Diego, La Jolla, California 92093 (United States)

Numerical flow simulations are used to study the effect of coherent structures on transport in the context of a two-field, two-dimensional model of dissipative drift-wave turbulence. The presence and nature of structures are found to depend on the adiabaticity parameter {alpha}={ital k}{sub {parallel}}{sup 2} {ital V}{sub {ital T}}{sup 2}/2{nu}{sub {ital ei}}{omega}{sub {ital s}} which controls the degree to which the electrons respond to parallel electric fields. Transport estimates based on quasilinear and mixing-length models are compared with the simulations. In the regime with long-lived coherent structures, the turbulent particle transport predicted by a standard quasilinear or mean-field estimate is found to exceed that actually observed in the presence of coherent structures.

• DOE Contract Number: FG03-88ER53275
• OSTI ID: 7008855
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 4:9; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

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FLUCTUATIONS
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