The dynamics of interacting nonlinearities governing long wavelength driftwave turbulence
Because of the ubiquitous nature of turbulence and the vast array of different systems which have turbulent solutions, the study of turbulence is an area of active research. Much present day understanding of turbulence is rooted in the well established properties of homogeneous Navier-Stokes turbulence, which, due to its relative simplicity, allows for approximate analytic solutions. This work examines a group of turbulent systems with marked differences from Navier-Stokes turbulence, and attempts to quantify some of their properties. This group of systems represents a variety of drift wave fluctuations believed to be of fundamental importance in laboratory fusion devices. From extensive simulation of simple local fluid models of long wavelength drift wave turbulence in tokamaks, a reasonably complete picture of the basic properties of spectral transfer and saturation has emerged. These studies indicate that many conventional notions concerning directions of cascades, locality and isotropy of transfer, frequencies of fluctuations, and stationarity of saturation are not valid for moderate to long wavelengths. In particular, spectral energy transfer at long wavelengths is dominated by the E x B nonlinearity, which carries energy to short scale in a manner that is highly nonlocal and anisotropic. In marked contrast to the canonical self-similar cascademore »
- Publication Date:
- OSTI Identifier:
- 10103225
- Report Number(s):
- DOE/ER/53291--225
ON: DE94001785; BR: AT0520210; TRN: 94:001335
- DOE Contract Number:
- FG02-89ER53291
- Resource Type:
- Thesis/Dissertation
- Resource Relation:
- Other Information: TH: Thesis (Ph.D.); PBD: Sep 1993
- Research Org:
- Wisconsin Univ., Madison, WI (United States). Plasma Physics Research
- Sponsoring Org:
- USDOE
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TURBULENCE; NONLINEAR PROBLEMS; PLASMA DRIFT; NAVIER-STOKES EQUATIONS; MAGNETIC CONFINEMENT; PLASMA WAVES 700340; 700330; PLASMA WAVES, OSCILLATIONS, AND INSTABILITIES; PLASMA KINETICS, TRANSPORT, AND IMPURITIES
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