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Investigations Of The Validity Of Quasilinear Theory And The Dynamics Of Drift Wave Turbulence
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Book Synopsis Investigations of the Validity of Quasilinear Theory and the Dynamics of Drift Wave Turbulence by : Yi-Ming Liang
Download or read book Investigations of the Validity of Quasilinear Theory and the Dynamics of Drift Wave Turbulence written by Yi-Ming Liang and published by . This book was released on 1993 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical and Theoretical Investigations of Resistive Drift Wave Turbulence by : T. Sunn Pedersen
Download or read book Numerical and Theoretical Investigations of Resistive Drift Wave Turbulence written by T. Sunn Pedersen and published by . This book was released on 1995 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2003 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multi-scale Interaction of DriftWave Turbulence with Large Scale Shear Flows by : Christopher J. McDevitt
Download or read book Multi-scale Interaction of DriftWave Turbulence with Large Scale Shear Flows written by Christopher J. McDevitt and published by . This book was released on 2008 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multi-scale methods are utilized within the context of strongly magnetized plasmas to describe the interaction of drift wave turbulence with large scale flow structures. The specific contexts treated correspond to transport barrier formation, magnetic island evolution in the presence of drift wave turbulence, and plasma rotation. Emphasis is placed on identifying critical feedback mechanisms via the study of simple, reduced models, rather than the detailed description of isolated components of the system. In Chapter 2 a two component self-consistent model is derived to investigate a novel mechanism of transport barrier formation. It is found that intense cellular flow, driven by modulational instability of the background turbulence provides a viable candidate mechanism for triggering transport barrier formation in regimes of weak magnetic shear. Similarly, the nonlinear modification of the drift wave phase space topology by the cellular flow is investigated. The presence of a weak non-integrable perturbation in the effective Hamiltonian of the drift wave turbulence, induced by the non-axisymmetric component of the cellular flow, is found to circumvent nonlinear wave trapping as a means of quenching the secondary instability drive of the large scale flow. In Chapter 3, the interaction of a tearing mode with drift wave turbulence is discussed. Wave kinetics and adiabatic theory are utilized to treat the feedback of tearing mode flows on the drift wave turbulence. The stresses exerted by the self-consistently evolved drift wave population density on the tearing mode are calculated by mean field methods. The principal effect of the drift waves is to pump the resonant low-m mode via a negative viscosity, consistent with the classical notion of an inverse cascade in quasi 2-D turbulence. In Chapter 4, the multi-scale methods utilized above are extended to describe the transport of parallel momentum. The primarily fluid description employed above is extended to include momentum exchange between waves and resonant particles. A quasi-linear momentum conservation theorem is proven, demonstrating that the total momentum flux can be decomposed into wave and resonant particle fluxes. Quasi-linear expressions for the radial transport of parallel momentum induced both by waves and resonant particles are derived, providing a comprehensive quasi-linear description of parallel momentum transport induced by electrostatic drift wave turbulence.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1987-05 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Dynamics of Interacting Nonlinearities Governing Long Wavelength Driftwave Turbulence by :
Download or read book The Dynamics of Interacting Nonlinearities Governing Long Wavelength Driftwave Turbulence written by and published by . This book was released on 1993 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 cascade dynamics of Kolmogorov, energy is efficiently passed between modes separated by the entire spectrum range in a correlation time. At short wavelengths, transfer is dominated by the polarization drift nonlinearity. While the standard dual cascade applies in this subrange, it is found that finite spectrum size can produce cascades that are reverse directed and are nonconservative in enstrophy and energy similarity ranges. In regions where both nonlinearities are important, cross-coupling between the nolinearities gives rise to large no frequency shifts as well as changes in the spectral dynamics.
Book Synopsis Rossby Wave, Drift Wave and Zonal Flow Turbulence by : Brenda E. Quinn
Download or read book Rossby Wave, Drift Wave and Zonal Flow Turbulence written by Brenda E. Quinn and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An extensive qualitative and quantitative study of Rossby wave, drift wave and zonal flow turbulence in the Charney-Hasegawa-Mima model is presented. This includes details of two generation mechanisms of the zonal flows, evidence of the nonlocal nature of this turbulence and of the energy exchange between the small and large scales. The modulational instability study shows that for strong primary waves the most unstable modes are perpendicular to the primary wave, which corresponds to the generation of a zonal flow if the primary wave is purely meridional. For weak waves, the maximum growth occurs for off-zonal modulations that are close to being in three-wave resonance with the primary wave. Nonlinear jet pinching is observed for all nonlinearity levels but the subsequent dynamics differ between strong and weak primary waves. The jets of the former further roll up into Kármán-like vortex streets and saturate, while for the latter, the growth of the unstable mode reverses and the system oscillates between a dominant jet and a dominant primary wave. A critical level of nonlinearity is defined which separates the two regimes. Some of these characteristics are captured by truncated models. Numerical proof of the extra invariant in Rossby and drift wave turbulence is presented. While the theoretical derivations of this invariant stem from the wave kinetic equation which assumes weak wave amplitudes, it is shown to be relatively-well conserved for higher nonlinearities also. Together with the energy and enstrophy, these three invariants cascade into anisotropic sectors in the k-space as predicted by the Fjørtoft argument. The cascades are characterised by the zonostrophy pushing the energy to the zonal scales. A small scale instability forcing applied to the model has demonstrated the wellknown drift wave - zonal flow feedback loop. The drift wave turbulence is generated from this primary instability. The zonal flows are then excited by either one of the generation mechanisms, extracting energy from the drift waves as they grow. Eventually the turbulence is completely suppressed and the zonal flows saturate. The turbulence spectrum is shown to diffuse in a manner which has been mathematically predicted. The insights gained from this simple model could provide a basis for equivalent studies in more sophisticated plasma and geophysical fluid dynamics models in an effort to fully understand the zonal flow generation, the turbulent transport suppression and the zonal flow saturation processes in both the plasma and geophysical contexts.
Book Synopsis 1992 International Sherwood Fusion Theory Conference, April 6-8, 1992, Sweeney Convention Center, Santa Fe, New Mexico by :
Download or read book 1992 International Sherwood Fusion Theory Conference, April 6-8, 1992, Sweeney Convention Center, Santa Fe, New Mexico written by and published by . This book was released on 1992 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fusion Energy Update written by and published by . This book was released on 1981 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1979 with total page 1520 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976-06 with total page 1216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1992 with total page 1540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book INIS Atomindex written by and published by . This book was released on 1986 with total page 1438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plasma Physics Index written by and published by . This book was released on 1977 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Documentation of Plasma Physics. Pt. 1, Experimental Plasma Physics [and] Theoretical Plasma Physics by :
Download or read book Documentation of Plasma Physics. Pt. 1, Experimental Plasma Physics [and] Theoretical Plasma Physics written by and published by . This book was released on 1981 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Briefs written by and published by . This book was released on 1994 with total page 916 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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