Three-dimensional global fluid simulations of cylindrical magnetized plasmas

Naulin, V.; Windisch, T.; Grulke, O.

doi:10.1063/1.2829603

Cited by 33 publications

(49 citation statements)

References 30 publications

(29 reference statements)

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“…For different source strength and radial extension, very different patterns are possible, an outcome already observed in Ref. 7. In Fig.…”

Section: A Linear and Non-linear Phasesupporting

confidence: 52%

Revisited global drift fluid model for linear devices

Reiser

2012

Physics of Plasmas

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The problem of energy conserving global drift fluid simulations is revisited. It is found that for the case of cylindrical plasmas in a homogenous magnetic field, a straightforward reformulation is possible avoiding simplifications leading to energetic inconsistencies. The particular new feature is the rigorous treatment of the polarisation drift by a generalization of the vorticity equation. The resulting set of model equations contains previous formulations as limiting cases and is suitable for efficient numerical techniques. Examples of applications on studies of plasma blobs and its impact on plasma target interaction are presented. The numerical studies focus on the appearance of plasma blobs and intermittent transport and its consequences on the release of sputtered target materials in the plasma. Intermittent expulsion of particles in radial direction can be observed and it is found that although the neutrals released from the target show strong fluctuations in their propagation into the plasma column, the overall effect on time averaged profiles is negligible for the conditions considered. In addition, the numerical simulations are utilised to perform an a-posteriori assessment of the magnitude of energetic inconsistencies in previously used simplified models. It is found that certain popular approximations, in particular by the use of simplified vorticity equations, do not significantly affect energetics. However, popular model simplifications with respect to parallel advection are found to provide significant deterioration of the model consistency. [http://dx

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“…For different source strength and radial extension, very different patterns are possible, an outcome already observed in Ref. 7. In Fig.…”

Section: A Linear and Non-linear Phasesupporting

confidence: 52%

Revisited global drift fluid model for linear devices

Reiser

2012

Physics of Plasmas

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“…0, and the boundary conditions for V ki and V ke reduce to the Bohm boundary conditions at the Debye sheath entrance. Finally, we notice that this set of boundary conditions is not limited to 3D fluid models [4][5][6] but may also be applied to 2D fluid models, 2,3 where expressions for V ki and V ke are needed at the MP entrance.…”

Section: Discussionmentioning

confidence: 99%

Boundary conditions for plasma fluid models at the magnetic presheath entrance

et al. 2012

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The proper boundary conditions at the magnetic presheath entrance for plasma fluid turbulence models based on the drift approximation are derived, focusing on a weakly collisional plasma sheath with Ti≪Te and a magnetic field oblique to a totally absorbing wall. First, the location of the magnetic presheath entrance is rigorously derived. Then boundary conditions at the magnetic presheath entrance are analytically deduced for v||i, v||e, n, ϕ, Te, and for the vorticity ω=∇⊥2ϕ. The effects of E × B and diamagnetic drifts on the boundary conditions are also investigated. Kinetic simulations are performed that confirm the analytical results. Finally, the new set of boundary conditions is implemented in a three-dimensional global fluid code for the simulation of plasma turbulence and, as an example, the results of a tokamak scrape-off layer simulation are discussed. The framework presented can be generalized to obtain boundary conditions at the magnetic presheath entrance in more complex scenarios.

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“…The numerical simulation results presented here are done with the CYTO code [14]. The code solves the two-fluid equations in a three-dimensional cylindrical geometry with sheath boundary conditions and an axially localized Gaussian density source profile.…”

Section: Numerical Simulation Resultsmentioning

confidence: 99%

“…In Sec. 3 the experimental observations are compared to numerical simulation results using the three-dimensional CYTO code [14] and influence of sheared flows on the fluctuation dynamics is investigated in detail. Finally, the results are summarized in Sec.…”

Section: Introductionmentioning

confidence: 99%

Formation of turbulent structures and the link to fluctuation driven sheared flows

Windisch

Grulke

Naulin

et al. 2011

Plasma Phys. Control. Fusion

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Abstract.The formation of turbulent structures in weakly-developed drift wave turbulence is investigated using experimental data obtained in a linear laboratory device. The findings are compared with fully nonlinear numerical simulation results. The formation of structures occurs in a region, in which the divergence of the Reynolds stress, which is one term in the momentum balance, has a maximum. The generation of a time-averaged shear layer is not observed, but for transient events the shearing rate can get sufficiently strong to decorrelate the fluctuations. This happens when the energy flow into the shear flow is largely positive.

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Three-dimensional global fluid simulations of cylindrical magnetized plasmas

Cited by 33 publications

References 30 publications

Revisited global drift fluid model for linear devices

Revisited global drift fluid model for linear devices

Boundary conditions for plasma fluid models at the magnetic presheath entrance

Formation of turbulent structures and the link to fluctuation driven sheared flows

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