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Unified transport scaling laws for plasma blobs and depletions

Permanent lenke
https://hdl.handle.net/10037/11400
DOI
http://dx.doi.org/10.1063/1.4985318
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article.pdf (252.9Kb)
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Dato
2017-06-14
Type
Journal article
Tidsskriftartikkel
Peer reviewed

Forfatter
Wiesenberger, Matthias; Held, Markus; Kube, Ralph; Garcia, Odd Erik
Sammendrag
We study the dynamics of seeded plasma blobs and depletions in an (effective) gravitational field. For incompressible flows, the radial center of mass velocity of blobs and depletions is proportional to the square root of their initial cross-field size and amplitude. If the flows are compressible, this scaling holds only for ratios of amplitude to size larger than a critical value. Otherwise, the maximum blob and depletion velocity depends linearly on the initial amplitude and is independent of size. In both cases, the acceleration of blobs and depletions depends on their initial amplitude relative to the background plasma density and is proportional to gravity and independent of their cross-field size. Due to their reduced inertia plasma, depletions accelerate more quickly than the corresponding blobs. These scaling laws are derived from the invariants of the governing drift-fluid equations for blobs and agree excellently with numerical simulations over five orders of magnitude for both blobs and depletions. We suggest an empirical model that unifies and correctly captures the radial acceleration and maximum velocities of both blobs and depletions.
Beskrivelse
Source at http://dx.doi.org/10.1063/1.4985318
Forlag
AIP Publishing
Sitering
Wiesenberger M, Held, M, Kube R, Garcia OE. Unified transport scaling laws for plasma blobs and depletions. Physics of Plasmas. 2017;24
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