Different responses of the Rayleigh–Taylor type and resistive drift wave instabilities to the velocity shear

Zhang, Y.; Krasheninnikov, S. I.; Smolyakov, A. I.

doi:10.1063/1.5130409

Different responses of the Rayleigh–Taylor type and resistive drift wave instabilities to the velocity shear

Journal Article · Mon Feb 03 00:00:00 EST 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5130409· OSTI ID:1800218

^[1]; Krasheninnikov, S. I. ^[2]; ^[3]

Univ. of California, San Diego, CA (United States); University of California, San Diego
Univ. of California, San Diego, CA (United States)
Univ. of Saskatchewan, Saskatoon, SK (Canada)

The effects of velocity shear on the unstable modes driven by the effective gravity (Rayleigh–Taylor and interchange) and resistive drift wave instabilities for inhomogeneous equilibrium fluid/plasma density are analyzed for the localized eigenmode problems. It is shown that the effect of the velocity shear drastically depends on the type of instability. Whereas the velocity shear can significantly suppress both Rayleigh–Taylor and interchange instabilities, it has only a weak impact on the growth rate of the resistive drift wave. This is directly related to the physical nature of these instabilities. For the Rayleigh–Taylor and interchange instabilities, the shear flow tilts the eddies of the stream functions, while for the resistive drift wave instability the shear flow simply shifts the eddies in the radial direction with no tilting. However, for a large velocity shear, the eigenmode solutions for resistive drift waves cease to exist.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-04ER54739

OSTI ID:: 1800218

Alternate ID(s):: OSTI ID: 1596899

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 27; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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