Experimental con_firmation of self-regulating turbulence paradigm in the two-dimensional spectral condensation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F14%3A00436877" target="_blank" >RIV/61389021:_____/14:00436877 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Experimental con_firmation of self-regulating turbulence paradigm in the two-dimensional spectral condensation

Original language description

Turbulent transport in magnetic fusion plasmas can be significantly suppressed by Reynolds-stress-inducedzonal flows, allowing effective plasma confinement. We present experimental evidence of spatiotemporalcorrelation between small-scale turbulence-induced Reynolds stress and large-scale zonal flow production inthe E B driven hydrodynamic spectral condensation. We show that Reynolds stress is generated effectively byanisotropic vorticity structures possessing collective tilt angle. The maximum amplitude of the tilt, the Reynoldsstress, and the mean zonal flow production coincide with the transition time of the velocity field, indicatinga key role of turbulence-induced Reynolds stress in the condensation of the flow. The analysis of the energytransferbetween turbulence and zonal flow shows coherent oscillations with ?/2 phase delay, thus indicating apredator-prey-like interaction between zonal flow and turbulence.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BL - Plasma physics and discharge through gases

OECD FORD branch

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Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2014

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Review. E

ISSN

1539-3755

e-ISSN

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Volume of the periodical

90

Issue of the periodical within the volume

December

Country of publishing house

US - UNITED STATES

Number of pages

5

Pages from-to

063103-063103

UT code for WoS article

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EID of the result in the Scopus database

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