TY - JOUR
T1 - Turbulence simulation on zonal flow formations in the presence of parallel flows
AU - Sasaki, Makoto
AU - Kasuya, Naohiro
AU - Kosuga, Yusuke
AU - Kobayashi, Tatsuya
AU - Yamada, Takuma
AU - Arakawa, Hiroyuki
AU - Shigeru, Inagaki
AU - Itoh, Kimitaka
N1 - Funding Information:
The authors acknowledge stimulating discussion with and strong support by Prof. S.-I. Itoh. The paper is dedicated to her memory. This work was partly supported by a grant-in-aid for scientific research of JSPS KAKENHI Grant Number (JP16K18335, JP17H06089, JP16H02442, JP15H02155, JP15H02335, JP18K03578), the collaboration programs of NIFS (NIFS17KNST122, NIFS18KNST137, NIFS19KNST151), Asada Science Foundation, Progress 100 of Kyushu University (NB80645028), and the RIAM of Kyushu University.
Publisher Copyright:
© 2019 The Japan Society of Plasma Science and Nuclear Fusion Research.
PY - 2019
Y1 - 2019
N2 - It is demonstrated that the zonal flow is controlled by the parallel flow in the cylindrical plasmas. A threedimensional turbulence simulation is performed, based on the reduced fluid model. The background parallel flow is applied by introducing the time independent parallel momentum source. Changing the magnitude of the momentum source, the behavior of the zonal flow is investigated. The drift wave turbulence is affected by the parallel flow, and it shows the spatial competition between turbulence modes. The spatial competition appears/disappears abruptly, depending on the intensity of the parallel momentum source. As a consequence of the transition between the turbulence state, the radial profile of the turbulence drastically changes, which leads to the change of the turbulence force to drive the zonal flow. In this way, the parallel flow indirectly affects the zonal flow through the deformation of the turbulence.
AB - It is demonstrated that the zonal flow is controlled by the parallel flow in the cylindrical plasmas. A threedimensional turbulence simulation is performed, based on the reduced fluid model. The background parallel flow is applied by introducing the time independent parallel momentum source. Changing the magnitude of the momentum source, the behavior of the zonal flow is investigated. The drift wave turbulence is affected by the parallel flow, and it shows the spatial competition between turbulence modes. The spatial competition appears/disappears abruptly, depending on the intensity of the parallel momentum source. As a consequence of the transition between the turbulence state, the radial profile of the turbulence drastically changes, which leads to the change of the turbulence force to drive the zonal flow. In this way, the parallel flow indirectly affects the zonal flow through the deformation of the turbulence.
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U2 - 10.1585/PFR.14.1401161
DO - 10.1585/PFR.14.1401161
M3 - Article
AN - SCOPUS:85083356318
SN - 1880-6821
VL - 14
JO - Plasma and Fusion Research
JF - Plasma and Fusion Research
M1 - 1161
ER -