Unified mesoscale picture of nonlinear generation of zonal flows in toroidal geometry
Recent experimental findings on limit-cycle-oscillations indicate that the nonlinear driving of the turbulent poloidal Reynolds stress to zonal flows (ZFs) is not a significant factor in the toroidal geometry, sparking fundamental controversial issues within the fusion community. By using the global...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | Nuclear Fusion |
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| Online Access: | https://doi.org/10.1088/1741-4326/ad948b |
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| author | Zihao Wang Shaojie Wang |
| author_facet | Zihao Wang Shaojie Wang |
| author_sort | Zihao Wang |
| collection | DOAJ |
| description | Recent experimental findings on limit-cycle-oscillations indicate that the nonlinear driving of the turbulent poloidal Reynolds stress to zonal flows (ZFs) is not a significant factor in the toroidal geometry, sparking fundamental controversial issues within the fusion community. By using the global nonlinear gyrokinetic simulations, we propose a unified mesoscale picture of nonlinear driving of ZFs in the ion-temperature-gradient turbulence. ZFs are nonlinearly driven by the turbulent energy flux and the turbulent poloidal Reynolds stress. The turbulent energy flux is not shielded by the toroidal geometry effect in nonlinearly driving ZFs. The turbulent poloidal Reynolds stress is not shielded on the time scale shorter than the ion bounce period; however, on the time scale longer than the ion bounce period, the turbulent poloidal Reynolds stress is indeed shielded by the toroidal geometry effect. |
| format | Article |
| id | doaj-art-8c60cc4e22ec4cb68a8296dfd5dfc53a |
| institution | DOAJ |
| issn | 0029-5515 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Nuclear Fusion |
| spelling | doaj-art-8c60cc4e22ec4cb68a8296dfd5dfc53a2025-08-20T02:48:57ZengIOP PublishingNuclear Fusion0029-55152024-01-0165101603410.1088/1741-4326/ad948bUnified mesoscale picture of nonlinear generation of zonal flows in toroidal geometryZihao Wang0https://orcid.org/0000-0001-5545-4411Shaojie Wang1Department of Engineering and Applied Physics, University of Science and Technology of China , Hefei 230026, ChinaDepartment of Engineering and Applied Physics, University of Science and Technology of China , Hefei 230026, ChinaRecent experimental findings on limit-cycle-oscillations indicate that the nonlinear driving of the turbulent poloidal Reynolds stress to zonal flows (ZFs) is not a significant factor in the toroidal geometry, sparking fundamental controversial issues within the fusion community. By using the global nonlinear gyrokinetic simulations, we propose a unified mesoscale picture of nonlinear driving of ZFs in the ion-temperature-gradient turbulence. ZFs are nonlinearly driven by the turbulent energy flux and the turbulent poloidal Reynolds stress. The turbulent energy flux is not shielded by the toroidal geometry effect in nonlinearly driving ZFs. The turbulent poloidal Reynolds stress is not shielded on the time scale shorter than the ion bounce period; however, on the time scale longer than the ion bounce period, the turbulent poloidal Reynolds stress is indeed shielded by the toroidal geometry effect.https://doi.org/10.1088/1741-4326/ad948btokamakzonal flowsgyrokinetic theorynumerical simulationreynolds stresslimit-cycle-oscillations |
| spellingShingle | Zihao Wang Shaojie Wang Unified mesoscale picture of nonlinear generation of zonal flows in toroidal geometry Nuclear Fusion tokamak zonal flows gyrokinetic theory numerical simulation reynolds stress limit-cycle-oscillations |
| title | Unified mesoscale picture of nonlinear generation of zonal flows in toroidal geometry |
| title_full | Unified mesoscale picture of nonlinear generation of zonal flows in toroidal geometry |
| title_fullStr | Unified mesoscale picture of nonlinear generation of zonal flows in toroidal geometry |
| title_full_unstemmed | Unified mesoscale picture of nonlinear generation of zonal flows in toroidal geometry |
| title_short | Unified mesoscale picture of nonlinear generation of zonal flows in toroidal geometry |
| title_sort | unified mesoscale picture of nonlinear generation of zonal flows in toroidal geometry |
| topic | tokamak zonal flows gyrokinetic theory numerical simulation reynolds stress limit-cycle-oscillations |
| url | https://doi.org/10.1088/1741-4326/ad948b |
| work_keys_str_mv | AT zihaowang unifiedmesoscalepictureofnonlineargenerationofzonalflowsintoroidalgeometry AT shaojiewang unifiedmesoscalepictureofnonlineargenerationofzonalflowsintoroidalgeometry |