On how structures convey non-diffusive turbulence spreading
We report on comprehensive experimental studies of turbulence spreading in edge plasmas. These studies demonstrate the relation of turbulence spreading and entrainment to intermittent convective density fluctuation events or bursts (i.e. blobs and holes). The non-diffusive character of turbulence sp...
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| Veröffentlicht in: | Nuclear fusion 2024-05, Vol.64 (6) |
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| creator | Long, Ting Diamond, P. H. Ke, Rui Chen, Zhipeng Cao, Mingyun Xu, Xin Xu, Min Hong, Rongjie Tian, Wenjing Yuan, Jinbang Liu, Yanmin Yan, Qinghao Yang, Qinghu Shen, Chengshuo Guo, Weixin Wang, Lu Nie, Lin Wang, Zhanhui Hao, Guangzhou Wang, Nengchao Chen, Zhongyong Pan, Yuan Li, Jiquan Chen, Wei Zhong, Wulyu |
| description | We report on comprehensive experimental studies of turbulence spreading in edge plasmas. These studies demonstrate the relation of turbulence spreading and entrainment to intermittent convective density fluctuation events or bursts (i.e. blobs and holes). The non-diffusive character of turbulence spreading is thus elucidated. The turbulence spreading velocity (or mean jet velocity) manifests a linear correlation with the skewness of density fluctuations, and increases with the auto-correlation time of density fluctuations. Turbulence spreading by positive density fluctuations is outward, while spreading by negative density fluctuations is inward. The degree of symmetry breaking between outward propagating blobs and inward propagating holes increases with the amplitude of density fluctuations. Thus, blob-hole asymmetry emerges as crucial to turbulence spreading. These results highlight the important role of intermittent convective events in conveying the spreading of turbulence, and constitute a fundamental challenge to existing diffusive models of spreading. |
| format | Article |
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H. ; Ke, Rui ; Chen, Zhipeng ; Cao, Mingyun ; Xu, Xin ; Xu, Min ; Hong, Rongjie ; Tian, Wenjing ; Yuan, Jinbang ; Liu, Yanmin ; Yan, Qinghao ; Yang, Qinghu ; Shen, Chengshuo ; Guo, Weixin ; Wang, Lu ; Nie, Lin ; Wang, Zhanhui ; Hao, Guangzhou ; Wang, Nengchao ; Chen, Zhongyong ; Pan, Yuan ; Li, Jiquan ; Chen, Wei ; Zhong, Wulyu</creator><creatorcontrib>Long, Ting ; Diamond, P. H. ; Ke, Rui ; Chen, Zhipeng ; Cao, Mingyun ; Xu, Xin ; Xu, Min ; Hong, Rongjie ; Tian, Wenjing ; Yuan, Jinbang ; Liu, Yanmin ; Yan, Qinghao ; Yang, Qinghu ; Shen, Chengshuo ; Guo, Weixin ; Wang, Lu ; Nie, Lin ; Wang, Zhanhui ; Hao, Guangzhou ; Wang, Nengchao ; Chen, Zhongyong ; Pan, Yuan ; Li, Jiquan ; Chen, Wei ; Zhong, Wulyu ; Univ. of California, San Diego, CA (United States)</creatorcontrib><description>We report on comprehensive experimental studies of turbulence spreading in edge plasmas. These studies demonstrate the relation of turbulence spreading and entrainment to intermittent convective density fluctuation events or bursts (i.e. blobs and holes). The non-diffusive character of turbulence spreading is thus elucidated. The turbulence spreading velocity (or mean jet velocity) manifests a linear correlation with the skewness of density fluctuations, and increases with the auto-correlation time of density fluctuations. Turbulence spreading by positive density fluctuations is outward, while spreading by negative density fluctuations is inward. The degree of symmetry breaking between outward propagating blobs and inward propagating holes increases with the amplitude of density fluctuations. Thus, blob-hole asymmetry emerges as crucial to turbulence spreading. 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These results highlight the important role of intermittent convective events in conveying the spreading of turbulence, and constitute a fundamental challenge to existing diffusive models of spreading.</description><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</subject><subject>blobs</subject><subject>edge plasma</subject><subject>holes</subject><subject>non-diffusive</subject><subject>turbulence spreading</subject><issn>0029-5515</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><recordid>eNqNjLsKwjAUQDMoWB__ENwLSdOA4iiKm4t7qbc3NlJuJDep-Pd28AOcznAOZyYKpap9aa22C7Fkfiqla21MIQ5Xkn14S04xQ8oRWUKgET-SApWddy6zH1FO6p4HJEDJr4ht5-mxFnPXDoybH1diez7djpcycPINg08I_XQjhNRUprY7bc1f0ReKGDdh</recordid><startdate>20240503</startdate><enddate>20240503</enddate><creator>Long, Ting</creator><creator>Diamond, P. 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H.</au><au>Ke, Rui</au><au>Chen, Zhipeng</au><au>Cao, Mingyun</au><au>Xu, Xin</au><au>Xu, Min</au><au>Hong, Rongjie</au><au>Tian, Wenjing</au><au>Yuan, Jinbang</au><au>Liu, Yanmin</au><au>Yan, Qinghao</au><au>Yang, Qinghu</au><au>Shen, Chengshuo</au><au>Guo, Weixin</au><au>Wang, Lu</au><au>Nie, Lin</au><au>Wang, Zhanhui</au><au>Hao, Guangzhou</au><au>Wang, Nengchao</au><au>Chen, Zhongyong</au><au>Pan, Yuan</au><au>Li, Jiquan</au><au>Chen, Wei</au><au>Zhong, Wulyu</au><aucorp>Univ. of California, San Diego, CA (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>On how structures convey non-diffusive turbulence spreading</atitle><jtitle>Nuclear fusion</jtitle><date>2024-05-03</date><risdate>2024</risdate><volume>64</volume><issue>6</issue><issn>0029-5515</issn><abstract>We report on comprehensive experimental studies of turbulence spreading in edge plasmas. These studies demonstrate the relation of turbulence spreading and entrainment to intermittent convective density fluctuation events or bursts (i.e. blobs and holes). The non-diffusive character of turbulence spreading is thus elucidated. The turbulence spreading velocity (or mean jet velocity) manifests a linear correlation with the skewness of density fluctuations, and increases with the auto-correlation time of density fluctuations. Turbulence spreading by positive density fluctuations is outward, while spreading by negative density fluctuations is inward. The degree of symmetry breaking between outward propagating blobs and inward propagating holes increases with the amplitude of density fluctuations. Thus, blob-hole asymmetry emerges as crucial to turbulence spreading. 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| subjects | 70 PLASMA PHYSICS AND FUSION TECHNOLOGY blobs edge plasma holes non-diffusive turbulence spreading |
| title | On how structures convey non-diffusive turbulence spreading |
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