Spatio-temporal dynamics of turbulence trapped in geodesic acoustic modes
The spatio-temporal dynamics of turbulence with the interaction of geodesic acoustic modes (GAMs) are investigated, focusing on the phase-space structure of turbulence, where the phase-space consists of real-space and wavenumber-space. Based on the wave-kinetic framework, the coupling equation betwe...
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| Veröffentlicht in: | Physics of plasmas 2018-01, Vol.25 (1) |
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| container_title | Physics of plasmas |
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| creator | Sasaki, M. Kobayashi, T. Itoh, K. Kasuya, N. Kosuga, Y. Fujisawa, A. Itoh, S.-I. |
| description | The spatio-temporal dynamics of turbulence with the interaction of geodesic acoustic modes (GAMs) are investigated, focusing on the phase-space structure of turbulence, where the phase-space consists of real-space and wavenumber-space. Based on the wave-kinetic framework, the coupling equation between the GAM and the turbulence is numerically solved. The turbulence trapped by the GAM velocity field is obtained. Due to the trapping effect, the turbulence intensity increases where the second derivative of the GAM velocity (curvature of the GAM) is negative. While, in the positive-curvature region, the turbulence is suppressed. Since the trapped turbulence propagates with the GAMs, this relationship is sustained spatially and temporally. The dynamics of the turbulence in the wavenumber spectrum are converted in the evolution of the frequency spectrum, and the simulation result is compared with the experimental observation in JFT-2M tokamak, where the similar patterns are obtained. The turbulence trapping effect is a key to understand the spatial structure of the turbulence in the presence of sheared flows. |
| doi_str_mv | 10.1063/1.5008541 |
| format | Article |
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Based on the wave-kinetic framework, the coupling equation between the GAM and the turbulence is numerically solved. The turbulence trapped by the GAM velocity field is obtained. Due to the trapping effect, the turbulence intensity increases where the second derivative of the GAM velocity (curvature of the GAM) is negative. While, in the positive-curvature region, the turbulence is suppressed. Since the trapped turbulence propagates with the GAMs, this relationship is sustained spatially and temporally. The dynamics of the turbulence in the wavenumber spectrum are converted in the evolution of the frequency spectrum, and the simulation result is compared with the experimental observation in JFT-2M tokamak, where the similar patterns are obtained. The turbulence trapping effect is a key to understand the spatial structure of the turbulence in the presence of sheared flows.</description><identifier>ISSN: 1070-664X</identifier><identifier>EISSN: 1089-7674</identifier><identifier>DOI: 10.1063/1.5008541</identifier><identifier>CODEN: PHPAEN</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Computational fluid dynamics ; Computer simulation ; Curvature ; Frequency spectrum ; Plasma physics ; Tokamak devices ; Trapping ; Turbulence intensity ; Velocity distribution ; Wavelengths</subject><ispartof>Physics of plasmas, 2018-01, Vol.25 (1)</ispartof><rights>Author(s)</rights><rights>2018 Author(s). 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Based on the wave-kinetic framework, the coupling equation between the GAM and the turbulence is numerically solved. The turbulence trapped by the GAM velocity field is obtained. Due to the trapping effect, the turbulence intensity increases where the second derivative of the GAM velocity (curvature of the GAM) is negative. While, in the positive-curvature region, the turbulence is suppressed. Since the trapped turbulence propagates with the GAMs, this relationship is sustained spatially and temporally. The dynamics of the turbulence in the wavenumber spectrum are converted in the evolution of the frequency spectrum, and the simulation result is compared with the experimental observation in JFT-2M tokamak, where the similar patterns are obtained. The turbulence trapping effect is a key to understand the spatial structure of the turbulence in the presence of sheared flows.</description><subject>Computational fluid dynamics</subject><subject>Computer simulation</subject><subject>Curvature</subject><subject>Frequency spectrum</subject><subject>Plasma physics</subject><subject>Tokamak devices</subject><subject>Trapping</subject><subject>Turbulence intensity</subject><subject>Velocity distribution</subject><subject>Wavelengths</subject><issn>1070-664X</issn><issn>1089-7674</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNp90E1LAzEQBuAgCtbqwX-w4Elha742SY9S_CgUPKjgLWSTiWxpN2uSFfrv3aVFD4KnGYaHd-BF6JLgGcGC3ZJZhbGqODlCE4LVvJRC8uNxl7gUgr-forOU1hhjLio1QcuXzuQmlBm2XYhmU7hda7aNTUXwRe5j3W-gtVDkaLoOXNG0xQcEB6mxhbGhT3lYtuPhHJ14s0lwcZhT9PZw_7p4KlfPj8vF3aq0XNJcggJK5l4pKhkHx0StDHeSOyUUIzVIxiz1lmKHMVO1teBZRcTcC1JT64BN0dU-t4vhs4eU9Tr0sR1eakpIpQgVlRzU9V7ZGFKK4HUXm62JO02wHpvSRB-aGuzN3ibb5LGN9gd_hfgLdef8f_hv8jeh5ncc</recordid><startdate>20180101</startdate><enddate>20180101</enddate><creator>Sasaki, M.</creator><creator>Kobayashi, T.</creator><creator>Itoh, K.</creator><creator>Kasuya, N.</creator><creator>Kosuga, Y.</creator><creator>Fujisawa, A.</creator><creator>Itoh, S.-I.</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0002-4075-5542</orcidid></search><sort><creationdate>20180101</creationdate><title>Spatio-temporal dynamics of turbulence trapped in geodesic acoustic modes</title><author>Sasaki, M. ; Kobayashi, T. ; Itoh, K. ; Kasuya, N. ; Kosuga, Y. ; Fujisawa, A. ; Itoh, S.-I.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c472t-e8e219f882734ed36b8a4d74d86831be733c2fc20d0038bccef35169f61b2cde3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Computational fluid dynamics</topic><topic>Computer simulation</topic><topic>Curvature</topic><topic>Frequency spectrum</topic><topic>Plasma physics</topic><topic>Tokamak devices</topic><topic>Trapping</topic><topic>Turbulence intensity</topic><topic>Velocity distribution</topic><topic>Wavelengths</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sasaki, M.</creatorcontrib><creatorcontrib>Kobayashi, T.</creatorcontrib><creatorcontrib>Itoh, K.</creatorcontrib><creatorcontrib>Kasuya, N.</creatorcontrib><creatorcontrib>Kosuga, Y.</creatorcontrib><creatorcontrib>Fujisawa, A.</creatorcontrib><creatorcontrib>Itoh, S.-I.</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Physics of plasmas</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sasaki, M.</au><au>Kobayashi, T.</au><au>Itoh, K.</au><au>Kasuya, N.</au><au>Kosuga, Y.</au><au>Fujisawa, A.</au><au>Itoh, S.-I.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Spatio-temporal dynamics of turbulence trapped in geodesic acoustic modes</atitle><jtitle>Physics of plasmas</jtitle><date>2018-01-01</date><risdate>2018</risdate><volume>25</volume><issue>1</issue><issn>1070-664X</issn><eissn>1089-7674</eissn><coden>PHPAEN</coden><abstract>The spatio-temporal dynamics of turbulence with the interaction of geodesic acoustic modes (GAMs) are investigated, focusing on the phase-space structure of turbulence, where the phase-space consists of real-space and wavenumber-space. Based on the wave-kinetic framework, the coupling equation between the GAM and the turbulence is numerically solved. The turbulence trapped by the GAM velocity field is obtained. Due to the trapping effect, the turbulence intensity increases where the second derivative of the GAM velocity (curvature of the GAM) is negative. While, in the positive-curvature region, the turbulence is suppressed. Since the trapped turbulence propagates with the GAMs, this relationship is sustained spatially and temporally. The dynamics of the turbulence in the wavenumber spectrum are converted in the evolution of the frequency spectrum, and the simulation result is compared with the experimental observation in JFT-2M tokamak, where the similar patterns are obtained. The turbulence trapping effect is a key to understand the spatial structure of the turbulence in the presence of sheared flows.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.5008541</doi><tpages>5</tpages><orcidid>https://orcid.org/0000-0002-4075-5542</orcidid><oa>free_for_read</oa></addata></record> |
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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | Computational fluid dynamics Computer simulation Curvature Frequency spectrum Plasma physics Tokamak devices Trapping Turbulence intensity Velocity distribution Wavelengths |
| title | Spatio-temporal dynamics of turbulence trapped in geodesic acoustic modes |
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