Subdominant modes in zonal-flow-regulated turbulence
From numerical solutions of a gyrokinetic model for ion temperature gradient turbulence it is shown that nonlinear coupling is dominated by three-wave interactions that include spectral components of the zonal flow and damped subdominant modes. Zonal flows dissipate very little energy injected by th...
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| Veröffentlicht in: | Physical review letters 2014-03, Vol.112 (9), p.095002-095002, Article 095002 |
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| container_title | Physical review letters |
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| creator | Makwana, K D Terry, P W Pueschel, M J Hatch, D R |
| description | From numerical solutions of a gyrokinetic model for ion temperature gradient turbulence it is shown that nonlinear coupling is dominated by three-wave interactions that include spectral components of the zonal flow and damped subdominant modes. Zonal flows dissipate very little energy injected by the instability, but facilitate its transfer from the unstable mode to dissipative subdominant modes, in part due to the small frequency sum of such triplets. Although energy is transferred to higher wave numbers, consistent with shearing, a large fraction is transferred to damped subdominant modes within the instability range. This is a new aspect of regulation of turbulence by zonal flows. |
| doi_str_mv | 10.1103/PhysRevLett.112.095002 |
| format | Article |
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| identifier | ISSN: 0031-9007 |
| ispartof | Physical review letters, 2014-03, Vol.112 (9), p.095002-095002, Article 095002 |
| issn | 0031-9007 1079-7114 |
| language | eng |
| recordid | cdi_osti_scitechconnect_1212003 |
| source | American Physical Society Journals |
| subjects | Computational fluid dynamics Dissipation Fluid flow Instability Mathematical models Stability Turbulence Turbulent flow |
| title | Subdominant modes in zonal-flow-regulated turbulence |
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