Abstract
Turbulence in plasmas has been investigated experimentally and numerically.
• On the experimental side the turbulent nature of the Kelvin-Helmholtz instability has been studied in a single-ended Q-machine. The development of coherent structures in the background of the turbulent flow has been demonstrated and the capability of structures of transporting plasma across the magnetic field-lines is explained in detail. The numerical investigations are divided into two parts:
• Numerical simulations of the dynamics from the Q-machine experiments using
spectral methods to solve the two-dimensional Navier-Stokes equations in a
cylindrical geometry.
• A numerical study of the Eulerian-Lagrangian transformation in a two-dimensional flow. Here the flow is made up by a large number of structures, where each individual structure is convected by the superposed flow field of all the others.
• On the experimental side the turbulent nature of the Kelvin-Helmholtz instability has been studied in a single-ended Q-machine. The development of coherent structures in the background of the turbulent flow has been demonstrated and the capability of structures of transporting plasma across the magnetic field-lines is explained in detail. The numerical investigations are divided into two parts:
• Numerical simulations of the dynamics from the Q-machine experiments using
spectral methods to solve the two-dimensional Navier-Stokes equations in a
cylindrical geometry.
• A numerical study of the Eulerian-Lagrangian transformation in a two-dimensional flow. Here the flow is made up by a large number of structures, where each individual structure is convected by the superposed flow field of all the others.
| Original language | English |
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| Place of Publication | Roskilde |
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| Publisher | Risø National Laboratory |
| Number of pages | 80 |
| ISBN (Print) | 87-550-1865-3 |
| Publication status | Published - 1993 |
Keywords
- Risø-R-659
- Risø-R-659(EN)