O. E. Garcia, V. Naulin, A. H. Nielsen, J. Juul Rasmussen, K. Rypdal, Jp Ρm, ...
Formation and radial propagation of structures turbulent thermal convection (plumes/thermals) equatorial irregularities (bubbles/depletions) magnetically confined plasmas (blobs) Structures in the...
Divorticity and Dihelicity In Two-Dimensional Hydrodynamics (2009)
Shivamoggi, B. K., Rasmussen, J. Juul
A framework is developed based on the concepts of {\it divorticity} ${\textbf B}$($\equiv\nabla\times\bfo$, $\bfo$ being the vorticity) and $\textit{dihelicity} g \lp \equiv\bfv\cdot\textbf{B}\rp$...
Anomalous diffusion, clustering, and pinch of impurities in plasma edge turbulence (2005)
Priego, M., Garcia, O. E., Naulin, V., Rasmussen, J. Juul
The turbulent transport of impurity particles in plasma edge turbulence is investigated. The impurities are modeled as a passive fluid advected by the electric and polarization drifts, while the...
Shear Flow Generation and Energetics in Electromagnetic Turbulence (2004)
Naulin, V., Kendl, A., Garcia, O. E., Nielsen, A. H., Rasmussen, J. Juul
Zonal flows are recognised to play a crucial role for magnetised plasma confinement. The genesis of these flows out of turbulent fluctuations is therefore of significant interest. We investigate the...
Sharp vorticity gradients in two-dimensional hydrodynamic turbulence (2004)
Kuznetsov, E. A., Naulin, V., Nielsen, A. H., Rasmussen, J. Juul
The appearance of sharp vorticity gradients in two-dimensional hydrodynamic turbulence and their influence on the turbulent spectra is considered. We have developed the analog of the vortex line...
Kats, A. V., Rasmussen, J. Juul
A rigorous method for introducing the variational principle describing relativistic ideal hydrodynamic flows with all possible types of discontinuities (including shocks) is presented in the...
Phase space vortices in collisionless plasmas (2003)
P. Guio, S. Børve, J. P. Lynov, P. Michelsen, H. L. Pécseli, ...
Results on the formation and propagation of electron phase space vortices from laboratory experiments are summarized. The electron phase space vortices were excited in a strongly magnetized Q-machine...
Collapsing dynamics of attractive Bose-Einstein condensates (2000)
The self-similar collapse of 3D and quasi-2D atom condensates with negative scattering length is examined. 3D condensates are shown to blow up following the scenario of {\it weak collapse}: The inner...