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Current research interests:

I am currently interested in quantum turbulence and vortex dynamics in helium superfluids. Compared with classical fluids, vortices in helium superfluids (in the superfluid component) are very stable and have a fixed circulation. A small vortex core size makes it possible to use the vortex filament model and Biot-Savart equation to determine the vortex dynamics. My numerical research is connected to the experiments done especially by the ROTA group. However, they also relate to experiments conducted, for example, in Manchester, Lancaster, and Osaka.

Some active projects:

  • Conservation laws for energy, momentum, helicity, etc and their effect on the vortex dynamics.
  • Vortex reconnections.
  • Counterflow turbulence.
  • Decay of quantum turbulence and the role of Kelvin-waves, especially in the zero temperature limit.
  • Spin-down of the superfluid component after a sudden stop of rotation.
  • Twisted vortex state and propagating vortex front.
For more information about some other projects I refer to the helium theory page of the Low Temperature Laboratory.
Spin-down of rotating boxSpin-down of rotating box
Spin-down of cubic container at T = 0.22Tc in superfluid 3He-B.

PhD thesis:

Title: Simulations of topological defects and impurities in superfluid 3He.
Photos from the dissertation and from the Karonkka.

Master's thesis:

Title: Superfluid density of 3He-B in aerogel using an inhomogeneous scattering model.


Teaching:

Instructed PhD Thesis:

2017: Niklas Hietala, "Helical waves on quantized vortices".
2012: Janne Karimäki, "Structure and dynamics of vortices in superfluid helium-3".

Instructed Master Thesis:

2013: Niklas Hietala, "Kelvin waves and quantum turbulence".(in Finnish "Kelvinaallot kvanttiturbulenssissa").

Instructed Bachelor Thesis:

2016: Antti Rantala, "Energy dissipation from mutual friction during vortex reconnections in superfluid helium".
2010: Niklas Hietala, "Quantized vortices and their polarization during spin-down" (in Finnish "Kvantittuneet virtauspyörteet ja niiden polarisaatio spin downissa").
2008: Jonne Koski, "Vortex ring instability and Kelvin waves in helium-3 superfluid" (in Finnish "Vorteksirenkaan epästabiilisuus ja Kelvin-aallot helium-3 supranesteessä").

Publications:

My ResearcherID is E-7147-2013
Penguin Check my arXiv submissions

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-2005:

Conference talks:

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Last modified: Mon Jan 23 12:46:49 EET 2017