Turbulent cascade of Kelvin Waves on vortex filaments

Baggaley, AW; Barenghi, CF

doi:10.1088/1742-6596/318/6/062001

Turbulent cascade of Kelvin Waves on vortex filaments

Lookup NU author(s): Dr Andrew Baggaley ORCiD, Professor Carlo Barenghi

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Abstract

By numerically integrating in time the motion of vortex filaments, we study how the nonlinear interaction of Kelvin waves along vortices generates Kelvin waves of larger and larger wavenumbers (smaller and smaller wavelength). At sufficiently large wavenumbers the angular velocity of the vortices is large enough that kinetic energy is lost by sound emission. This turbulent cascade of Kelvin waves should explain why turbulence, generated in superfluid helium at very low temperature near absolute zero, quickly decays, despite the lack of any viscous dissipation.