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Abstract: To model isotropic homogeneous quantum turbulence in superfluid helium, wehave performed Direct Numerical Simulations DNS of two fluids the normalfluid and the superfluid coupled by mutual friction. We have found evidence ofstrong locking of superfluid and normal fluid along the turbulent cascade, fromthe large scale structures where only one fluid is forced down to the vorticitystructures at small scales. We have determined the residual slip velocitybetween the two fluids, and, for each fluid, the relative balance of inertial,viscous and friction forces along the scales. Our calculations show that theclassical relation between energy injection and dissipation scale is not validin quantum turbulence, but we have been able to derive a temperature-dependentsuperfluid analogous relation. Finally, we discuss our DNS results in terms ofthe current understanding of quantum turbulence, including the value of theeffective kinematic viscosity.



Autor: Philippe-Emmanuel P.-E. Roche NEEL, Carlo F. Barenghi, Emmanuel Lévêque Phys-ENS

Fuente: https://arxiv.org/







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