Turbulent statistics and intermittency enhancement in coflowing superfluid He-4

L. Biferale; D. Khomenko; V. L'vov; A. Pomyalov; I. Procaccia; G. Sahoo

doi:10.1103/PhysRevFluids.3.024605

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Turbulent statistics and intermittency enhancement in coflowing superfluid He-4

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Turbulent statistics and intermittency enhancement in coflowing superfluid He-4

L. Biferale, D. Khomenko, V. L'vov, A. Pomyalov, I. Procaccia and G. Sahoo

Physical review fluids, Vol.3(2), 024605

21/Feb/2018

DOI: https://doi.org/10.1103/PhysRevFluids.3.024605

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http://arxiv.org/abs/1711.08246v1View

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http://hdl.handle.net/10138/307162View

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Abstract

The large-scale turbulent statistics of mechanically driven superfluid He4 was shown experimentally to follow the classical counterpart. In this paper, we use direct numerical simulations to study the whole range of scales in a range of temperatures T [1.3,2.1] K. The numerics employ self-consistent and nonlinearly coupled normal and superfluid components. The main results are that (i) the velocity fluctuations of normal and super components are well correlated in the inertial range of scales, but decorrelate at small scales. (ii) The energy transfer by mutual friction between components is particularly efficient in the temperature range between 1.8 and 2 K, leading to enhancement of small-scale intermittency for these temperatures. (iii) At low T and close to Tλ, the scaling properties of the energy spectra and structure functions of the two components are approaching those of classical hydrodynamic turbulence.

Details

Title: Turbulent statistics and intermittency enhancement in coflowing superfluid He-4
Creators: L. Biferale - Sapienza University of Rome (Italy, Rome)
D. Khomenko - 972WIS_INST___136
V. L'vov - 972WIS_INST___136
A. Pomyalov - 972WIS_INST___136
I. Procaccia - 972WIS_INST___136
G. Sahoo - University of Helsinki (Finland, Helsinki) - UH
Resource Type: Journal article
Publication Details: Physical review fluids, Vol.3(2), 024605; 21/Feb/2018
Number of pages: 16
Language: English
DOI: https://doi.org/10.1103/PhysRevFluids.3.024605
Grant note: We acknowledge funding from the Prace project “Superfluid Turbulence under Counter-flows” (Pra12_ 3088). L.B. and G.S. acknowledge funding from the European Union's Seventh Framework Programme (No. FP7/2007-2013) under Grant Agreement No. 339032. We acknowledge useful discussions with L. Skrbek.
Record Identifier: 993267859103596

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