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Two-dimensional simulation of vortex points and tracer particles in counterflowing He-II

Lookup NU author(s): Professor Carlo Barenghi, Emeritus Professor Yuri Sergeev

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Abstract

The article presents results obtained based on numerical simulation of two-dimensional vortex points and inertial tracer particles in two-component counterflowing superfluid He-II. In the low temperature limit (no normal fluid, no friction) our model would reduce to Onsager’s famous vortex gas. The flow of the normal component of the He-II is assumed uniform, while the superfluid velocity field is induced by vortex points which model three-dimensional quantized vortex lines. Probability density functions of velocity and acceleration of tracer particles and superfluid velocity field are obtained. We find that tails of probability distributions follow power-laws with various exponents, except in the case of sufficiently coarse-grained superfluid velocity field, where Gaussian shape is observed. The decay of the number of vortices is also studied, yielding results in agreement with Vinen’s phenomenological model of quantum turbulence.

Publication metadata

Author(s): Varga E, Barenghi CF, Sergeev YA, Skrbek L

Publication type: Article

Publication status: Published

Journal: EPJ - The European Physical Journal (WoC)

Year: 2014

Volume: 67

Pages: 1-6

Print publication date: 25/03/2014

Date deposited: 14/05/2014

ISSN (electronic): 2100-014X

Publisher: EDP Sciences

URL: http://dx.doi.org/10.1051/epjconf/20146702124

DOI: 10.1051/epjconf/20146702124

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