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

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F14%3A10289634" target="_blank" >RIV/00216208:11320/14:10289634 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1051/epjconf/20146702124" target="_blank" >http://dx.doi.org/10.1051/epjconf/20146702124</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/epjconf/20146702124" target="_blank" >10.1051/epjconf/20146702124</a>

Result language
angličtina
Original language name
Two-dimensional simulation of vortex points and tracer particles in counterflowing He-II
Original language description
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 velocityfield, 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.
Czech name
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Czech description
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Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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