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06:53
Scanning SQUID Study of Vortex Manipulation by Local Contact
Published on: February 1, 2017
Vortex locking in direct numerical simulations of quantum turbulence
Karla Morris1, Joel Koplik, Damian W I Rouson
1Department of Mechanical Engineering, City College of the City University of New York, New York, New York 10031, USA.
Physical Review Letters
|September 4, 2008
Summary
Quantized superfluid vortices lock onto normal fluid vorticity in turbulent flows. This phenomenon, observed via direct numerical simulations, occurs on larger length scales than the spacing between vortices.
Area of Science:
- Fluid dynamics
- Quantum turbulence
- Computational physics
Background:
- Superfluidity involves quantized vortices, while normal fluids exhibit vorticity.
- Turbulent flows are complex and challenging to simulate.
- Understanding the interaction between superfluid and normal fluid components is crucial.
Purpose of the Study:
- To investigate the locking phenomenon between quantized superfluid vortices and normal fluid vorticity.
- To analyze vortex dynamics in evolving turbulent flow scenarios.
- To provide numerical evidence for vortex locking mechanisms.
Main Methods:
- Direct numerical simulations (DNS) were employed.
- Two distinct normal fluid flow conditions were simulated: decaying Taylor-Green flow and forced homogeneous isotropic turbulence.
- Correlation functions and wavelet transforms were utilized for analysis.
Main Results:
- Numerical and visual evidence of vortex locking was obtained.
- The locking was observed on length scales exceeding the intervortex spacing.
- The superfluid was driven by the normal fluid, with its back reaction neglected.
Conclusions:
- Quantized superfluid vortices exhibit locking behavior with normal fluid vorticity.
- This locking occurs at larger scales within the turbulent flow.
- The findings contribute to the understanding of quantum turbulence interactions.
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