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Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
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Dynamic evolution of Rayleigh-Taylor bubbles from sinusoidal, W-shaped, and random perturbations
Zhi-Rui Zhou1, You-Sheng Zhang1,2, Bao-Lin Tian1,2
1Institute of Applied Physics and Computational Mathematics, Beijing 100094, China.
Physical Review. E
|May 20, 2018
Summary
Simulations of Rayleigh-Taylor instability reveal distinct bubble dynamics. Chaotic bubbles exhibit self-similar growth, linking their evolution to semibounded, isolated bubbles, unlike bounded, periodic ones.
Area of Science:
- Fluid dynamics
- Plasma physics
- Astrophysical phenomena
Background:
- Rayleigh-Taylor instability is crucial in various physical systems.
- Understanding bubble dynamics is key to modeling complex fluid behaviors.
Purpose of the Study:
- Investigate late-time bubble dynamics in 2D Rayleigh-Taylor instability.
- Analyze bubble evolution across different density ratios and perturbation types.
Main Methods:
- Implicit large eddy simulations (ILES) used.
- Three perturbation types: sinusoidal, W-shaped, and random short-wave.
- Analysis of bubble height, velocity, and diameter over time.
Main Results:
- Confirmed Goncharov's terminal speed prediction for periodic perturbations.
- Identified self-similar growth and a steady aspect ratio for chaotic bubbles.
- Derived a relationship connecting chaotic and semibounded bubble dynamics.
Conclusions:
- Chaotic bubble dynamics resemble semibounded, isolated bubbles.
- Bubble evolution differs significantly between bounded periodic and chaotic regimes.
- New relationship provides insights into self-similar bubble growth mechanisms.
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