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Compressing turbulence and sudden viscous dissipation with compression-dependent ionization state.

Seth Davidovits1, Nathaniel J Fisch2

  • 1Princeton University, Princeton, New Jersey 08544, USA.

Physical Review. E
|December 15, 2016
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Summary

Sudden dissipation of turbulent plasma flow under compression can be prevented by increasing ionization. Ionization during compression leads to greater turbulent energy increases, influencing whether turbulent energy grows or decreases.

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Area of Science:

  • Plasma physics
  • Fluid dynamics
  • Astrophysical phenomena

Background:

  • Turbulent plasma flow can dissipate under rapid 3D compression.
  • This dissipation is linked to plasma viscosity's temperature dependence (μ∼T^{5/2}).
  • Plasma viscosity is also influenced by its ionization state.

Purpose of the Study:

  • Investigate the effect of increasing plasma ionization state on sudden dissipation during compression.
  • Determine conditions for preventing sudden dissipation.
  • Analyze the role of ionization in turbulent energy evolution.

Main Methods:

  • Simulations of turbulent plasma flow under controlled 3D compression.
  • Varying plasma ionization states during compression.
  • Analysis of plasma viscosity and turbulent energy dynamics.

Main Results:

  • Sudden dissipation can be prevented by increasing plasma ionization during compression.
  • A specific regime of net viscosity dependence on compression guarantees sudden dissipation.
  • Ionization during compression results in larger turbulent energy increases compared to non-ionized cases.
  • Ionization can determine whether turbulent energy grows or decreases.

Conclusions:

  • Plasma ionization state is a critical factor in turbulent plasma dissipation under compression.
  • Controlling ionization offers a method to manage turbulent energy in compressed plasmas.
  • Findings have implications for understanding phenomena in astrophysics and fusion research.