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Related Experiment Videos

Stability of an impulsively accelerated density interface in magnetohydrodynamics.

V Wheatley1, D I Pullin, R Samtaney

  • 1Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, California 91125, USA.

Physical Review Letters
|October 4, 2005
PubMed
Summary

The magnetic field does not affect the initial growth of the Richtmyer-Meshkov instability but suppresses its amplitude, stabilizing the density interface. This magnetic stabilization is confirmed by numerical simulations.

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Area of Science:

  • Fluid dynamics
  • Plasma physics
  • Magnetohydrodynamics

Background:

  • The Richtmyer-Meshkov instability is crucial in various physical phenomena.
  • Understanding instability mitigation is vital for controlling fluid interfaces.

Purpose of the Study:

  • To investigate the effect of a parallel magnetic field on the stability of an impulsively accelerated density interface.
  • To model the Richtmyer-Meshkov instability under magnetohydrodynamic conditions.

Main Methods:

  • Analytical solution of the linearized initial value problem in ideal incompressible magnetohydrodynamics.
  • Comparison with linearized and nonlinear compressible numerical simulations.

Main Results:

  • The initial growth rate of the interface remains unaffected by the magnetic field.

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  • A finite magnetic field causes the interface amplitude to asymptote to a constant value, suppressing the instability.
  • Analytical results align with numerical simulation outcomes.

    • Conclusions:

    • The presence of a magnetic field parallel to the acceleration effectively suppresses the Richtmyer-Meshkov instability.
    • Magnetic fields offer a mechanism for stabilizing accelerating density interfaces.