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Numerical simulations show that adding an optimized mode to random interface disturbances can significantly slow down Rayleigh-Taylor (RT) mixing in viscous fluids. This finding may apply to diffusion processes like concentration and thermal diffusion.

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Area of Science:

  • Fluid Dynamics
  • Computational Physics

Background:

  • Rayleigh-Taylor (RT) mixing occurs at the interface of accelerated fluids with different densities.
  • Random interface disturbances typically enhance mixing, leading to complex interfacial structures.

Purpose of the Study:

  • To investigate the effect of superimposed modes on RT mixing dynamics.
  • To identify an optimized mode that can suppress RT mixing.

Main Methods:

  • Numerical simulation of incompressible viscous fluid mixing.
  • Analysis of ensemble-averaged spike velocity under modified interface conditions.

Main Results:

  • Superimposing an optimized mode significantly retards the ensemble-averaged spike velocity.
  • The optimal mode's wavenumber balances suppression of long-wavelength modes with sufficient velocity for effective density-gradient layer growth.

Conclusions:

  • An optimized suppressing mode can effectively control RT mixing.
  • This principle may extend to RT mixing phenomena involving diffusion processes like concentration and thermal diffusion.