arXiv subjects

A. M. Oparin

Publications and source records attributed to A. M. Oparin.

2 recordsLinked to original sources

arXiv2005

Exact Expansion Law for Richtmyer-Meshkov Turbulent Mixing Zone

Development of the Richtmyer-Meshkov instability leads to mixing of two substances separated by contact boundary. Mixture of two fluids is confined between two mixing fronts. Universal asymptotics follows the transition stage at late time. Functions which describe the fronts penetration asymptoticaly transform to power law dependences. Mixing is acompanied by cascade of enlarging of dominant scale of a turbulent mixing zone. The exponents of the power laws are: 2/5 for 2D and 1/3 for 3D cases. These exact exponents are calculated in our work. They are determined by the mechanism of redistribution of momentum from small into the large scales.

physics.flu-dyn↗

arXiv2001

Three-Dimensional Morphology of Vortex Interfaces Driven by Rayleigh-Taylor or Richtmyer-Meshkov Instability

We study the 3D topology of Rayleigh-Taylor (RT) and Richtmyer-Meshkov (RM) single-modes, which includes bubbles, jets and saddle points. We present an analytic description of the interface as a whole, for arbitrary time-dependant acceleration g(t). The dependance of morphology on the lattice - Hexagonal, square or triangular -of bubbles are investigated. RM accelerations in the case of a large density ratio produce jets well separated from each other while, in RT case, jets are connected by liquid sheets. We compare our analytic results to numerical simulations.

physics.flu-dyn↗