3D Numerical simulation of Rayleigh–Taylor instability using MAH-3 code

Abstract

A 3D numerical study of the turbulent phase of the evolution of Rayleigh–Taylor instability (RTI) was undertaken using the MAH-3 code. A criterion and a technique have been developed that can be used for diagnostics in computational experiments studying flow transition to self-similar turbulence. It has been found that a criterion of the flow transition to the self-similar turbulence is Kolmogorov's self-similar distribution of the turbulent kinetic energy together with the square law of mixing zone extension. The technique is based on the analysis of the evolution of the dimensionless power spectrum of specific kinetic energy. Three phases of nonlinear mixing are found: “relict chaos”, “formation of classical energy spectrum” and “spectrum degradation.” Determination of a proportionality factor for a square law within the time range incorporating inertial interval gives the value of α ≈ 0.07.

RFNC–VNIITF multifunctional shock tube for investigating the evolution of instabilities in nonstationary gas dynamic flows

“…This driver intends to be used for investigating the successive action of the Richtmyer-Meshkov and Rayleigh-Taylor instabilities and the turbulent mixing induced by them. One of the gases (heavier one) being investigated and having density p2 is placed into the measuring section I (5), but the l ighter gas of density p 1 is placed into the measuring section II (7). At the initial instant of time the separating membrane (5) separates gases.…”

“…This driver intends to be used for studying the Rayleigh-Taylor instability and the turbulent mixing induced by this instability. The Lighter gas of density p 1 is placed into the measuring section I (5), the other heavier gas of density p 2 is located in the measuring section II (7). The separating membrane (6) separates gases.…”

“…In the works [7,8] the numerical three-dimensional modeling of the gravitational turbulent mixing e volution has been carried out by means of different mathematical codes. In the work [7] the value of α ≈ 0.052 was obtained, but in work [8] this value is in the range of…”

Computational and Theoretical Studies of Mass-Spectrometric Measurements of the Composition of Dust Particles of the Comet Halley in Vega Experiments

“…For modeling the processes at the first stage the difference methods and software packages MECH [7][8][9][10], MAH [11][12][13], MAH-3 [14,15] and TIGR-3T [16] were used.…”