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  • 1
    Electronic Resource
    Electronic Resource
    Rarefaction wave and gravitational equilibrium in a two-phase liquid-vapor medium (1999)
    Springer
    Journal of experimental and theoretical physics 88 (1999), S. 1143-1150 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The problems studied in this paper involve the action of laser radiation or a particle beam on a condensed material. Such an interaction produces a hot corona, and the recoil momentum accelerates the cold matter. In the coordinate frame tied to the accelerated target, the acceleration is equivalent to the acceleration of gravity. For this reason, the density distribution ρ is hydrostatic in the zeroth approximation. In this paper the structure of such a flow is studied for a two-phase equation of state. It is shown that instead of a power-law density profile, which obtains for a constant specific-heat ratio, a complicated distribution containing a region with a sharp variation of ρ arises. Similar characteristics of the density profile arise with isochoric heating of matter by an ultrashort laser pulse and the subsequent expansion of the heated layer. The formation of a rarefaction wave and the interaction of oppositely propagating rarefaction waves in a two-phase medium are studied. It is very important to take account of the two-phase nature of the material, since conditions (p a ∼1 Mbar) are often realized under which the foil material comes after expansion into the two-phase region of the phase diagram.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558903
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  • 2
    Electronic Resource
    Electronic Resource
    Development of Rayleigh-Taylor and Richtmyer-Meshkov instabilities in three-dimensional space: Topology of vortex surfaces (1999)
    Springer
    JETP letters 69 (1999), S. 739-746 
    Details
    ISSN: 1090-6487
    Keywords: 47.20.−k ; 47.32.Cc ; 47.55.Dz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The evolution of the boundary of a liquid during the development of mixing instabilities is studied. The vortex filaments, which transport liquid masses, are generators of the boundary surface. There is a fundamental difference between two-dimensional (2D) and three-dimensional (3D) motions. In the first case the vortices are rectilinear in planar geometry (2Dp) and ring-shaped in axisymmetric geometry (2Da). In the second case the vortices are very complicated. Spatially periodic (“single-mode”) solutions, which are important in mixing theory, are investigated. These solutions describe one-dimensional chains of alternating bubbles and jets in 2Dp geometry and planar (two-dimensional) arrays or lattices of bubbles and jets in 3D geometry. An analytical description is obtained for the basic types of arrays (rectangular, hexagonal, and triangular). The analysis agrees with the results of numerical simulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568084
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  • 3
    Electronic Resource
    Electronic Resource
    Expansion of matter heated by an ultrashort laser pulse (1999)
    Springer
    JETP letters 69 (1999), S. 310-316 
    Details
    ISSN: 1090-6487
    Keywords: 52.50.Jm ; 65.70.+y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent experiments have utilizied high-power subpicosecond laser pulses to effect the ultrafast heating of a condensed material to temperatures far above the critical temperature. Using optical diagnostics it was established that a complicated density profile with sharp gradients, differing substantially from an ordinary rarefaction wave, forms in the expanding heated matter. The present letter is devoted to the analysis of the expansion of matter under the conditions of the experiments reported by D. von der Linde, K. Sokolowski-Tinten, and J. Bialkowski, Appl. Surf. Science 109/110, 1 (1996); K. Sokolowski-Tinten, J. Bialkowski, A. Cavalleri et al., Proc. Soc. Photo-Opt. Instum. Eng. 3343, 46 (1998); and, K. Sokolowski-Tinten, J. Bialkowski, A. Cavalleri et al., Phys. Rev. Lett. 81, 224 (1998). It is shown that if the unloading adiabat passes through the two-phase region, a thin liquid shell filled with low-density two-phase matter forms in the expanding material. The shell moves with a constant velocity. The velocity in the two-phase material is a linear function of the coordinate (flow with uniform deformation), and the density is independent of the coordinate and decreases with time as t −1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568029
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular-dynamics simulation of rarefaction waves in media that can undergo phase transitions (2000)
    Springer
    JETP letters 71 (2000), S. 167-172 
    Details
    ISSN: 1090-6487
    Keywords: 47.40.−x ; 62.50.+p ; 64.70.Fx ; 65.70.+y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The expansion of an instantly heated planar layer of condensed matter into a vacuum is investigated. It is shown that, as the result of a phase transition, a liquid shell characterized by a constant density and filled with matter in a two-phase state is formed in a rarefaction wave. By measuring the velocity of the shell and its density and mass, it is possible to obtain important information about the behavior of matter in the near-critical region of the phase diagram, where both experimental and theoretical investigations are complicated. Problems associated with the kinetics of the phase transition in rarefaction waves are investigated in detail. This investigation is based on a direct computer simulation of the dynamics of atoms and is free from any assumptions usually used in phenomenologically describing the fluctuation kinetics of the liquid-vapor transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568306
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  • 5
    Electronic Resource
    Electronic Resource
    On the spectral and statistical properties of Rayleigh-Taylor mixing (2000)
    Springer
    JETP letters 72 (2000), S. 490-494 
    Details
    ISSN: 1090-6487
    Keywords: 47.20.Bp ; 47.20.Ma ; 47.27.Eq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Dynamics of turbulent mixing due to the Rayleigh-Taylor instability is considered. The mixing layer consists of a single horizontal array of large-scale structures. The characteristics of these structures are studied by the spectral and statistical methods. Mixing stimulation by long-wavelength noise is studied. It is demonstrated that, for typical homogeneous unscaled noise, self-similarity h∝t 2 is retained. The threshold amplitude of random broadband noise is determined, below which this noise can be ignored. The mixing deceleration by the side boundaries is studied. The stimulation and deceleration effects sizably influence the mixing coefficient α+, increasing and decreasing it, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1343149
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  • 6
    Electronic Resource
    Electronic Resource
    Partial suppression of hydrodynamic mixing in profiled shells (1997)
    Springer
    Journal of experimental and theoretical physics 84 (1997), S. 746-757 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The problems of stability and mixing are important in the physics of high-energy densities. Ablation-induced acceleration of foils and compression of liners entail loss of symmetry and the development of instability. The most destructive instability is the fundamental f − mode, which conserves the pressure in Lagrangian particles. A means has been proposed to eliminate this dangerous mode, based on special profiling of the mass distribution among the subshells. The presence of this mode has led to novel proposals for limiting the degree of instability and optimization of the shells by profiling in the important case of very large density ratios at the ablation front. The solution is based on a class of new polytropes with an inverted density profile and a negative polytrope index N. In this class the density ρ of the material does not decrease towards the boundary with the vacuum, as for ordinary polytropes with N〉0, but rather increases. This permits modeling multilayer distributions of ρ typical of inertial confinement fusion systems in which the high-density subshells form an inner core surrounding a low-pressure cavity, and the outer layers are made from low-density materials (plastic, foam type materials, composites). It is emphasized that the distributions are self-similar, and hence both the linear and the turbulent dynamics are scale-invariant. The spectral problem of perturbations in an incompressible fluid has a hidden symmetry. Isospectral deformations of the density profile I{ρ 0(y)} are known that leave the spectrum unchanged. It is of interest to apply the transformation I to the invariant f ± modes, since they are not tied to any specific profile of ρ 0(y). This paper analyzes a new type of invariant mode obtained in this way.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558207
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  • 7
    Electronic Resource
    Electronic Resource
    Three-dimensional array structures associated with Richtmyer-Meshkov and Rayleigh-Taylor instability (1999)
    Springer
    Journal of experimental and theoretical physics 89 (1999), S. 481-499 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A boundary separating adjacent gas or liquid media is frequently unstable. Richtmyer-Meshkov and Rayleigh-Taylor instability cause the growth of intricate structures on such boundaries. All the lattice symmetries [rectangular (pmm2), square (p4mm), hexagonal (p6mm), and triangular (p3m1) lattices] which are of interest in connection with the instability of the surface of a fluid are studied for the first time. They are obtained from initial disturbances consisting of one (planar case, two-dimensional flow), two (rectangular cells), or three (hexagons and triangles) harmonic waves. It is shown that the dynamic system undergoes a transition during development from an initial, weakly disturbed state to a limiting or asymptotic stationary state (stationary point). The stability of these points (stationary states) is investigated. It is shown that the stationary states are stable toward large-scale disturbances both in the case of Richtmyer-Meshkov instability and in the case of Rayleigh-Taylor instability. It is discovered that the symmetry increases as the system evolves in certain cases. In one example the initial Richtmyer-Meshkov or Rayleigh-Taylor disturbance is a sum of two waves perpendicular to one another with equal wave numbers, but unequal amplitudes: a 1(t=0)≠a 2(t=0). Then, during evolution, the flow has p2 symmetry (rotation relative to the vertical axis by 180°), which goes over to p4 symmetry (rotation by 90°) at t→∞, since the amplitudes equalize in the stationary state: a 1(t=∞)=a 2(t=∞). It is shown that the hexagonal and triangular arrays are complementary. Upon time inversion (t→−t), “rephasing” occurs, and the bubbles of a hexagonal array transform into jets of a triangular array and vice versa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.559007
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  • 8
    Electronic Resource
    Electronic Resource
    Composition of comet Halley dust particles from Vega observations (1986)
    [s.l.] : Nature Publishing Group
    Nature 321 (1986), S. 280-282 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The heart of the PUMA instrument is a time-of-flight mass spectrometer as described, for example, in ref. 2. When a dust particle strikes the target in front of the spectrometer, ions are formed, and those with positive charge are mass-analysed. Onboard electronics and microprocessor-control allow ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/321280a0
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  • 9
    Electronic Resource
    Electronic Resource
    Singular self-similar superdense compression regimes for laser targets (1980)
    Springer
    Journal of applied mechanics and technical physics 21 (1980), S. 449-452 
    Details
    ISSN: 1573-8620
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00916476
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  • 10
    Electronic Resource
    Electronic Resource
    Evolution of singular points and interfaces separating the domain of residence of these points from the fluid (1996)
    Springer
    Journal of applied mechanics and technical physics 37 (1996), S. 692-702 
    Details
    ISSN: 1573-8620
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02369308
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