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  • 1
    Electronic Resource
    Electronic Resource
    Numerical investigation of inviscid shock wave dynamics in an expansion tube (1995)
    Springer
    Shock waves 5 (1995), S. 33-45 
    Details
    ISSN: 1432-2153
    Keywords: Oscillatory jet ; Morphological transformation of shock ; Finite volume-FCT scheme ; Unstructured time-dependent adaptive mesh
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract Highly complicated shock wave dynamics has been numerically calculated by solving the Euler equations for a circular shock tube suddenly expanded three times of the original tube diameter atx=0. Shock waves of different shock Mach number,M s =1.5 and 2.0, have produced remarkably distinct blast jet structures. A planar shock wave took its final form after the blast by repeated Mach reflections of the blast wave: the first one at the wall and the second one at the central axis. The central Mach disc overtook and merged with the annular Mach stem before the planar shock wave was formed. In contrast to the blast wave which would propagate spherically in an open space, the present blast wave undergoes complex morphological transformation in the restricted flow passage, resulting in an unstable and oscillatory blast jet structure of highly rotational nature. The slipstream tube emanating from the shock tube exit corner decomposed into a chain of small vortex rings that interacted with the barrel shock of the jet, which caused periodic collapse of the jet structure. The finite volume-FCT formulation equipped with the time-dependenth-refinement adaptive unstructured triangular mesh technique in the present paper has contributed to resolution of the intricate physical discontinuities developing in the blast flow fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02425034
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  • 2
    Electronic Resource
    Electronic Resource
    On the shock–vortex interaction in Schardin's problem (2000)
    Springer
    Shock waves 10 (2000), S. 333-343 
    Details
    ISSN: 1432-2153
    Keywords: Key words: Schardin's problem, Shock–vortexlet interaction, Holographic interferometry, Shadowgraphs, Shock scattering, Adaptive finite volume method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract. In this study we revisit Schardin's problem by investigating experimentally shock waves diffracting over a finite wedge and interacting with the tip vortices in a complicated manner. Holographic interferometry and shadowgraphy were used in a shock tube for a shock Mach number $M_{\rm s}= 1.34$ . Numerical simulations were carried out to obtain complementary flow data. The experimental results show that diverging acoustic waves are generated due to the interaction between shock waves and vortexlets along the slip layer. By means of the computational results obtained for short time intervals, and the corresponding optical images, analysis of the shock-vortex interactions became possible for extended time periods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001930000061
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  • 3
    Electronic Resource
    Electronic Resource
    Reflection of shock wave from a compression corner in a particle-laden gas region (1991)
    Springer
    Shock waves 1 (1991), S. 65-73 
    Details
    ISSN: 1432-2153
    Keywords: Two phase compressible flow ; Compression corner ; Shock wave diffraction ; TVD scheme ; Particle parameters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract We investigated in this paper the progression of a shock-wave reflected from a compression corner in a particle-laden gas medium using a TVD class numerical technique and a MacCormack scheme. For a gas-only flow, the numerical results agreed well with the existing experimental data, suggesting that the gas phase is correctively solved. The effect of particle size and mass fraction ratio is investigated for a dilute gas-particle flow. It has been shown that the shock-wave diffraction and the flow configuration after the shock can become remarkably different from the gas-only flow depending on the particle parameters. Relaxation phenomenon due to the momentum drag and the heat exchange between the gas and the particle phases is explained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414869
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  • 4
    Electronic Resource
    Electronic Resource
    Inviscid transonic flow over a wavy wall decaying downstream (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Communications in Applied Numerical Methods 5 (1989), S. 219-228 
    Details
    ISSN: 0748-8025
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Inviscid transonic flow over a wavy wall with either subsonic or supersonic freestream speeds is studied by solving the Euler equations numerically. The streamwise flow development through a series of shock waves and entropy production are investigated in depth. In the case of supersonic freestream, isentropy contours of both horseshoe and staircase forms are found. The limitations and validity of this inviscid rotational flow model are discussed by comparing the results with those for viscous turbulent flow calculated previously.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cnm.1630050402
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  • 5
    Electronic Resource
    Electronic Resource
    Natural convective heat transfer over inclined short plates (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Communications in Applied Numerical Methods 4 (1988), S. 665-673 
    Details
    ISSN: 0748-8025
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A finite-difference solution for natural convection over a short flat plate heated on both sides is obtained; the plate has an arbitrary inclination angle. The present numerical method is capable of treating the full flow domain efficiently through the use of a plate/plume-fitted co-ordinate system. Correlation between the Nusselt and Rayleigh numbers at intermediate Rayleigh number region, previously obtained only through laborious measurements, is now obtained computationally. Variations of the flow patterns, isotherms and local Nusselt number with the inclination angle and the Rayleigh number are presented Results from a Mach-Zehnder interferometric study are also presented for comparison.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cnm.1630040510
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