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D. J. SINGH A. KUMAR S. N. TIWARI 《International Journal of Computational Fluid Dynamics》2013,27(3):177-196
A numerical study is conducted to simulate the effects of extraneous shock impingement on a blunt body in viscous hypersonic flow. The interaction of extraneous shock with the leading-edge shock results in a very complex flow field that contains local regions of high pressure and intense heating. The heating and pressure can be orders of magnitude higher than the peak values in the absence of shock impingement. The flow field is calculated by solving thin-layer Navier-Stokes equations with a finite-volume flux splitting technique developed by van Leer. For a zero or small sweep of the body, a type IV interaction occurs, which produces a lambda shock structure with a supersonic jet embedded in the otherwise subsonic flow; for a moderate sweep of about 25°, a type V interaction occurs in which a subsonic shear layer sandwiched in supersonic flow is produced with a transmitted shock. In the present study, both type IV and type V interactions are investigated. Results of the present numerical investigation are compared with available experimental results. For the present conditions, the peak pressure is 2.2 times the unimpinged stagnation point pressure and the peak heating is 3 times the unimpinged stagnation point heating. The flow for a type IV interaction is found to be unsteady. 相似文献
73.
Monte Carlo N-particle (MCNP) code has been used to simulate the transport of gamma photon rays of different energies (22, 31, 59.5 and 81 keV) to estimate the iron content in solutions. In this study, MCNP simulation results are compared with experiment and XCOM theoretical data. The simulation shows that the obtained results are in good agreement with experimental data, and better than the theoretical XCOM values. The study indicates that MCNP simulation is an excellent tool to estimate the iron concentration in the blood samples. The MCNP code can also be utilized to estimate other trace elements in the blood samples. 相似文献
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Fission fragments and other charged particles leave tracks of permanent damage in most of the insulating solids. Damage track
detectors are useful for personal dosimeters and for flux/dose determination of high-energy particles from accelerators or
cosmic rays. A detector that has its principal response at nucleon energy above 50 MeV is provided by the fission of Bi-209.
Neutrons produce the largest percentage of hadron dose in most high-energy radiation fields. In these fields, the neutron
spectrum is typically formed by low-energy neutrons (evaporation spectrum) and high-energy neutrons (knock-on spectrum). We
used Bi-fission detectors to measure neutron peak fluence and compared the result with the calculated value of neutron peak
fluence. For the exposure to 100 MeV we have used the iThemba Facility in South Africa. 相似文献
77.
We use rationalization method to study two-dimensional complex dynamical systems (shifted harmonic oscillator in complex plane) on the extended complex phase space (ECPS). The role and scope of the derived invariants in the context of various physical problems are highlighted. 相似文献
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SINGH Anand P 《中国科学A辑(英文版)》2006,(11)
Let f and g be two permutable transcendental holomorphic maps in the plane. We shall discuss the dynamical properties of f, g and f o g and prove, among other things, that if either f has no wandering domains or f is of bounded type, then the Julia sets of f and f(g) coincide. 相似文献
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