A straightforward procedure has been developed to quickly determine an inviscid design of a hypersonic wind tunnel nozzle when the test gas is both calorically and thermally imperfect. This real gas procedure divides the nozzle into four distinct parts: subsonic, throat to conical, conical, and turning flow regions. The design process is greatly simplified by treating the imperfect gas effects ...

In this paperwe have solved the hydrodynamic equations governing the spherically symmetric isothermal accretion (wind) onto (away from) compact objects using various pseudo-Schwarzschild potentials.These solutions are essentially one parameter solutions in a sense that all relevant dynamical as well as thermodynamic quantities for such a flow could be obtained (with the assumption of a one-temp...

over the last ten years, robustness of schemes has raised an increasing interest among the cfd community. the objective of this article is to solve the quasi-one-dimensional compressible flow inside a “shubin nozzle” and to investigate bean-warming and flux vector splitting methods for numerical solution of compressible flows. two different conditions have been considered: first, there is a sup...

Miniature heaters are immersed in flows of quantum fluid and the efficiency heat transfer is monitored versus velocity, superfluid fraction, time. The $^{4}\mathrm{He}$ helium with a fraction varied from 71% down to 0% an imposed velocity up $3\phantom{\rule{0.28em}{0ex}}\mathrm{m}/\mathrm{s}$, while characteristic sizes range $1.3\phantom{\rule{0.28em}{0ex}}\ensuremath{\mu}\mathrm{m}$ few hund...

A numerical analysis is made of the inviscid flow produced by a cylinder which accelerates from a state of rest to a constant, subsonic speed in a gas at rest. All features of the numerical solution are explained on physical grounds. Consequently, ways are suggested to computed steady subsonic lows around obstacles with a maximum accuracy and a minimum computational time. This research was supp...

We study the properties of a binary microcavity polariton superfluid coherently injected by two lasers at different momenta and energies. The crossover from the supersonic to the subsonic regime, where motion is frictionless, is described by evaluating the linear response of the system to a weak defect potential. We show that the coupling between the two components requires that either both com...