We investigate the effects of radiation pressure on the atmospheres of A, F and G-supergiants by calculating hydrodynamical model atmospheres for stars with 5500 ≤ Teff ≤ 9500 K. In the subsonic part of the wind, the radiation pressure by continuum and lines from Kurucz (1992) is taken into account. In the supersonic part of the wind, the radiation pressure is expressed in terms of the force mu...

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...

The equations of RFD can be written as a hyperbolic system of conservation laws by choosing an appropriate vector of unknowns. We give an explicit formulation of the full spectral decomposition of the Jacobian matrices associated to the uxes in each spatial direction, which is the essential ingredient of the techniques we propose in this paper. These techniques are based on the recently derived...

Numerical studies have been carried out using a validated two-dimensional standard k-omega turbulence model for the design optimization of a thrust vector control system using shock induced self-impinging supersonic secondary double jet. Parametric analytical studies have been carried out at different secondary injection locations to identifying the highest unsymmetrical distribution of the mai...

The Earth’s magnetosphere is permanently influenced by the solar wind. When supersonic and superalfvenic plasma flow interacts with magnetosphere, magnetosheath region formed, which filled shocked turbulent plasma. Varying SW parameters influence mechanisms of formation this boundary layer, including dynamics turbulence behind bow shock. effect wind on development in was demonstrated recently b...

The response of a supersonic cavity to open-loop forcing with a pulsed-blowing actuator is explored experimentally. It is shown that excitation at frequencies near the Rossiter modes are amplified, while frequencies between the first two Rossiter modes are attenuated. The results clearly demonstrate that the Rossiter modes in the supersonic cavity are weakly damped (not self-excited) modes. The...

Abstract In the frame of RETALT (RETro propulsion Assisted Landing Technologies) project, aerodynamics reusable launch vehicles reentering atmosphere and descending landing with aid retro are studied. particular, series wind tunnel tests performed to assess aerodynamic properties such a vehicle in various flight phases from hypersonic supersonic re-entry down subsonic conditions at touch down. ...