Statistics – Computation
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.221..687s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 221, Aug. 1, 1986, p. 687-706.
Statistics
Computation
25
Inviscid Flow, Plasma Interactions, Stellar Mass Accretion, Stellar Winds, Computational Astrophysics, Drag Coefficients, Euler Equations Of Motion, Hydrodynamic Equations
Scientific paper
The formation of a contact discontinuity (astropause) by the noninterpenetrating interaction of a stellar wind and an axisymmetric accretion flow of the same ideal gas is investigated by means of numerical simulations based on the inviscid Euler equation and a second-order upwind finite-difference scheme (Osher and Chakravarthy, 1983). Density and entropy contours for simulations without gravity at Mach 0.6, 2, and 5 and with gravity at Mach 2, 2.3, 3, and 6 (at different density ratios) are presented graphically and analyzed in terms of standoff distance and drag coefficient. Below a critical gas pressure on the body surface or above a critical Mach number, the wind is found to terminate suddenly, with very unsteady flow in the transitional regime. Above the critical pressure, formation of a supersonic bubble within the bulletlike shock surrounding the body is shown to make the astropause unstable. From the drag computations it is inferred that the star losing mass experiences thrust (the rocket effect) as it moves through the interstellar medium.
Inaguchi Takashi
Matsuda Takuya
Shima Eiji
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