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- Gaite, José A., et al.
(författare)
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Nonlinear spherical gravitational downfall of gas onto a solid ball : Analytic and numerical results
- 2003
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Ingår i: Physica D. - : Elsevier. - 0167-2789 .- 1872-8022. ; 183:1-2, s. 102-116
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Tidskriftsartikel (refereegranskat)abstract
- The process of downfall of initially homogeneous gas onto a solid ball due to the ball's gravity (relevant in astrophysical situations) is studied with a combination of analytic and numerical methods. The initial explicit solution soon becomes discontinuous and gives rise to a shock wave. Afterwards, there is a crossover between two intermediate asymptotic similarity regimes, where the shock wave propagates outwards according to two self-similar laws, initially accelerating and eventually decelerating and vanishing, leading to a static state. The numerical study allows one to investigate in detail this dynamical problem and its time evolution, verifying and complementing the analytic results on the initial solution, intermediate self-similar laws and static long-term solution.
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