Instability of Astrophysical Jets. I : Numerical Simulation of Axisymmetric Opposing Jets : Astrophysics and Relativity

概要

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Gas dynamical aspects of astrophysical jets as well as laboratory jets are considered using a time-dependent two-dimensional Eulerian code. First, axisymmetric underexpanded jets are computed to test our computer code. Second, axisymmetric supersonic matched jets are computed using two different types of boundary conditions. It is found that our ambient gas condition applied on the outer boundary does not give an artificial reflection of shock waves and it is superior to other boundary conditions. Third, the instability of the working surface observed in the above simulations is investigated by computing an opposing jet or a forward-facing jet, and the results are compared with experiments. A mechanism of the instability is discussed.
理論物理学刊行会の論文
1990-11-25