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3-D Simulations of Kelvin-Helmholtz Instabilities in Supersonic Jets

  • P. Rossi (a1) (a2), G. Bodo (a1) (a2), S. Massaglia (a1) (a2), A. Ferrari (a1) (a2) and A. Malagoli (a1) (a2)...

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One of the key processes governing the structure and evolution of astrophysical jets is their interaction with the surrounding medium. A jet can deposit momentum and energy in the ambient medium, and entrain external material. The main physical process responsible for mixing between a jet flow and the ambient medium is the Kelvin-Helmholtz (KH) instability. We have previously analysed the 2D evolution of the axisymmetric modes of a cylindrical jet (Bodo et al 1994) and of the antisymmetric modes of a planar slab jet (Bodo et al 1995). These last are thought to give indications of the 3D evolution of the helical modes of a cylinder, since the linear behavior is very similar. In this contribution we present some preliminary results of fully 3D simulations comparing them with the mentioned 2D results.

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References

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Bodo, G., Massaglia, S., Ferrari, A. and Trussoni, E. (1994), A&A , 283, 655.
Bodo, G., Massaglia, S., Rossi, P., Ferrari, A., Rosner, R. and Malagoli, A. (1995), A&A , in press.

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