How can vorticity be produced in irrotationally forced flows?

Details How can vorticity be produced in irrotationally forced flows? How can vorticity be produced in irrotationally forced flows?

2010-12-21

arxiv.org/abs/1012.4772v1

n Advances in Plasma Astrophysics, ed. Proc. IAU, Vol. 6, IAU Symp. S274, A. Bonanno, E. de Gouveia dal Pino, & A. Kosovichev,

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

3 pages, 3 figures, to appear in Proceedings of IAU Symp. 274, Advances in Plasma Astrophysics, ed. A. Bonanno, E. de Gouveia

Scientific paper

10.1017/S1743921311007307

A spherical hydrodynamical expansion flow can be described as the gradient of a potential. In that case no vorticity should be produced, but several additional mechanisms can drive its production. Here we analyze the effects of baroclinicity, rotation and shear in the case of a viscous fluid. Those flows resemble what happens in the interstellar medium. In fact in this astrophysical environment supernovae explosion are the dominant flows and, in a first approximation, they can be seen as spherical. One of the main difference is that in our numerical study we examine only weakly supersonic flows, while supernovae explosions are strongly supersonic.

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