I review recent results from numerical simulations of a magnetized flow in
the vicinity of a black hole in the context of the collapsar model for
GRBs.The simulations show that after an initial transient, the flow settles intoa complex convolution of several distinct flow components. I discuss the
nature and connection between these components, in particular between the
inflows and related outflows. I also discuss how and under what conditions
the collapsing stellar envelope can trigger a very strong and fast outflow
that can become a super-relativistic jet.
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