Structure evolution diagram of the 20 M⊙ star with Z = 0.002 and an initial rotation rate 40% of critical velocity (υini/υcrit = 0.4). The ordinate represents the enclosed mass and the abscissa the time left until the last model, which is in-between core oxygen burning and core silicon burning. The gray zones indicate convective zones. The blue dots mark shells which are unstable to dynamical shear. They can either mark a single unstable zone or an extended region, which is bounded by shear stable layers. The circled numbers refer to different situations in which dynamical shear occurs in stellar models as given in the list in Sect. 3.2. The core and shell burning regions are indicated with the corresponding element symbol. The vertical dashed line indicates the time that was used as the initial condition for the 2D hydrodynamic simulation. The red area marks the spatial and temporal extent of the 2D simulation.
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