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We have studied the evolution of HuBi 1-like planetary nebulae, consideringseveral stages of mass injection. We have carried out numerical ionization+1Dhydrodynamics+atomic/ionic rate models with our code Coral 1D to reproduceplanetary nebulae that present multiple shells produced by different ejectionevents around the ionizing source. Furthermore, we are interested in comparingnumerical simulations with H$\alpha$ and [NII]$\lambda$6584 emission structuresand the position-velocity diagrams observed in HuBi 1. This object also has aphase where it has drastically decreased the injection of ionized photonsejected from the source. The result of these different stages of ejection is anebula with intense [NII] line emission in the inner part of the planetarynebula and an extended HII recombination line emission around the central zone.The model for HuBi 1 shows the capability of our code to explain thehydrodynamical and photoionization evolution in ionization nebulae. This is ourfirst step with a 1D code to study these two physical phenomena at the sametime.

Numerical models of planetary nebulae with different episodes of mass ejection: the particular case of HuBi 1