Hi again @atalavera_diez,
just to give you some feedback regarding your project:
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I would suggest increasing the domain size vertically and have the mesh refinement more in the area of the pressure fronts.
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Please change your name convention if it is possible because it is hard for me to know what your names mean.
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Try reducing the mesh size and go back to steady-state to ensure that that works before jumping into a high cell count transient simulation.
P.S.: Are you talking about the CFD Master Class - Session 1 ? The step-by-step instruction is very good and you should be on the right track using it.
Cheers,
Jousef