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We have combined time dependent hydrodynamics with a two-fluid model for dustdriven AGB winds. Our calculations include self-consistent gas chemistry, grainformation and growth, and a new implementation of the viscous momentum transferbetween grains and gas. This allows us to perform calculations in which noassumptions about the completeness of momentum coupling are made. We derive newexpressions to treat time dependent and non-equilibrium drift in a hydro code.Using a stationary state calculation for IRC +10216 as initial model, the timedependent integration leads to a quasi-periodic mass loss in the case wheredust drift is taken into account. The time scale of the variation is of theorder of a few hundred years, which corresponds to the time scale needed toexplain the shell structure of the envelope of IRC +10216 and other AGB andpost-AGB stars, which has been a puzzle since its discovery. No suchperiodicity is observed in comparison models without drift between dust andgas.Comment: 17 pages, 9 figures, accepted by A&

Origin of quasi-periodic shells in dust forming AGB winds