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In this thesis we discussed the expansion behaviour of an ultracold bosonic gas from an initial harmonic confinement. We studied the reaction of the non-interacting system to changes of the trap frequency ω and of the strongly interacting system to changes of the number of Mott insulating particles NMI in the initial state and the interaction U/J. The total number of particles is kept constant for the different simulations, which are performed by means of the Bosonic Gutzwiller approach...