  Using the HPC ressources of the state of Baden-W\"urttemberg, we modelled for
the first time the luminous burst from a young massive star by accretion of
material from its close environment. We found that the surroundings of young
massive stars are shaped as a clumpy disk whose fragments provoke outbursts
once they fall onto the protostar and concluded that similar strong luminous
events observed in high-mass star forming regions may be a signature of the
presence of such disks.
