 The simulation represents a developing liquid sheet entering a stationary medium. The inputs are such that the initial height of the inlet is only about a tenth of a millimeter, so comparable with the width of a human hair. The top picture shows the 3D flow structure and is coloured with the magnet of velocity. The bottom picture shows counterlines on a two-dimensional plane with the normal along the spine-wise direction of the sheet. We can appreciate that over a relatively short distance, the flow structure loses its coherence and becomes fragmented. The main objective for this computation is to check how quickly this process occurs and to obtain the characteristics of the resulting dispersion.