Global Ionosphere-Thermosphere model (GITM), a non-hydrostatic model with flexible resolution, has been utilized to evaluate the influence of flow bursts, one type of localized strong enhancements of forcing on the global dynamics of the upper atmosphere. Specifically, three idealized configurations of flow burst have been examined, one flow burst with the typical spatial scale seen in the auroral zone, two neighboring flow bursts with the same spatial scale, and one flow burst with doubled spatial scale. The comparison between the cases with and without the flow burst illustrates the impact of flow burst.