Abstract
In order to improve the performance of mixing with multiple impinging jet, we conduct the DNS (direct numerical simulation) of four round impinging jet arranged at an inflow of flow field. As control parameters, both the geometrical arrangements of jets and the separation between each jet are varied. From view of instantaneous vortical structures and time-averaged velocity distribution, it reveals that the generation of vortical structures are enhanced due to an interaction between each jet, compared to that of a single impinging jet, and that various type of upward flow which does not exist in the single one, appears according to the control parameter.
