Direct numerical simulations have been performed to study the behaviour of multiple square jets issuing normally into a cross-flow.The jets are arranged side-by-side in spanwise direction in twin jet configuration and with addition third jet downstream along the centre line in tandem jets configuration.The simulations are carried out for the jet-to-jet adjacent edge distances of 1D and 2D in twin jets case and 2D for in tandem jets case, where D is the jet width.The simulation uses the jet to cross-flow velocity ratio of 2.5 and the Reynolds number based on the free-stream quantities and the jet width is 225.The predicted flow features show that the downstream merging between the two counter rotating vortex pairs (CRVP) in the twin jets configuration is strongly dependent on the jet-to-jet edge distance.