Results from a discrete particle model used to simulate secondary gas injection in a quasi-2D bed containing 50 000 particles are presented. A discrete particle model was chosen because changes in local phenomena are being sought, e.g. local porosities.

Initial simulations were conducted on a system involving one secondary injection point in the middle of the simulated bed. The parameters studied were bubble size and local porosity. By comparing simulations with secondary injection to those without, the change in bubble size and local porosity could be obtained, allowing us to determine the magnitude of the effects as well as how far the effects extend into the bed. Further simulations include additional injection points in various orientations to determine whether any interactions exist between them, such as whether the effect is amplified or simply lengthened.

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