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[FAQ]

The main motivation behind using the hybrid approach Dense Discrete Particle Model is taking into account the fluid displacement which becomes important whenever the volume loading of the disperse phase is bigger than 10%. In order to take into account for this volumetric blockage of the secondary phase the “Discrete Phase Domain” has to be set to the corresponding phase otherwise the primary phase would be only affected by drag forces (and other non-drag forces if selected) and the volume fraction of the secondary phase remains zero as no displacement is taken into account. The input is required even if only one secondary phase is present to make the check of whether it is worthy to run Dense Discrete Phase Model or to stick to classic Discrete Phase Model more customer convenient by just examining the value of the volume fraction of the secondary phase. At last but not least and to get the whole benefits from of Dense Discrete Phase Model it is mandatory to assign under Discrete Phase Domain the related secondary phase and the (volumetric) link to the primary phase will be then established.