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Partial elimination has been implemented for the multiphase Euler-Euler solver. This does a linear solution of the drag system when calculating flux and velocity corrections after the solution of the pressure equation. This can improve the behaviour of the solution in the event that the drag coupling is high. It is controlled by means of a "partialElimination" switch within the PIMPLE control dictionary in fvSolution. A re-organisation has also been done in order to remove the exposure of the sub-modelling from the top-level solver. Rather than looping the drag, virtual mass, lift, etc..., models directly, the solver now calls a set of phase-system methods which group the different force terms. These new methods are documented in MomentumTransferPhaseSystem.H. Many other accessors have been removed as a consequence of this grouping. A bug was also fixed whereby the face-based algorithm was not transferring the momentum associated with a given interfacial mass transfer.