In multiphase systems it is only necessary to solve for all but one of the
moving phases. The new referencePhase option allows the user to specify which
of the moving phases should not be solved, e.g. in constant/phaseProperties of the
tutorials/multiphase/reactingMultiphaseEulerFoam/RAS/fluidisedBed tutorial case with
phases (particles air);
referencePhase air;
the particles phase is solved for and the air phase fraction and fluxes obtained
from the particles phase which provides equivalent behaviour to
reactingTwoPhaseEulerFoam and is more efficient than solving for both phases.
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