particle model
 

Hi

I have 3 fluids
Air - COntinuous fluid
Water- COntinuous fluid
LNG- dispersed fluid

I chose homogeneous free surface model for multiphase.
Under fluid pairs models ,I have selected particle and free surface.
I want to know whether this is eulerian lagrangian model or eulerian-eulerian model. How should i express the mass, momentum and energy equations.