[saurabhg2014]

I am simulating a flow which has solid particles dispersed in liquid medium. volume fraction of solid particles lies between 10-20 %. solid phase is distributed throughout the fluid volume so there is no definite interface between solid & liquid phases. now my questions are:
1) which multiphase model is best suitable for this problem among vof, mixture & eulerian?
2)is it essential to define a interface in vof model? what if secondary phase is scattered through out the volume and there is no distinct boundary between two phases..