which Model to be used for phase change?
 

I want to know which model to be used for analysing the phase change phenomenon(like water ice changes to water liquid). The description is as follows i have a phase change material enclosed in a container and heat transfer fluid flows over it. I am interestd in knowing the volume fraction of liquid changed from ice over a period of time. Do i need to activate heat exhanger model. there are numerious solver (multiphase, solidification melting,species) Do i have to work on all these model simultaneously. plz guide me