Reaflow writes a file for every frame you need to make the simulation in order to see something.
http://www.realflow.com/te_resources.htm
Also you can read the manual,Reaflow its very easy to understant,very hard to control,thatīs why itīs sometimes a nightmare in production.
I already do something like this in an Fiat comercial , it takes a lot,first understand the basics
http://www.youtube.com/watch?v=LM-ORT4GqNg