[THA SEANGHAI]

Hello! I have read the ANSYS FLUENT Theory guide about 3 types of k-epsilon model, but I am still not sure, when do I need to use each type of k-epsilon model? I saw there are some differences between the two equation model of each type, but I cannot distinguish the different meaning of each one. Also I saw they are talking about the scale motion, that RNG can be accounted for the different scale of motion, but standard can be accounted for a specified scale, but I do not understand. They are standard k-epsilon model, RNG k-epsilon model, and Realizable k-epsilon model. Thank you in advanced!