[rkadlof]

Hello,

I learn Ansys Fluent on my own. Read PDF's book etc. However I cannot find the simple answer for few questions.
I understand the ideas of RANS, DNS, LES methods, but (maybe it is a stupid question)

1. How do I know which one method is running during computation? Does it depend on eq. turbulence model? mesh size? There is somewhere kinda option to switch on eg. LES instead of RANS?

2. Second question, I am going to do simulation of PDE, RDE, or pulsejet in fluent. How to represent the valves (open-close), do i need to make the UDF with eq. function "if pressure <1atm blabla" or is that possible to achieve by creating dynamic mesh?

I hope it is clear enough to understand.
Thank you for attention ;-)
R.