[lakeat]

I noticed in programmers guide,
3.2 Steady turbulent flow over a backward-facing step.
So, my questions are
1. What if I use turbfoam instead of simplefoam?
2. How can turbulence be steady? what is steady turbulence?

Another two questions are
3. Can I use turbfoam to solve a laminar case, what will it happen?
4. Since Rans like turbFoam.c also contain the d/dt, so concerning the information we get from both RANS and LES, what's the differences between them?

Any reply is appreciated.

Daniel