RANS results for LES

Li Yang

Dear all,

RE: Can I use the unsteady RANS result as an initial solution for LES?

I am trying to do LES with a SIMPLE based method code. For RANS calculation, I usually use the fully implicit scheme in time and the hybrid scheme in space, hence I could use very large time step and get the results quickly. However, for LES simulation, I was told that I will have to use the Crank-Nicolson scheme in time and the central difference scheme in space. I find that I can only use very small time step. My question is: can I use the unsteady RANS solution as an initial input for my LES simulation ? By doing this, can I get a LES solution much quicker ?

Thank you very much for your reply in advance.

Li