CFL number and time accuracy for LES

Li Yang

Dear all,

I am now doing LES using SIMPLE based solver. I use the Crank-Nicolson scheme in time and the central difference scheme in space. I would like to use the fully implicit scheme in time as well.

My questions are: (1) Which scheme would allow me to use a larger CFL number and how large a CFL number you normally used? (2) How do I know my solution is time accurate ?

Thank you very much in advance.

Li