[truffaldino]

I have recently found out about Implicit LES: The idea of the method is to use LES without subgrid model, i.e. run laminar simulation on a fine grid, which is much coarser than greeds used for DNS.

The justification of the method is based on the fact that energy of the eddies with space size less than l is proportional to l^2/3, so if our problem scale is L and the grid spacing is l, then the unaccounted eddies carry only (l/L)^2/3 part of the turbulent energy (see e.g; http://www.mit.edu/~auranga/presentations/Uranga_presentation-AIAA-2009-SanAntonio.pdf ).

Now, I would like to run flow around an airfoil at Re=50K, the characteristic size of the problem is the boundary layer thikness, which is relatively big at this Re:

Does it mean that I can run Implicit LES for a 3D airfoil, (which, e.g. can be laminar calculation in FLUENT) with grid spacing at foil surface of about 1/50 of the boundary layer size and get reliable results? (y+ for such spacing is order of 1 at this Re)?

People doing ILES claim that numerical error plays role of subgrid model. Will this work with traditional finite-volume schemes implimented in, say Fluent, or this methods needs special numeric schemes.