LES Near-Wall Velocity Profile

Alex May

Dear all,

Has anyone previously investigated the mean velocity profile in the near wall region of a flow using the Fluent LES turbulence model?

I have investigated various flows in square cross-section ducts at Reynolds numbers ranging from around 16,000 to 83,000, in each case with meshes meeting best practice guidelines (y+ order 1 etc). In each case I have found that the laminar sublayer law of the wall (u+ = y+) is not obeyed in the region of y+ from 1 to 10 apart from at the first node from the wall - as a result although the skin friction turns out to be reasonable accurate, the velocity profile is incorrect.

Has anyone observed the same phenomenon or better still actually got correct near wall velocity profile results from Fluent LES code?

Many thanks in advance,

Alex May