@inproceedings{dc1e5c504eb54041a15083fc7f6801b6,

title = "A coarse-grained LES model for turbulent channel flow",

abstract = "A hybrid RANS-LES method based on structural ensemble dynamics (SED) theory is presented, wherein coarse-grained turbulent fluctuation amplitudes are re-normalized using instantaneous values of an order function, i.e. mixing length, in the ensemble-averaged Navier-Stokes (EANS) equation. The re-normalization procedure is applied throughout the channel (at wall friction Reynolds numbers Reτ=1 050 and 2 000), to evade the common problem of log-layer mismatch. The mean and rms velocity profiles show improved agreement with DNS at very coarse grids (40×49×20 for both Re's). The method dissipates turbulent kinetic energy in the bulk flow, and increases turbulent fluctuations in the buffer region, mimicking the physical forcing of the sub-grid scale term. The results demonstrate the feasibility to reconstruct the unsteady effect of wall-bounded flows constrained by order functions.",

keywords = "channel, hybrid RANS/LES method, large eddy simulation, order functions, structural ensemble dynamics",

author = "N. Hu and H. Liu and She, {Z. S.} and F. Hussain",

year = "2011",

doi = "10.1063/1.3651835",

language = "English",

isbn = "9780735409361",

series = "AIP Conference Proceedings",

pages = "61--65",

booktitle = "Recent Progresses in Fluid Dynamics Research - Proceedings of the Sixth International Conference on Fluid Mechanics, ICFM VI",

note = "null ; Conference date: 30-06-2011 Through 03-07-2011",

}