Maintenance of the Near-Wall Cycle of Turbulence for Hybrid RANS/LES of Fully-Developed Channel Flow
Abstract
Hybrid RANS/LES modeling of near-wall turbulence is investigated for fully-developed turbulent channel flow under very coarse resolution, a resolution not resolving the longitudinal eddies of the buffer layer in near-wall flow but not coarse enough to encompass an "effective" ensemble of eddies to give RANS. Without bursting from the buffer layer, the partially-resolved turbulence is suppressed. We model the effects of the buffer-layer eddies using a field of white noise and show that the core flow is able to extract energy from these artificial fluctuations to organize turbulence eddies that maintain a physical turbulence mixing. Results for Re% 640, based on the channel half-height and on the friction velocity, are presented. Mean-velocity and root-mean-square statistics are compared to results from higher resolution simulations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 2001
- Accession Number
- ADP013707
Entities
People
- Frank J. Zajaczkowski
- Leonard J. Peltier
Organizations
- Pennsylvania State University