Compute Canada

View All Papers
To Submit a new publication, Please visit the User's Section (logged in users only)

Publications:
To view a publication's Abstract (if available), click on publication's title
Author(s)
     Ugo Piomelli, Carlo Scalo
Title
     Subgrid-scale modelling in relaminarizing flows
Publication Name
     Fluid Dyn. Res.
Publication Type
     Journal
Publisher
     
Place
     
Editor(s)
     
Number
     
School
     
Volume
      42
Chapter
     
Pages
      045510
Other Publication Information
     
Publication Year
     2010
Abstract
     The reversion of a turbulent flow to a laminar or quasi-laminar state may take very different paths, depending on the cause of the relaminarization; modelling these flows is quite difficult. Large-eddy simulations (LES) may be quite effective as the large, momentum-carrying eddies are accurately resolved; the unresolved, subgrid-scale (SGS) stresses, however, may still play an important role. We report here the results of an a priori analysis of the behaviour of the SGS stresses in two relaminarizing flows: a plane channel subjected to spanwise rotation, and a boundary layer subjected to a strong favourable pressure gradient resulting in freestream acceleration. The a priori test results are accompanied by actual LES, which highlight the effect of grid resolution and modelling errors on the dynamics of the relaminarization. Dynamic SGS models predict the overall features of the relaminarization correctly, although some of the details are not captured. At the levels of grid refinement used, however, the SGS contribution to momentum transport is very small, and little difference is observed between the results obtained with the various models.
Keywords
     
Website
     http://stacks.iop.org/FDR/42/045510
Paper Status
     Published
DOI / Publication ID
     hpcg1246



View All Papers