Regularization modeling for LES of separated boundary layer flow

Share/Save/Bookmark

Geurts, B.J. (2008) Regularization modeling for LES of separated boundary layer flow. Journal of Fluids and Structures, 24 (8). pp. 1176-1184. ISSN 0889-9746

[img] PDF
Restricted to UT campus only
: Request a copy
1MB
Abstract:Regularization models for the turbulent stress tensor are applied to mixing and separated boundary layers. The Leray and the NS-a models in large-eddy simulation (LES) are compared to direct numerical simulation (DNS) and (dynamic) eddy-viscosity models. These regularization models are at least as accurate as the dynamic eddy-viscosity model, and can be derived from an underlying dynamic principle. This allows one to maintain central transport properties of the Navier-Stokes equations in the model and to extend systematically toward complex applications. The NS-a model accurately represents the small-scale variability, albeit at considerable resolution. The Leray model was found to be much more robust, allowing simulations at high Reynolds number. Leray simulations of a separated boundary layer are shown for the first time. The strongly localized transition to turbulence that arises under a blowing and suction region over a flat plate was captured accurately, quite comparable to the dynamic model. In contrast, results obtained with the Smagorinsky model, either with or without Van Driest damping, yield considerable errors, due to its excessive dissipation.
Item Type:Article
Copyright:© 2008 Elsevier
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:
Link to this item:http://purl.utwente.nl/publications/62648
Official URL:http://dx.doi.org/10.1016/j.jfluidstructs.2008.08.006
Export this item as:BibTeX
EndNote
HTML Citation
Reference Manager

 

Repository Staff Only: item control page

Metis ID: 255054