A framework for predicting accuracy limitations in large-eddy simulation

B.J. Geurts, J. Fröhlich

Research output: Contribution to journalArticleAcademicpeer-review

188 Citations (Scopus)
200 Downloads (Pure)

Abstract

The accuracy of large-eddy simulations is limited, among other things, by the quality of the subgrid parametrization and the numerical contamination of the smaller retained flow structures. We characterize the total simulation error in terms of the "subgrid-activity" s, which measures the relative turbulent dissipation rate (0?s?1) and the "subgrid resolution" r. This analysis is applied to turbulent mixing of a "Smagorinsky fluid" using a finite volume discretization of fourth order accuracy. On fixed coarse grids, i.e., at constant computational cost, the total simulation error decreases monotonically with filter width ? for large s while for smaller s the total error may even increase with decreasing ?. The corresponding modeling- and spatial discretization-error contributions are quantified at various resolutions.
Original languageEnglish
Pages (from-to)L41-L44
JournalPhysics of Fluids
Volume14
Issue number6
DOIs
Publication statusPublished - 2002

Fingerprint

Dive into the research topics of 'A framework for predicting accuracy limitations in large-eddy simulation'. Together they form a unique fingerprint.

Cite this