Dynamics of commutator-errors in LES with non-uniform filter-width
Bos van der, Fedderik and Geurts, Bernard J. (2004) Dynamics of commutator-errors in LES with non-uniform filter-width. In: 5th International ERCOFTAC Workshop on Direct and Large-Eddy Simulation V, August 27-29, 2003, Munich, Germay.
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|Abstract:||In large-eddy simulation only the large scales in a turbulent flow are calculated explicitly and the small scales are effectively removed by the application of a filter with filter-width ∆. For LES of flows in complex geometries it is generally assumed that a non-uniform filter-width ∆(x) is advantageous. Application of non-uniform filters introduces additional sub-grid scale terms, referred to as commutator-errors. The commutator-error corresponds to filter-width variations along a flow-path and expresses differences in the local capturing of small scale flow-features. Therefore, a high correlation is expected between the specific filter-width non-uniformities and the production/dissipation of kinetic energy. This is confirmed by novel a priori analysis of turbulent mixing. In particular, commutator-errors arising from symmetric or non-symmetric filters are shown to differ considerably in dynamic implications.|
|Item Type:||Conference or Workshop Item|
|Copyright:||© 2004 Kluwer|
Electrical Engineering, Mathematics and Computer Science (EEMCS)
|Link to this item:||http://purl.utwente.nl/publications/48301|
|Export this item as:||BibTeX|
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