Investigation of wall-bounded turbulent flow using Dynamic mode decomposition

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Dynamics mode decomposition (DMD) which is a method to construct a linear mapping describing the dynamics of a given time-series of any quantities is applied to the analysis of a turbulent channel flow. The flow fields are generated by direct numerical simulations for the friction Reynolds number Re τ = 190. The time-series of the flow fields in a short time-interval in the order of the wall-unit time-scale and in a small spatial domain that encloses a single near-wall structure are used as the inputs to DMD. In some datasets, linearly growing modes that seem to contribute to the well-known self-sustained cycle of the flow structures near the wall are detected.

Original languageEnglish
Article number042040
Number of pages5
JournalJournal of Physics: Conference Series
Issue numberSECTION 4
Publication statusPublished - 2011

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