Journal
FLUID DYNAMICS RESEARCH
Volume 50, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1873-7005/aab2f1
Keywords
DMD; HODMD; flow structures; cylinder wake
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Funding
- Spanish Ministry of Economy and Competitiveness [TRA2016-75075-R]
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A new method to analyze spatio-temporal flow structures is presented. It consists on applying a higher order dynamic mode decomposition sequentially, in time and space. The method is successfully applied to analyze the three-dimensional wake of a circular cylinder. The results obtained are in good agreement with their counterparts predicted by the linear theory (Floquet stability analysis), although the data analyzed are nonlinear. This sequential spatio-temporal method provides a more detailed description of the flow physics, since the dominant frequencies, wavenumbers and their harmonics are accurately calculated. This method is a promising tool, suitable to uncover spatio-temporal flow structures that could be used to study global instabilities in complex nonlinear flows.
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