Dynamic mode decomposition analysis of coherent structures in rotating plane Couette flow

Francesco Sacco*, Rodolfo Ostilla-Mónico, Roberto Verzicco

*Corresponding author for this work

Research output: Contribution to journalConference articleAcademicpeer-review

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Abstract

Large scale structures have been observed in many turbulent wall bounded flows, such as pipe, Couette or square duct flows. Many efforts have been made in order to capture such structures to understand and model them. However, commonly used methods have their limitations, such as arbitrariness in parameter choice or specificity to certain setups. In this manuscript we attempt to overcome these limitations by using two variants of Dynamic Mode Decomposition (DMD). We apply these methods to (rotating) Plane Couette flow, and verify that DMD-based methods are adequate to detect the coherent structures and to extract the distinct properties arising from different control parameters. In particular, these DMD variants are able to capture the influence of rotation on large-scale structures by coupling velocity components. We also show how high-order DMD methods are able to capture some complex temporal dynamics of the large-scale structures. These results show that DMD-based methods are a promising way of filtering and analysing wall bounded flows.

Original languageEnglish
Article number012012
JournalJournal of physics: Conference series
Volume1522
Issue number1
DOIs
Publication statusPublished - 10 Jun 2020
Event4th Madrid Summer School on Turbulence 2019 - Madrid, Spain
Duration: 10 Jun 201912 Jul 2019
Conference number: 4

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