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Article


Title

Recursive Dynamic Mode Decomposition for the flow around two square cylinders in tandem configuration

Authors

[ 1 ] Instytut Mechaniki Stosowanej, Wydział Inżynierii Mechanicznej, Politechnika Poznańska | [ P ] employee

Scientific discipline (Law 2.0)

[2.8] Mechanical engineering

Year of publication

2022

Published in

Journal of Fluids and Structures

Journal year: 2022 | Journal volume: vol. 110

Article type

scientific article

Publication language

english

Keywords
EN
  • Proper Orthogonal Decomposition
  • Dynamic Mode Decomposition
  • Reduced-order modelling
  • ROM
  • Modal decomposition
  • Wake flow
Abstract

EN A recent approach in modelling coherent structures in fluid flows, called Recursive Dynamic Mode Decomposition, is presented on the example of the flow around two square cylinders, where interactions between the wakes occur. The distance between cylinders varies from one to five side lengths of the square, leading to different behaviour of the wake flow. The proposed method is based on the recursive repeating of a three-step procedure: computation of the DMD mode basis, selection of the mode minimizing the defined residual error, and, finally, purging this mode from the flow (the snapshots). RDMD combines the advantages of Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD). Low residual error, characteristic of POD, and purer frequency content observed in DMD, make this method especially applicable in unsupervised machine learning-based applications, including machine learning control (MLC) of the flows with few dominant frequencies (Brunton and Noack, 2015).

Date of online publication

12.02.2022

Pages (from - to)

103515-1 - 103515-30

DOI

10.1016/j.jfluidstructs.2022.103515

URL

https://www.sciencedirect.com/science/article/pii/S0889974622000093?via%3Dihub

Comments

Article Number: 103515

Points of MNiSW / journal

140.0

Impact Factor

2.917 [List 2020]

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