Recursive Dynamic Mode Decomposition for the flow around two square cylinders in tandem configuration
[ 1 ] Instytut Mechaniki Stosowanej, Wydział Inżynierii Mechanicznej, Politechnika Poznańska | [ P ] pracownik
2022
artykuł naukowy
angielski
- Proper Orthogonal Decomposition
- Dynamic Mode Decomposition
- Reduced-order modelling
- ROM
- Modal decomposition
- Wake flow
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).
12.02.2022
103515-1 - 103515-30
Article Number: 103515
140
3,6