Article
Diving Deep into Flow Patterns: A Higher-Order DMD Analysis of Porous Coated Cylinders (en)
* Presenting author
Abstract:
This study delves deep into the application of Higher-Order Dynamic Mode Decomposition (HODMD) with a specific focus on porous cylindrical structures. The primary objective is to rigorously assess how HODMD performs in the context of transient external flow simulations involving these porous cylindrical geometries, which are very well studied in noise control. The flow simulations are carried out at Reynolds number of 127,000. The primary analysis aims to pinpoint the most prominent flow dynamic structures and their associated decomposed modes, including their prevailing frequencies. To bolster the accuracy of the results, the algorithm is integrated with Singular Value Decomposition (SVD) along with advanced data processing techniques. Consequently, it sheds light on the effectiveness and reliability of HODMD in studying complex external flow phenomena within porous cylindrical setups. Furthermore, in the context of porous coatings with low airflow resistivity, the thickness of the porous region has a substantial impact on the generation of vortices behind the cylinders. By employing Dynamic Mode Decomposition (DMD), we can discern various modes that govern the flow patterns behind the cylinder. The primary outcome is the development of a reduced-order model based on DMD, which simplifies the original flow for improved understanding and analysis.