Modification of modal characteristics in the wakes of blockages of square cylinders with multi-scale porosity

Higham, JE ORCID: 0000-0001-7577-0913 and Vaidheeswaran, A (2022) Modification of modal characteristics in the wakes of blockages of square cylinders with multi-scale porosity. PHYSICS OF FLUIDS, 34 (2). 025114-025114.

Access the full-text of this item by clicking on the Open Access link.

Official URL: http://dx.doi.org/10.1063/5.0078437

Abstract

<jats:p>We present our study on flows past porous obstacles, which exhibit complex nonlinear dynamics. Regions in the near-wake host multiple modes of hydrodynamic instabilities, which interact with the bleed flow from the trailing edge. As a result, the developing shear layers weaken and the wakes protract. The dynamics are largely altered by the configuration of patches even when the plan porosities are similar. We describe wake turbulence using conventional statistics and modal decomposition techniques. Proper orthogonal decomposition (POD) identifies energetic events containing relevant scales of motion, while dynamic mode decomposition (DMD) isolates frequency-locked modes. Finally, wake signatures from the first two iterations are characterized by cross-examining POD and DMD supports.</jats:p>

Item Type:	Article
Uncontrolled Keywords:	Pediatric, Rare Diseases
Divisions:	Faculty of Science and Engineering > School of Environmental Sciences
Depositing User:	Symplectic Admin
Date Deposited:	24 Feb 2022 15:56
Last Modified:	15 Mar 2024 14:56
DOI:	10.1063/5.0078437
Open Access URL:	https://doi.org/10.1063/5.0078437
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3149611