Investigation of Interacting Wake Instability using Complex Network Analysis

Renee Dorer, Jacqueline O’connor, Michael Meehan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The dynamics of interacting wakes is explored using a suite of analytical tools to understand variations in the wake-shedding instability as a function of wake spacing. We use three tools in tandem – wavelet transforms, spectral proper orthogonal decomposition, and complex network analysis – to further investigate the dynamical behavior of a three-wake system as compared to a single-wake system. The use of wavelet decompositions allows for a measure of the intermittency in the coherent dynamics of the flow, where the three-wake system displays significantly more intermittency than the single-wake system. The level of intermittency in wake shedding of each individual wake is strongly dependent on the spacing between the wakes, where the dynamics of the central wake are most sensitive to the spacing. Spectral proper orthogonal decomposition and complex network analysis are used together to identify the modal dynamics of the flow as well as the wavemaker regions that drive the oscillations. Analysis shows that the two outer wakes display stronger oscillations than the central wake for most spacings, except where the wakes are strongly merged at the closest spacing. Additionally, the coherence and connectedness of the shear layer oscillations are greater in the three-wake cases, according to the network analysis, as compared to the single-wake configuration.

Original languageEnglish (US)
Title of host publicationAIAA SciTech Forum and Exposition, 2023
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624106996
DOIs
StatePublished - 2023
EventAIAA SciTech Forum and Exposition, 2023 - Orlando, United States
Duration: Jan 23 2023Jan 27 2023

Publication series

NameAIAA SciTech Forum and Exposition, 2023

Conference

ConferenceAIAA SciTech Forum and Exposition, 2023
Country/TerritoryUnited States
CityOrlando
Period1/23/231/27/23

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

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