TY - GEN
T1 - Investigation of Interacting Wake Instability using Complex Network Analysis
AU - Dorer, Renee
AU - O’connor, Jacqueline
AU - Meehan, Michael
N1 - Publisher Copyright:
© 2023, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2023
Y1 - 2023
N2 - 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.
AB - 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.
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U2 - 10.2514/6.2023-2634
DO - 10.2514/6.2023-2634
M3 - Conference contribution
AN - SCOPUS:85200379922
SN - 9781624106996
T3 - AIAA SciTech Forum and Exposition, 2023
BT - AIAA SciTech Forum and Exposition, 2023
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - AIAA SciTech Forum and Exposition, 2023
Y2 - 23 January 2023 through 27 January 2023
ER -