Cluster-based reduced-order modeling to capture intermittent dynamics of interacting wakes

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

Abstract

Interacting flows are found in a range of aviation-relevant relevant technologies, including flow control devices, engine combustors and augmentors, aero-optics flow interactions, and aerodynamic control surfaces. A somewhat limited literature on interacting jets and wakes indicates that the structure and dynamics of these flowfields, including both large-scale coherent dynamics stemming from hydrodynamic instability and turbulent fluctuations, is fundamentally different from that of the single jet or single wake flowfield. In particular, the interacting flowfields experience variations in vortex shedding frequency and phase that change as the distance between the adjacent jets or wakes is varied. The goal of this work is to understand large-scale, intermittent dynamics of turbulent interacting wakes and jets using an improved reduced-order modeling strategy, cluster-based reduced-order modeling, to capture these dynamics. We compare the dynamics of a three-wake system at two spacings to that of a single wake flowfield using both proper orthogonal decomposition (POD) as well as the cluster-based method (CROM). The CROM is able to capture the expected dynamics of the single wake, and the results are analogous to those from POD. However, CROM reveals a much more complicated set of dynamics in the interacting wake cases, including the existence of two sets of dynamics that intermittently appear, that the POD was unable to detect. CROM is used to quantify these dynamics and understand the effect of bluff-body spacing on the three-wake flowfields.

Original languageEnglish (US)
Title of host publicationAIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
Edition210059
ISBN (Print)9781624105241
DOIs
StatePublished - Jan 1 2018
EventAIAA Aerospace Sciences Meeting, 2018 - Kissimmee, United States
Duration: Jan 8 2018Jan 12 2018

Publication series

NameAIAA Aerospace Sciences Meeting, 2018
Number210059

Other

OtherAIAA Aerospace Sciences Meeting, 2018
CountryUnited States
CityKissimmee
Period1/8/181/12/18

Fingerprint

Decomposition
Flow interactions
Control surfaces
Vortex shedding
Combustors
Flow control
Aviation
Optics
Aerodynamics
Hydrodynamics
Engines

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

Cite this

Dare, T. P., Berger, Z. P., Meehan, M., & O'Connor, J. A. (2018). Cluster-based reduced-order modeling to capture intermittent dynamics of interacting wakes. In AIAA Aerospace Sciences Meeting (210059 ed.). (AIAA Aerospace Sciences Meeting, 2018; No. 210059). American Institute of Aeronautics and Astronautics Inc, AIAA. https://doi.org/10.2514/6.2018-0340
Dare, Tyler Patrick ; Berger, Zachary P. ; Meehan, Mike ; O'Connor, Jacqueline Antonia. / Cluster-based reduced-order modeling to capture intermittent dynamics of interacting wakes. AIAA Aerospace Sciences Meeting. 210059. ed. American Institute of Aeronautics and Astronautics Inc, AIAA, 2018. (AIAA Aerospace Sciences Meeting, 2018; 210059).
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Dare, TP, Berger, ZP, Meehan, M & O'Connor, JA 2018, Cluster-based reduced-order modeling to capture intermittent dynamics of interacting wakes. in AIAA Aerospace Sciences Meeting. 210059 edn, AIAA Aerospace Sciences Meeting, 2018, no. 210059, American Institute of Aeronautics and Astronautics Inc, AIAA, AIAA Aerospace Sciences Meeting, 2018, Kissimmee, United States, 1/8/18. https://doi.org/10.2514/6.2018-0340

Cluster-based reduced-order modeling to capture intermittent dynamics of interacting wakes. / Dare, Tyler Patrick; Berger, Zachary P.; Meehan, Mike; O'Connor, Jacqueline Antonia.

AIAA Aerospace Sciences Meeting. 210059. ed. American Institute of Aeronautics and Astronautics Inc, AIAA, 2018. (AIAA Aerospace Sciences Meeting, 2018; No. 210059).

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

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AB - Interacting flows are found in a range of aviation-relevant relevant technologies, including flow control devices, engine combustors and augmentors, aero-optics flow interactions, and aerodynamic control surfaces. A somewhat limited literature on interacting jets and wakes indicates that the structure and dynamics of these flowfields, including both large-scale coherent dynamics stemming from hydrodynamic instability and turbulent fluctuations, is fundamentally different from that of the single jet or single wake flowfield. In particular, the interacting flowfields experience variations in vortex shedding frequency and phase that change as the distance between the adjacent jets or wakes is varied. The goal of this work is to understand large-scale, intermittent dynamics of turbulent interacting wakes and jets using an improved reduced-order modeling strategy, cluster-based reduced-order modeling, to capture these dynamics. We compare the dynamics of a three-wake system at two spacings to that of a single wake flowfield using both proper orthogonal decomposition (POD) as well as the cluster-based method (CROM). The CROM is able to capture the expected dynamics of the single wake, and the results are analogous to those from POD. However, CROM reveals a much more complicated set of dynamics in the interacting wake cases, including the existence of two sets of dynamics that intermittently appear, that the POD was unable to detect. CROM is used to quantify these dynamics and understand the effect of bluff-body spacing on the three-wake flowfields.

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Dare TP, Berger ZP, Meehan M, O'Connor JA. Cluster-based reduced-order modeling to capture intermittent dynamics of interacting wakes. In AIAA Aerospace Sciences Meeting. 210059 ed. American Institute of Aeronautics and Astronautics Inc, AIAA. 2018. (AIAA Aerospace Sciences Meeting, 2018; 210059). https://doi.org/10.2514/6.2018-0340