Phase-based analysis and control of low Reynolds number aeroelastic flows
Fuente:
arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Accesso online: | |
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| _version_ | 1866918247206486016 |
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| author | Sumanasiri, Chathura R. Sahu, Tulsi Ram Nair, Aditya G. |
| author_facet | Sumanasiri, Chathura R. Sahu, Tulsi Ram Nair, Aditya G. |
| contents | Flutter in lightweight airfoils under unsteady flows presents a critical challenge in aeroelastic stability and control. This study uncovers phase-localized mechanisms that drive the onset and suppression of flutter in a freely pitching airfoil at low Reynolds number. By introducing targeted impulsive stiffness perturbations, we identify critical phases that trigger instability. Using phase-sensitivity functions, energy-transfer metrics, and dynamic mode decomposition, we show that flutter arises from phase lock-on between structural and fluid modes. Leveraging this insight, we design an energy-optimal, phase-based control strategy that applies transient heaving motions to disrupt synchronization and arrest unstable growth. This minimal, time-localized control suppresses subharmonic amplification and restores stable periodic motion. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_00306 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Phase-based analysis and control of low Reynolds number aeroelastic flows Sumanasiri, Chathura R. Sahu, Tulsi Ram Nair, Aditya G. Fluid Dynamics Flutter in lightweight airfoils under unsteady flows presents a critical challenge in aeroelastic stability and control. This study uncovers phase-localized mechanisms that drive the onset and suppression of flutter in a freely pitching airfoil at low Reynolds number. By introducing targeted impulsive stiffness perturbations, we identify critical phases that trigger instability. Using phase-sensitivity functions, energy-transfer metrics, and dynamic mode decomposition, we show that flutter arises from phase lock-on between structural and fluid modes. Leveraging this insight, we design an energy-optimal, phase-based control strategy that applies transient heaving motions to disrupt synchronization and arrest unstable growth. This minimal, time-localized control suppresses subharmonic amplification and restores stable periodic motion. |
| title | Phase-based analysis and control of low Reynolds number aeroelastic flows |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2506.00306 |