Gust mitigation with an oscillating airfoil at low Reynolds number
| dc.contributor.author | Poudel, Naresh | |
| dc.contributor.author | Yu, Meilin | |
| dc.contributor.author | Hrynuk, John T. | |
| dc.date.accessioned | 2021-11-10T19:05:27Z | |
| dc.date.available | 2021-11-10T19:05:27Z | |
| dc.date.issued | 2021-10-19 | |
| dc.description.abstract | The encounter between micro-aerial vehicles (MAVs) and gusts is often detrimental and mitigating the effects of the gust is important for operating MAVs under severe environmental conditions. This study investigates the impact of vertical gusts on stationary and oscillating NACA0012 (National Advisory Committee for Aeronautics) airfoils at low Reynolds numbers using high-order computational fluid dynamics methods, and identifies key dynamics that dominate gust mitigation. The interaction of the gusts with the stationary airfoil generates large unsteady forces, which exceed the peak static lift coefficient. A simple pitch-down maneuver and oscillating airfoil motion were tested as methods for mitigating the effects of the gusts. A rapid and significant pitch-down maneuver is observed to inadvertently cause a stall event by exceeding the negative stall angle. A stepwise change in the angle of attack (AoA), as the gust develops, is shown to be more effective at mitigating the gust effect. However, this gust mitigation strategy is still not effective if the gust continues to grow in magnitude. Low amplitude wing oscillations were then tested as a novel method for gust mitigation. Increasing the reduced frequency of the oscillating airfoil is shown to dominate the gust and results in a predictable oscillatory lift and drag/thrust behavior. Results also show that this effect is relatively insensitive to variations in the Strouhal number. These results suggest there may be gust mitigation strategies leveraging oscillating wing behaviors on MAVs. | en_US |
| dc.description.sponsorship | This research was sponsored by the Army Research Laboratory and was accomplished under Cooperative Agreement No. W911NF-20–2-0028. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein. The hardware used in the computational studies is part of the UMBC High Performance Computing Facility (HPCF). The facility is supported by the U.S. National Science Foundation through the MRI program (Grant Nos. CNS-0821258, CNS1228778, and OAC-1726023) and the SCREMS program (Grant No. DMS-0821311), with additional substantial support from the University of Maryland, Baltimore County (UMBC). | en_US |
| dc.description.uri | https://aip.scitation.org/doi/10.1063/5.0065234?af=R&feed=most-recent | en_US |
| dc.format.extent | 16 pages | en_US |
| dc.genre | journal articles | en_US |
| dc.identifier | doi:10.13016/m2tqkv-uxoh | |
| dc.identifier.citation | Poudel, Naresh; Yu, Meilin; Hrynuk, John T.; Gust mitigation with an oscillating airfoil at low Reynolds number; Physics of Fluids 33, 101905, 19 October, 2021; https://doi.org/10.1063/5.0065234 | en_US |
| dc.identifier.uri | https://doi.org/10.1063/5.0065234 | |
| dc.identifier.uri | http://hdl.handle.net/11603/23308 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | AIP Publishing | en_US |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Mechanical Engineering Department Collection | |
| dc.relation.ispartof | UMBC Student Collection | |
| dc.relation.ispartof | UMBC Faculty Collection | |
| dc.rights | This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author. | en_US |
| dc.rights | Public Domain Mark 1.0 | * |
| dc.rights | This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law. | |
| dc.rights.uri | http://creativecommons.org/publicdomain/mark/1.0/ | * |
| dc.subject | UMBC High Performance Computing Facility (HPCF) | |
| dc.title | Gust mitigation with an oscillating airfoil at low Reynolds number | en_US |
| dc.type | Text | en_US |
| dcterms.creator | https://orcid.org/0000-0002-8543-6019 | en_US |
| dcterms.creator | https://orcid.org/0000-0003-3071-0487 | en_US |