Publication:
Aeroelastic response of an elastically mounted 2-DOF airfoil and its gust-induced oscillations

cris.virtual.departmentStrömungsmechanik
cris.virtual.departmentStrömungsmechanik
cris.virtual.departmentbrowseStrömungsmechanik
cris.virtual.departmentbrowseStrömungsmechanik
cris.virtual.departmentbrowseStrömungsmechanik
cris.virtual.departmentbrowseStrömungsmechanik
cris.virtualsource.department874af3a3-9071-44b3-9fe6-bda0182c637d
cris.virtualsource.departmentba61e71a-d073-4609-89b6-c10b460b09a8
dc.contributor.authorBoulbrachene, Khaled
dc.contributor.authorBreuer, Michael
dc.date.issued2023-01
dc.description.abstractThe paper is concerned with numerical investigations on the effect of vertical wind gusts on airfoils in a parameter range relevant for Micro-Air Vehicles. Using a simplifiedsubstitute model instead of an elastic wing, a rigid but elastically mounted airfoil with two degrees of freedom (heave and pitch) is considered. The coupled problem is tackled by a partitioned fluid–structure interaction coupling scheme based on the large-eddy simulation (LES) technique and a rigid-body solver. In order to describe the effect of deterministic 1-cosine gusts of different gust lengths and gust strengths, the split velocity method (SVM) is incorporated into the simulation framework relying on the Arbitrary Lagrangian–Eulerian (ALE) formulation on temporally varying control volumes. First the flow fields and the corresponding aerodynamic forces during the direct airfoil–gust interaction are compared for a fixed and an elastically mounted airfoil. The intrinsic study on the elastic case includes nine different gust scenarios in the transitional Reynolds number regime in order to investigate the resulting flow fields and motion patterns and to answer the question whether limit-cycle oscillations (LCO) or even flutter can be induced. The results show that in seven of the studied cases, the airfoil–gust interaction leads to sustained heave and pitch oscillations of bounded amplitudes (i.e., LCO). Further investigations clarify that this can be physically attributed to the laminar separation taking place on the upper and lower surfaces of the airfoil. The two strongest gust cases, however, excite the airfoil to levels above its critical angle of attack and triggered a pitch-induced diverging flutter. An energy analysis of both characteristic scenarios (i.e., LCO and flutter) further elucidates the differences between both cases. The former case is driven by the heave motion, whereas the pitch DOF acts as an energy sink. Contrarily, in the case of flutter the pitching motion is powering the coupled system, whereas the heave motion dissipates energy.
dc.description.versionNA
dc.identifier.citationJournal of Fluids and Structures 117 (2023) 103828
dc.identifier.doi10.1016/j.jfluidstructs.2022.103828
dc.identifier.urihttps://openhsu.ub.hsu-hh.de/handle/10.24405/14682
dc.language.isoen
dc.publisherElsevier
dc.relation.journalJournal of Fluids and Structures
dc.relation.orgunitStrömungsmechanik
dc.relation.projectDFG-Projekt: BR 1847/17-1 Wind Gusts and their Dynamic Effects on Flexible Structures: Modeling and High-Resolution Simulations
dc.rights.accessRightsmetadata only access
dc.subjectWind gust
dc.subjectSplit velocity method
dc.subjectFluid–structure interaction (FSI)
dc.subject2-DOF aeroelastic oscillations
dc.subjectLimit-cycle oscillation (LCO)
dc.subjectAirfoil flutter
dc.subjectLarge-eddy simulation (LES)
dc.subjectEnergy analysis
dc.titleAeroelastic response of an elastically mounted 2-DOF airfoil and its gust-induced oscillations
dc.typeResearch article
dspace.entity.typePublication
hsu.peerReviewed
hsu.uniBibliography
oaire.citation.issue103828
oaire.citation.volume117
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