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Unsteady evolution of a trailing vortex subject to time-varying inflow boundary conditions
Citation Link: https://doi.org/10.15480/882.9348
Publikationstyp
Conference Paper
Date Issued
2024-04-04
Sprache
English
Author(s)
Lehigh University, Bethlehem, PA
Virginia Polytechnic Institute and State University, Blacksburg, VA
TORE-DOI
Start Page
437
End Page
445
Citation
8th International Symposium on Marine Propulsors (smp 2024)
Contribution to Conference
Publisher
Norwegian University of Science and Technology, Department of Marine Technology
ISBN
978-82-691120-5-4
Peer Reviewed
true
A Batchelor vortex is prescribed as an inflow boundary condition for high-fidelity fluid dynamics simulations to investigate the influence of upstream vortex motions on the vortex evolution downstream. This configuration emulates the unsteady motions of a lifting surface that induce small perturbations to the initial state of a trailing vortex and can evolve into large three-dimensional deformations downstream. The computational campaign characterizes the downstream evolution of a canonical trailing vortex model subject to low-amplitude periodic oscillations of the center position over a range of Strouhal numbers. Periodic oscillations of the vortex center position in one or two simultaneous directions introduce curvature to the trailing vortex system, whose self-induced rotation creates nonplanar sinusoidal deformations of the vortex in the streamwise direction at long times that deviate from the wellknown planar rotation of linear theory. Phase snapshots of this canonical streamwise vortex configuration prescribed harmonically at the inflow boundary are expected to elucidate the unsteady character of a real trailing vortex generated by a propellor or control surface in the absence of wake effects. Growth of the vortex perturbation amplitude is not observed in the present computations, in contrast to available experimental data, which suggests that pure translational motions of a single vortex are not sufficient to excite perturbation amplitude growth.
Subjects
vortex dynamics
DDC Class
530: Physics
620: Engineering
Publication version
publishedVersion
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Name
Herndon-UnsteadyEvolutionOfATrailingVortexSubjectToTimevaryingInflowBoun-1168-1-final.pdf
Type
Main Article
Size
3.1 MB
Format
Adobe PDF