Evaluation of potential flow models for unsteady separated flow with respect to experimental data

Manar, Field; Jones, Anya R.

doi:10.1103/physrevfluids.4.034702

Cited by 21 publications

(12 citation statements)

References 81 publications

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Section: Resultsmentioning

confidence: 95%

“…The vortices then convect with the local velocity field, and a new set of vortices is shed from the plate at the next time step. This procedure is similar to the low-order, inviscid vortex methods described by Spalart (1988) and Manar & Jones (2019). Figure 13 plots the total circulation produced at the leading edge of the wing for the panel method (solid blue line) and the CFD simulations (solid green line, with white circles) at three representative radial stations.…”

Section: Discussionmentioning

confidence: 92%

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The role of rotary motion on vortices in reverse flow

et al. 2019

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The physics of a rotary wing in forward flight are highly complex, particularly when flow separation is involved. The purpose of this work is to assess the role of three-dimensional (3-D) vortex dynamics, with a focus on Coriolis forces, in the evolution of vortices in the reverse flow region of a rotating wing. High-fidelity numerical simulations were performed to recreate the flow about a representative rotating wing in forward flight. A vorticity transport analysis was performed to quantify and compare the magnitudes of 2-D flow physics, vortex tilting and Coriolis effects in the resulting flow fields. Three-dimensional vortex dynamics was found to have a very small impact on the growth and behaviour of vortices in the reverse flow region; in fact, the rate of vortex growth was successfully modelled using a simple 2-D vortex method. The small role of 3-D physics was attributed to the Coriolis and vortex tilting terms being approximately equal and opposite to one another. This ultimately lead to vortex behaviour that more closely resembled a surging wing as opposed to a conventional rotating wing, a feature unique to the reverse flow region.

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Section: Resultsmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 92%

The role of rotary motion on vortices in reverse flow

et al. 2019

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“…This apparatus is connected via two control rods to a magnetic track and gantry. The presence of the mounting apparatus, together with the finite aspect ratio of the wing, means that the flow will not be entirely two dimensional; however, force and flow field measurements in the same test facility have compared well with strictly two-dimensional (2-D) models of attached (Kirk & Jones 2018) and separated flows (Manar & Jones 2019). These past results suggest that three-dimensionality, while certainly present, is expected to have a small impact on the large-scale flow structures studied in the current experiments.…”

Section: Methodsmentioning

confidence: 99%

“…The leading-edge vortex (LEV) is one such vortical structure that causes significant discrepancies in force production compared to conventional aerodynamic theories (Eldredge & Jones 2019). The LEV has been investigated at length in a number of fundamental studies regarding surging, pitching and rotating flat plates (Ellington et al 1996;Birch & Dickinson 2001;Kriegseis, Kinzel & Rival 2013;Mancini et al 2015;Panah, Akkala & Buchholz 2015;Manar 2018), and its growth has been successfully modelled for cases where the timing of vortex formation is known beforehand (Wang & Eldridge 2013;Wong & Rival 2015;Manar & Jones 2019). In more realistic flows, however, the question of when flow separation occurs becomes a driving factor in understanding LEV formation.…”

Section: Introductionmentioning

confidence: 99%

“…1996; Birch & Dickinson 2001; Kriegseis, Kinzel & Rival 2013; Mancini et al. 2015; Panah, Akkala & Buchholz 2015; Manar 2018), and its growth has been successfully modelled for cases where the timing of vortex formation is known beforehand (Wang & Eldridge 2013; Wong & Rival 2015; Manar & Jones 2019). In more realistic flows, however, the question of when flow separation occurs becomes a driving factor in understanding LEV formation.…”

Section: Introductionmentioning

confidence: 99%

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