Leading-edge vortex burst on a low-aspect-ratio rotating flat plate

Medina, Albert; Jones, Anya R.

doi:10.1103/physrevfluids.1.044501

Cited by 38 publications

(22 citation statements)

References 43 publications

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“…This phenomenon is also in line with previous numerical and experimental observations at low Reynolds numbers (e.g. [16,17,18]). is also very complex and cannot be captured through VLM.…”

Section: Data Reductionsupporting

confidence: 93%

Numerical predictions of low Reynolds number compressible aerodynamics

Desert

Jardin

Bézard

et al. 2019

Aerospace Science and Technology

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Interest in low Reynolds number compressible flows is emerging due to prospective applications like flight on Mars and in the stratosphere. However, very little knowledge is available, both regarding the flow physics underlying this unique regime and the accuracy of numerical methods for its prediction. In this paper, low and high fidelity numerical approaches are compared with experimental measurements on both airfoils and rotors in the low Reynolds number compressible flow regime. It is shown that low fidelity approaches are suited to aerodynamic optimization despite high viscous and compressible effects. In addition, high fidelity approaches help reveal unique flow features of this regime.

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“…This phenomenon is also in line with previous numerical and experimental observations at low Reynolds numbers (e.g. [16,17,18]). is also very complex and cannot be captured through VLM.…”

Section: Data Reductionsupporting

confidence: 93%

Numerical predictions of low Reynolds number compressible aerodynamics

Desert

Jardin

Bézard

et al. 2019

Aerospace Science and Technology

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show abstract

“…This configuration is similar to that reported in Medina & Jones, 23 again with the exception they considered a 5% thickness wing and initiated the rotation using Eldredge's function. Figure 11 compares non-dimensional spanwise vorticity ω z c/V tip and velocity V zc / V tip flow fields obtained using Stereoscopic Particle Image Velocimetry (S-PIV) with those obtained using the present approach.…”

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confidence: 76%

Immersed Boundary Lattice Green Function methods for External Aerodynamics

Mengaldo

Liska

et al. 2017

23rd AIAA Computational Fluid Dynamics Conference

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In this paper, we document the capabilities of a novel numerical approach -the immersed boundary lattice Green's function (IBLGF)1 method -to simulate external incompressible flows over complex geometries. This new approach is built upon the immersed boundary method and lattice Green's functions to solve the incompressible Navier-Stokes equations. We show that the combination of these two concepts allows the construction of an efficient and robust numerical framework for the direct numerical and large-eddy simulation of external aerodynamic problems at moderate to high-Reynolds numbers.

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“…Spanwise velocity component of the tip vortex on the upper surface of the wing is here oriented inboard and opposes outboard velocity due to rotational effects and spanwise gradients in flow speed [4]. A detailed analysis of this mechanism is provided in [28] for an AR ¼ 2 wing with R 1 /c ¼ 0.5.…”

Section: Resultsmentioning

confidence: 99%

“…This cut then propagates towards the wing midspan as f increases, together with a global increase in the size of the outboard LEV. At some point, the outboard LEV that merges with the TV forms an outboard protuberance (f ¼ 508 and 608) that eventually bursts into small-scale structures (f ¼ 708) [28]. For f .…”

Section: Wings Revolving About Their Rootmentioning

confidence: 99%

On the lift-optimal aspect ratio of a revolving wing at low Reynolds number

Jardin

Colonius

2018

J. R. Soc. Interface.

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Lentink & Dickinson (2009 , 2705-2719. (doi:10.1242/jeb.022269)) showed that rotational acceleration stabilized the leading-edge vortex on revolving, low aspect ratio (AR) wings and hypothesized that a Rossby number of around 3, which is achieved during each half-stroke for a variety of hovering insects, seeds and birds, represents a convergent high-lift solution across a range of scales in nature. Subsequent work has verified that, in particular, the Coriolis acceleration plays a key role in LEV stabilization. Implicit in these results is that there exists an optimal AR for wings revolving about their root, because it is otherwise unclear why, apart from possible morphological reasons, the convergent solution would not occur for an even lower Rossby number. We perform direct numerical simulations of the flow past revolving wings where we vary the AR and Rossby numbers independently by displacing the wing root from the axis of rotation. We show that the optimal lift coefficient represents a compromise between competing trends with competing time scales where the coefficient of lift increases monotonically with AR, holding Rossby number constant, but decreases monotonically with Rossby number, when holding AR constant. For wings revolving about their root, this favours wings of AR between 3 and 4.

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Leading-edge vortex burst on a low-aspect-ratio rotating flat plate

Cited by 38 publications

References 43 publications

Numerical predictions of low Reynolds number compressible aerodynamics

Numerical predictions of low Reynolds number compressible aerodynamics

Immersed Boundary Lattice Green Function methods for External Aerodynamics

On the lift-optimal aspect ratio of a revolving wing at low Reynolds number

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