Flow Development on a Flat-Plate Wing Subjected to a Streamwise Acceleration

Mülleners, Karen; Mancini, Peter; Jones, Anya R.

doi:10.2514/1.j055497

Cited by 31 publications

(28 citation statements)

References 21 publications

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“…Over the past few decades, substantial studies have been dedicated to the understanding of post-stall flows over finite-aspect-ratio wings (Winkelmann et al. 1980; Taira & Colonius 2009; Mulleners, Mancini & Jones 2017; Eldredge & Jones 2019; Zhang et al. 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Separated flows over lifting surfaces have been studied extensively due to their critical importance in aerodynamics and hydrodynamics. Over the past few decades, substantial studies have been dedicated to the understanding of post-stall flows over finite-aspect-ratio wings (Winkelmann et al 1980;Taira & Colonius 2009;Mulleners, Mancini & Jones 2017;Eldredge & Jones 2019;Zhang et al 2020). For a steadily translating wing, the vortices generated from the leading and trailing edges exhibit complex nonlinear evolution under the influence of the tip vortices.…”

Section: Introductionmentioning

confidence: 99%

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Laminar separated flows over finite-aspect-ratio swept wings

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laminar separated flows over finite-aspect-ratio swept wings

et al. 2020

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“…Recently Fernando et al [10] and Mulleners et al [11] used surging motions to simulate a streamwise gust. In a streamwise gust, the differences between a moving-model and a moving-fluid case can be resolved by adding/subtracting buoyancy and added-mass forces as done by Granlund et al [12].…”

Section: Introductionmentioning

confidence: 99%

Modeling Transverse Gusts Using Pitching, Plunging, and Surging Airfoil Motions

et al. 2018

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Three model-motions were developed to replicate the aerodynamic response of a transverse gust. These motions included a pure-plunging and two three degree-of-freedom motions that approximated the angle-of-attack distribution produced by the gust. Using inviscid models and viscous flow simulations, the response of the gust and model-motions were compared as a function of the non-dimensional reduced frequency. The inviscid model was found to overestimate the influence of the rotational added-mass in the three degree-of-freedom motions. In contrast, the viscous flow simulations showed that the two primary sources of discrepancy between the gust and model-motions lie in the non-linear angle-of-attack distribution caused

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“…These flows are typically massively separated and involve leading-edge vortex (LEV) formation and shedding. Finite-wing effects in these regimes, specifically concerning the interactions of tip vortices with leading-and trailing-edge vortices, have been investigated using CFD and experiments, for translating wings [20,38,43], pitching wings [26,32,34,63,70,72], plunging wings [8][9][10]23,66,71], rotating wings [3,14,15,41,47,62] and wings subject to gusts [4,17,48]. These studies have shed much light on force production in unsteady finite-wings and on the contributions from circulatory, apparent mass and vortical effects.…”

Section: Introductionmentioning

confidence: 99%

Unsteady lifting-line theory and the influence of wake vorticity on aerodynamic loads

Bird

Ramesh

2021

Theor. Comput. Fluid Dyn.

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Frequency-domain unsteady lifting-line theory (ULLT) provides a means by which the aerodynamics of oscillating wings may be studied at low computational cost without neglecting the interacting effects of aspect ratio and oscillation frequency. Renewed interest in the method has drawn attention to several uncertainties however. Firstly, to what extent is ULLT practically useful for rectangular wings, despite theoretical limitations? And secondly, to what extent is a complicated wake model needed in the outer solution for good accuracy? This paper aims to answer these questions by presenting a complete ULLT based on the work of Sclavounos, along with a novel ULLT that considers only the streamwise vorticity and a Prandtl-like pseudosteady ULLT. These are compared to Euler CFD for cases of rectangular wings at multiple aspect ratios and oscillation frequencies. The results of this work establish ULLT as a low computational cost model capable of accounting for interacting finite-wing and oscillation frequency effects and identify the aspect ratio and frequency regimes where the three ULLTs are most accurate. This research paves the way towards the construction of time-domain or numerical ULLTs which may be augmented to account for nonlinearities such as flow separation.

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Flow Development on a Flat-Plate Wing Subjected to a Streamwise Acceleration

Cited by 31 publications

References 21 publications

Laminar separated flows over finite-aspect-ratio swept wings

Laminar separated flows over finite-aspect-ratio swept wings

Modeling Transverse Gusts Using Pitching, Plunging, and Surging Airfoil Motions

Unsteady lifting-line theory and the influence of wake vorticity on aerodynamic loads

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