Noncirculatory Fluid Forces on Panels with Porosity Gradients

Hajian, Rozhin; Jaworski, Justin

doi:10.2514/1.j057269

Cited by 6 publications

(2 citation statements)

References 28 publications

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“…This acoustic-aerodynamic tradeoff has motivated recent analytical investigations by Iosilevskii (2011Iosilevskii ( , 2013 to predict the fluid forces on airfoils in steady flow that have finite trailing-edge regions of uniform porosity. Hajian & Jaworski (2017) generalized this result and determined in closed form the aerodynamic loads on an airfoil with any Hölder-continuous porosity distribution, which may be further extended for unsteady motions (Hajian & Jaworski 2019). Numerical aeroacoustic solvers, such as those developed by Cavalieri et al ( 2016) and Pimenta et al (2018), now permit the acoustic effects of porous wing planforms and other effects such as wing elasticity.…”

Section: Porosity Of Aerodynamic Planforms and Edgesmentioning

confidence: 97%

Aeroacoustics of Silent Owl Flight

Jaworski

Peake

2020

Annu. Rev. Fluid Mech.

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The ability of some species of owl to fly in effective silence is unique among birds and provides a distinct hunting advantage, but it remains a mystery as to exactly what aspects of the owl and its flight are responsible for this dramatic noise reduction. Crucially, this mystery extends to how the flow physics may be leveraged to generate noise-reduction strategies for wider technological application. We review current knowledge of aerodynamic noise from owls, ranging from live owl noise measurements to mathematical modeling and experiments focused on how owls may disrupt the standard routes of noise generation. Specialized adaptations and foraging strategies are not uniform across all owl species: Some species may not have need for silent flight, or their evolutionary adaptations may not be effective for useful noise reduction for certain species. This hypothesis is examined using mathematical models and borne out where possible by noise measurements and morphological observations of owl feathers and wings.

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Section: Porosity Of Aerodynamic Planforms and Edgesmentioning

confidence: 97%

Aeroacoustics of Silent Owl Flight

Jaworski

Peake

2020

Annu. Rev. Fluid Mech.

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“…With the goal to assess these aerodynamic effects, Hajian & Jaworski (2017) developed an analytic formulation and solution for the steady aerodynamic loads on aerofoils with arbitrary, realistic (specifically, Hölder continuous) porosity distributions to investigate the impact of a chordwise variation in porosity. This analysis was later extended to determine the unsteady forces on an arbitrarily deforming panel with generalised porosity distributions (Hajian & Jaworski 2019). An analytical expression for the unsteady pressure distribution was presented and evaluated for the special cases of uniform and variable-porosity panels undergoing harmonic deformations, where the effect of the panel end conditions was also investigated.…”

Section: Introductionmentioning

confidence: 99%