Evaluation of dynamics of fluttering and autorotation of a rigid plate in a flow using far-field method

Bakhshandehrostami, A; Fernandes, Antonio Carlos

doi:10.1007/s11071-018-4445-1

Cited by 1 publication

(2 citation statements)

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“…It reveals two distinctive, nearly-linear trends; one of them with a relatively large slope within a comparatively low Ca ∈ (0, 15), and the other with a mild slope within Ca ∈ (20, 70). These two tends merge within a relatively narrow matching interval Ca ∈ (15,20). Note the limiting case of α → 90 • as Ca → 0, which is an expected asymptotic behavior, and α →≈45 • for sufficiently large Ca.…”

Section: Resultsmentioning

confidence: 75%

“…Following work by Jin et al [19] showed that such autorotation is also possible under high incoming turbulence. Rostami and Fernandes [20] derived an analytical expression for the total moment applied on a rotating body into a flow current. They decomposed the total torque, rotational and mutual effects; the mutual component is refereed to the simultaneous contribution of the current velocity and the plate rotation.…”

Section: Introductionmentioning

confidence: 99%

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On the Dynamics of Flexible Plates under Rotational Motions

Jin

Kim

et al. 2018

Energies

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The reconfiguration of low-aspect-ratio flexible plates, required power and induced flow under pure rotation were experimentally inspected for various plate stiffness and angular velocities ω. Particle tracking velocimetry (PTV) and particle image velocimetry (PIV) were used to characterize the plate deformation along their span as well as the flow and turbulence statistics in the vicinity of the structures. Results show the characteristic role of stiffness and ω in modulating the structure reconfiguration, power required and induced flow. The inspected configurations allowed inspecting various plate deformations ranging from minor to extreme bending over 90∘ between the tangents of the two tips. Regardless of the case, the plates did not undergo noticeable deformation in the last ∼30% of the span. Location of the maximum deformation along the plate followed a trend s m ∝ l o g ( C a ) , where C a is the Cauchy number, which indicated that s m is roughly fixed at sufficiently large C a. The angle (α) between the plate in the vicinity of the tip and the tangential vector of the motions exhibited two distinctive, nearly-linear trends as a function of C a , within C a ∈ ( 0 , 15 ) and C a ∈ ( 20 , 70 ), with a matching within these C a at C a > 70, α ≈ 45 ∘. Induced flow revealed a local maximum of the turbulence levels at around 60% of the span of the plate; however, the largest turbulence enhancement occurred near the tip. Flexibility of the plate strongly modulated the spatial distribution of small-scale vortical structures; they were located along the plate wake in the stiffer plate and relatively concentrated near the tip in the low-stiffness plate. Due to relatively large deformation, rotational and wake effects, a simple formulation for predicting the mean reconfiguration showed offset; however, a bulk, constant factor on ω accounted for the offset between predictions and measurements at deformation reaching ∼ 60 ∘ between the tips.

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Section: Resultsmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%